Why do tomato seedlings turn yellow after picking? Why do the leaves of tomato seedlings turn yellow and what to do?

The key component of any plant is chlorophyll. Thanks to it, a vital connection is carried out between the sun and the biosphere: chlorophyll contained in plant cells, under the influence sun rays synthesizes from water and carbon dioxide organic substances. Yellowing of plants indicates a violation of the formation of chlorophyll in them - a disease called chlorosis. So the answer to the question of why tomato seedlings turn yellow is quite simple. But this alone is not enough - we need to get to the reasons. And there are several of them.

The most common of them is malnutrition of the root system. This happens due to its damage, physical or thermal (hypothermia). But if it's broken temperature regime, chlorosis affects the entire plant. And if, say, mechanical damage to the root system was caused by planting in a garden bed, they only turn yellow lower leaves. In this case, you should wait until the seedlings take root and new adventitious roots appear - the tomato will cope with chlorosis on its own.

To determine the cause of chlorosis, just look carefully at the leaves. young plant. And if it turns yellow specifically from the older (lower) leaves, it is also worth suspecting a lack of one of the chemical elements important for the tomato.

Most often, chlorosis of tomato seedlings indicates a nitrogen deficiency. It is indicated by the leaf veins of a bluish-red color, and small leaves on the entire plant as a whole. The lower leaves die off after yellowing. If the seedlings are grown for sale, you don’t even have to try to take them to the market: obvious signs chlorosis will scare buyers away from it, and no explanation of why tomato seedlings turn yellow will help.

Yellowing can also be caused by potassium deficiency, but here the process often goes too far due to the accumulation of ammonia nitrogen, accompanied by dehydration of the leaves and their curling, up to the appearance of signs of tissue necrosis.

The next reason why tomato seedlings turn yellow is zinc deficiency. It also reveals itself by numerous small yellow specks on young leaves. They are also abnormally small, can be entirely yellow, sometimes curling upward. in contrast, it appears immediately over the entire surface of the leaf, but passes much faster.

If chlorosis of young leaves of seedlings begins from their base, and the color from yellow-green through lemon yellow becomes yellow-white, then the plant reacts to iron deficiency. It is reflected only on young leaves, without moving to older ones. This type of deficiency can occur at an early stage of growing seedlings if its round-the-clock illumination is not supported by fertilizing containing iron. One has only to renew them, and the plant comes to normal condition in just a few hours.

But the deficiency of microelements and nutrients is relatively easy to correct. It’s a completely different matter when the answer to the question of why tomato seedlings turn yellow is the following: it’s fusarium. This dangerous fungal disease can affect tomatoes at any age. It is also difficult to fight it because the disease may be detected too late. The most effective remedy is prevention. But if the seedlings are already affected, they must be isolated immediately healthy plants from the sick; treat the first ones with the drug, the second ones - immediately destroy (burn).

Why tomato seedlings turn yellow: reasons

How to prevent yellowing of tomato seedlings?

There are several main reasons why tomato seedlings suddenly begin to turn yellow. If you understand each situation and find out the main reasons, it will be much easier to cope with the problem. The color of the leaves also depends on the nutritional conditions. Chlorotic leaves (usually on the lower tiers) are observed on soil rich in organic matter, but poor in copper, for example, peaty. In any case, when we are talking about a violation of the conditions of keeping tomatoes, and not an infection, it is important to understand why the physiological disease occurred, and eliminate its causes. When the leaves and stems continue to grow, feed the plants with a solution of slurry (1:10) or mullein (1:20) with ash.

If the growing conditions for tomatoes are not met, chlorosis may develop. Most often it affects young plants or seedlings.

Feeding and hardening off plants is the key to healthy seedlings

"Pentaphage";

In addition to physical damage to the plant’s root system and lack of nutrients, tomatoes can turn yellow in a greenhouse and when affected by a fungal disease such as fusarium. This disease manifests itself primarily by changes in tomato leaves, their elasticity and color.

Tomato leaves evaporate a large amount of moisture, and if a deficiency occurs, the upper leaves begin to turn yellow and curl. In greenhouses and greenhouses, another problem most often occurs, namely excessive air humidity.

You can also dilute a couple of glasses of table vinegar in 10 liters of water and also pour it into the mole cricket’s passages. That is, you should not overexpose the seedlings at home, sowing the seeds much earlier than the specified time, or provide each plant with at least 3 liters of soil. In order for the seedlings to “come to their senses” faster and

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Why tomatoes turn yellow in a greenhouse - a professional opinion

Pay attention to the choice of container for disembarkation: the container must have suitable sizes and a drainage hole for water drainage - the liquid should not stagnate
Transplanting tomato seedlings

If the yellow leaves have also become thick and hard, and the stems are woody, this means that the tomatoes do not have enough sulfur.

Reasons for yellowing of tomatoes in greenhouses

For successful treatment of fungal diseases, the main condition is strict adherence to preventive measures. First of all, disinfect the seeds. To do this, keep them for 20 minutes in a 1% solution of potassium permanganate, and then rinse twice with fresh water. Be sure to disinfect the seedling boxes. To prepare the soil mixture, take soil only in places where there are no signs of disease. If you plan to grow tomatoes in a greenhouse, it is better to prepare a new one soil mixture.

The cause of the disease is usually poor functioning of the root system.
"Alirin-B";
Fusarium wilt is caused by a soil fungus long time living in the soil. It can be transmitted through contaminated seeds, garden tools that were used to cultivate contaminated soil and were not disinfected, and plant remains.
To avoid this, you need to ensure good ventilation in a greenhouse (see Do-it-yourself ventilation in a greenhouse is possible). Excessive waterlogging of the soil can also lead to yellowing of leaves.
For reference: Wireworms are the larvae of click beetles, yellowish caterpillars, the length of which can reach 2 cm. They “specialize” in eating roots, but can also penetrate the stem of a plant.

to provide it with additional nutrition that it does not receive from the root system, it can be sprayed with a weak, 1% solution mineral fertilizers(phosphates, nitrates, chlorides)

Damage to the root system during transplantation

There are several main factors that cause yellowing of tomato leaves and trunks:
.
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When young and then old leaves acquire a light yellow color, and they all gradually dry out, it means that there is little manganese in the soil (this happens with excessive liming). With chlorosis caused by iron deficiency, old leaves do not die off. The remains of infected bushes must be collected and burned outside garden plot. Do not use them to make compost or other fertilizers. Disinfect garden tools thoroughly. The bed for planting tomatoes must be prepared in a disease-free place. Areas with heavy loamy soil are most susceptible to the spread of fungi. Therefore, if you plan to grow tomatoes in such places, be sure to dig up the soil, adding coarse sand. This phenomenon can cause fusarium wilt. Here we are talking about a dangerous fungal disease that quite often affects tomatoes.
"Fitosporin-M";
For this fungus, conditions conducive to growth and reproduction are high humidity along with high temperatures.
Yellowed tomato leaves may also indicate an insufficient amount of nitrogen in the soil. As a rule, plants suffering from nitrogen deficiency are weaker, with thin stems and small leaves.

Damage to the root system by insects

In order to get rid of them, you can use the drug “Bazudin”, which is mixed with sawdust or sand, and then dug into the soil around the plants. You can also treat the soil in advance, before planting tomato seedlings in the greenhouse.

Damage to the root system during transplantation;

If the soil is wet all the time, the roots of the plant will simply begin to rot. The most important thing is to maintain the required temperature. The most favorable temperature is about 25 degrees Celsius. Also remember that tomato seeds love moisture. This makes caring for tomatoes a fairly delicate process. Make sure that the soil does not dry out, but is not too moist.
Causes of yellowness:
Yellowish-green color and yellow spots between the leaf veins is a sign of nitrogen starvation. With magnesium deficiency, reddish pigmentation appears in areas of chlorosis, and the edges of the leaves curl upward. General yellowing of the plant can also be caused by excess phosphorus.

The application of sufficient amounts of potassium and phosphorus fertilizers helps to increase the resistance of tomatoes to fungal diseases.

Disturbance in root nutrition occurs when they are damaged or the plant is overcooled. Moreover, non-optimal temperature conditions affect all phases of plant development, including fruiting. The leaves become yellow, often with a bluish tint.
"Mikosan";If only the old, lower leaves of the plant turn yellow, and with new ones growing above, no such problem is observed, then this
To do this, three to four days before planting the plants in the greenhouse, pieces of carrots, beets or potatoes are buried to a depth of about 10 cm, which are strung on long sticks

Deficiency or excess of moisture

That is, per 1 liter of water you can put no more than 10 grams of dry fertilizers or 10 ml liquid fertilizer.You can put less fertilizer, but you can’t put more, as you can burn the leaves. Damage to the root system by insects;Proper feeding of tomato seedlings will avoid yellowing and other problems that can lead to death and disease of tomatoes. We feed the plants for the first time after germination - literally after 7-10 days. Next time – in another two weeks. Can be used for feeding special means for tomato seedlings, or prepare the mixture yourself: take 10 liters of water, dissolve 35 g of superphosphate and 5 g of urea in it. If the plants begin to turn yellow from the bottom leaf, and at the same time you can notice bright red veins on them, then the problem is nitrogen deficiency is the most important element for tomatoes. IN in this case You may also find leaves that are too small. You need to use nitrogen fertilizers, which can quickly correct the situation. But with its deficiency, chlorosis develops only at the top of the leaf, then this area dies.
At the same time, you can spray with a solution of potassium permanganate (1 tbsp per 10 liters of water).

It also happens that the seedlings have grown quite well, but are slightly overgrown. Why does yellowness occur? When transplanted into a greenhouse, the plant's roots form an intertwined ball. As a rule, such seedlings require much more time to adapt, during which the overgrown roots die off and the tomato leaves begin to turn yellow.

Lack of minerals and trace elements in the soil

Nitrogen starvation

"HOM".
Fusarium can affect plants at any stage of their development: both in seedlings and in adulthood. First of all, the fungus affects the root system of tomatoes, after which it spreads to the stem, and subsequently disrupts the entire supply system of the plant. nutrients.the problem can be easily solved by adding nitrogen-containing fertilizers or manure to the soil15-20 cm

You can spray the seedlings with a similar solution every day until the plant adapts and new roots and leaves are formed, which can provide nutrition to the plant.

Potassium deficiency

Lack of minerals and trace elements in the soil;

Manganese deficiency

It is prohibited to use any type of fertilizing on a dry clod of soil. This can lead to burns on the roots of plants, and therefore the soil must always be moistened. There is one common reason for food - the plant lacks potassium. Here you also cannot do without fertilizers.
In all cases, if plants suffer due to a violation of the conditions of maintenance, and not due to infection, eliminate the cause of the physiological disease. And as soon as the stems and leaves begin to grow, feed the planting with a solution of mullein (1:20) or slurry (1:10) with ash.

The reason may be poor growing conditions for tomatoes.

Fungal diseases

Fusarium

Often after transplantation, diseases such as fusarium wilt, a fungal disease that often affects tomatoes, can develop. It is expressed in the withering of leaves and loss of their turgor. The disease is caused by soil fungi that can for a long time live in the ground. They can significantly reduce yields. The source of the disease lies in contaminated seeds, plant debris or soil cultivation tools. By the way, the likelihood of tomatoes being affected by fungus does not depend on age and is the same for both seedlings and plants located in a greenhouse or open ground. First, the disease affects the root system, then spreads to the stem and, ultimately, disrupts the functioning of the vascular system. This is why the plant weakens and growth is stunted, accompanied by the appearance of yellowness on the leaves.
You can try to save diseased plants:
This disease can be treated with drugs such as:

. The manure is diluted with water and infused for a week, after which it is diluted in a ratio of 1:10 and watered over the tomatoes.

. the tips of the sticks should be above the surface of the ground.
Of the possible measures that can still be taken in order to “reanimate” such seedlings, during the transplantation process, treat the roots with any root formation stimulator, for example “Kornevit” or “Kornevin”, according to the instructions from the manufacturer.

Deficit or excess of moisture;
Problems with yellowness can also be caused by a lack of oxygen in the root system: as a result of watering and fertilizing, the soil around the roots of the plant becomes compacted, and a thin crust appears on the surface of the earth, which prevents the supply of oxygen. To prevent this from happening, be sure to carefully loosen the surface of the earth - for this it is better to use a picking stick so as not to damage the roots.

Late blight

If the leaves also curl and become speckled, then the problem is a lack of zinc. The seedlings will have to be fertilized.
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Moreover, seedlings and young plants most often suffer from physiological diseases.

If only the lower leaves of the plant turn yellow, this indicates mechanical damage to the roots. For example, when loosening the soil or when planting seedlings in beds. There is no need to worry about this: when new adventitious roots appear and the plant takes root, the color of the leaves will be restored.

Bordeaux mixture;
"Previkur";
After a couple of days, the sticks, along with pieces of vegetables and the wireworms that have settled in them, are pulled out and burned.
Insects, such as mole crickets or larvae of click beetles, more often called wireworms, can also damage the root system of tomatoes. All these pests love to “feast” on tender roots.

Various diseases (see Tomato diseases in a greenhouse: their varieties and how to deal with them).

It is important to harden off the plants. About 20-25 days before planting, you need to start hardening off the seedlings, accustoming the plants to direct sunlight. You can take the container with tomatoes to the balcony or put it outside. At the same time, you should begin to harden the tomatoes gradually:
When the yellowness on the leaves turns into white spots, the problem is that the plant simply does not have enough iron. If you choose the right fertilizer, the problem will be solved in just a day or two.
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The most common cause of leaf chlorosis is poor root function. Violation of root nutrition occurs when the roots are damaged and due to hypothermia of both the entire plant and only its underground part. Moreover, a violation of the temperature regime affects all phases of plant development until the end of fruiting. However, when cooled, all leaves turn yellow and acquire a bluish tint.

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Why do tomato leaves turn yellow in a greenhouse?

Particular attention should be paid to watering. Tomatoes have a main root that reaches 1.5 m in length, thanks to which they are able to tolerate drought. The main part of the roots is located no deeper than 25 cm. Moisture deficiency occurs due to the large evaporating surface of the leaves of the bush. If the soil is insufficiently moistened, yellowing and curling of the upper leaves is observed.

"Infinito";

The main causes of yellowing leaves

"Trichodermin."

If there is not enough calcium in the soil, then the leaves of the tomatoes also turn yellow. Only at first small light dots appear, which subsequently merge into a single light spot.

Tomatoes are quite large,

The mole cricket is a rather unpleasant insect, the length of which can reach 5-7 cm. It prefers well-manured soils enriched with humus.

Having listed the main reasons why tomatoes turn yellow, let's figure out what to do to save greenhouse tomatoes.

First expose the seedlings for several hours, then increase the time, the main thing is to put the plants in a warm place at night

Yellowing is caused by malnutrition of the roots. Most often, this occurs due to damage to the roots during improper planting or due to a change in temperature conditions. If the problem is in the roots, there is no need to worry - tomatoes can cope with this problem on their own after some time. The main thing is to try not to damage the root system anymore.

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If the roots are mechanically damaged (for example, after planting seedlings in a garden bed or when loosening the soil), only the lower leaves turn yellow. As soon as the plants take root and new adventitious roots grow, the color of the leaves and shoots is restored.

When growing tomatoes in a greenhouse or greenhouse, it often creates excess humidity air. If there is a lack of nitrogen in the soil, then in the first half of the growing season the leaves grow and turn yellow. Next, cracking of the fruits is observed. Hence it is clear why the main attention is paid, first of all, to the nitrogen content in fertilizing.

Nutrition is the most important factor

"Tattu".

Another fungal disease that causes tomato leaves to turn yellow in greenhouses is late blight.

Treatment and prevention of diseases

It is characterized by the fact that first the young leaves acquire a light yellow color, and only then the old ones.

about 1.5 meters

MedvedkaDamage to the root system of tomatoes during transplantation permanent place in a greenhouse or greenhouse. The roots do not fully perform their functions and do not deliver required quantity water and nutrients to the plant. In just a couple of days you can plant seedlings for a full day and night. Now you know why tomato seedlings turn yellow, which means you can quickly fix the problem if it occurs.

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Why do the leaves of tomato seedlings turn yellow?

JOY

A simple reason is the lack of soil in the container. If this happens to you, carefully transplant the tomatoes into a larger pot.

http://www.tomat-pomidor.com/2010/04/why do tomato seedlings get sick/ Why do tomato seedlings get sick?

The following situation may arise. Thanks to its long (up to 1.5 meters) main root, the tomato tolerates drought. But the main part of the roots is located at a shallow (15-25 centimeters) depth. The evaporating surface of the leaves of the bush is large, and with a lack of moisture, the upper leaves become yellow. If there is not enough moisture, then along with yellowing, curling of the leaves is observed.

High air humidity combined with a lack of calcium and poor watering provokes the development of chlorosis on upper leaves, blossom end rot appears on the fruits. Excessive or prolonged soil moisture should be avoided, and an appropriate microclimate should be maintained in the greenhouse or greenhouse.

But the main preventive measure will be thorough disinfection of the soil (see How to treat the soil), for example, with a rich pink solution of potassium permanganate both in the fall, after harvesting, and in the spring, before planting plants in the ground.

This disease manifests itself as brown spots on yellowing, drying leaves, which then spread to the fruits. As a disease prevention, experienced gardeners It is recommended to water tomatoes only at the root, or with drip irrigation systems.

A deficiency of this element in the soil can be caused by too much lime applied to the soil.

, the main root, thanks to which the plants are quite resistant to drought. But at the same time, the main part of the small roots is located at a depth of just

The mole cricket builds its nest at a depth of 10-15 cm, from where it makes its way to the roots of plants. To combat this pest, you can use the drug “Thunder” or “Medvetox”.

This phenomenon is most often observed in seedlings that are slightly overgrown or grown in very small containers. The roots of such seedlings are a dense tangle.

Sometimes, on seemingly strong and healthy tomato bushes growing in a greenhouse, individual yellow leaves appear.
Light problems can also cause seedlings to turn yellow. It is best to extend the length of daylight for plants by using lamps for at least 6 hours a day.

In greenhouses and greenhouses, on the contrary, excess air humidity is sometimes created. If the beds are poorly filled with nitrogen, then in the first half of the growing season the leaves will grow and turn yellow, and in the second half the fruit will crack.
The nutritional conditions of tomatoes directly affect the color of the leaves. Its change is associated with a lack of nutrients. In soil with a low copper content, but rich in organic matter, chlorosis is observed on the leaves (usually the lower tier). If the leaves turn yellow, become hard and thick, this indicates a lack of sulfur. With excessive liming, the appearance of a light yellow color on young and then old leaves, along with their gradual drying, indicates low content manganese in the soil. In addition, chlorosis occurs with iron deficiency, but the death of old leaves does not occur.
The appearance of yellow color on tomato leaves is a very common phenomenon. Many gardeners are probably familiar with the situation when, despite optimal watering and care, tomatoes dry out and turn yellow. Regardless of the planting location, be it a greenhouse or open ground, the problem remains. To understand why this happens, we need to look at the possible causes.

For any deficiency of minerals or trace elements in the soil, you can add a solution of slurry, in a ratio of 1:10 with ash, or a solution of mullein, in a ratio of 1:20 (see Feeding tomatoes: what fertilizers and when to use).

Hello, dear readers!Today, no one will be surprised by the fact that you can buy whatever comes into your head at every step, which is why the sale of tomato seedlings has also not amazed anyone for a long time. Any variety to choose from, and now - a box of young plants is yours, without painful months of nurturing on the dim windowsill of a Khrushchev-era apartment building.

Growing seedlings at home is not easy, and many people actually buy plants that are ready for planting in the ground, at the risk of acquiring sick, weak or unsuitable for growing in the conditions prepared for them. But this is if you are a beginner.

An experienced gardener with plants will immediately understand both the involvement of the variety and the state of health, but that’s why he is experienced, not to do this, but to grow it himself. If you don’t have time to bother with growing, and you still go to the market, then read.

At the beginning of its growth, a tomato can be quite finicky, and in any case, whether you bought seedlings or grew them yourself, it can present you with a surprise in the form of yellowed leaves. The only difference will be that you studied your own shoots during their growth, but under what conditions you grew the purchased ones is a mystery.

One way or another, it will still be necessary to identify the cause in order to eliminate the symptom that has arisen, which clearly signals feeling unwell tomatoes. In this article we will look at possible options what to do if the leaves of tomato or pepper seedlings turn yellow.

Yellowing of leaves is a fairly common problem that can occur with tomato seedlings, even if they receive both food and light. There can be many reasons for this phenomenon:

You overdid it and flooded the plants during the next watering
You overlooked and underfed the plants - now they are hungry
You grow seedlings in cramped containers that are already filled with roots
Your plants are nitrogen deficient and unable to grow further

Your plants are experiencing light deficiency, which means they are starving again
Your plants are suffering from acidified soil, check if the soil in the box is turning white
Your plants are frozen, sick and will soon shed yellowed leaves.

Overmoistening

Excess moisture in the soil can cause fungus, which develops in damp conditions, or root rot, or both. Plus the water washes everything away useful material, and the plant starves. Here are the yellow leaves for you.

There is no point in waiting for the moisture from the soil to evaporate; you just need to change the plant’s substrate - there is no other way out. And don’t forget to make drainage and a drainage hole in the new container.

In order to determine the optimal moisture content in the soil for seedlings, you need to stick your finger into the ground. If the soil is wet and sticks to the skin, then watering should be postponed.

Late blight

Take care of preventive measures to combat late blight should be done in advance, even at the seed stage. To do this, the seeds must always be treated in a solution.

When the fungus has finally reached the seedlings and settled on the stem and leaves, you will have to change the substrate and disinfect the boxes or glasses, and destroy the infected shoots. Only such extreme measures will save the remaining plants from death.

Nutritional deficiency

It is recommended to feed seedlings only if they require it. Typically, tomatoes are sown in nutrient soil, where all the necessary elements are already present, and after certain time When they run out, young tomatoes are fed with a special microfertilizer for seedlings. Maybe the time has come to feed if the lower leaves have turned yellow, and there are no other reasons for this.

Light deficiency

With a lack of light, the seedlings first stretch out and become thinner, and then begin to turn yellow. Direct sunlight can be detrimental to young shoots, but the lack of light will also have a detrimental effect on them. Seedlings need to be acclimated to the sun gradually, by exposing plants to light for a certain time, gradually increasing it.

Try not to thicken the plantings and not to be greedy. It is better to grow 20 strong tomatoes than 50 thin blades of grass that cannot withstand transplantation.

Nitrogen deficiency

With nitrogen deficiency, the leaf blade itself turns yellow, but the veins remain green, so this symptom is easier to track than others. Nitrogen is responsible for plant growth and is very necessary for tomatoes at the beginning of development.

With its deficiency, the plant first turns pale and becomes light green, and if no measures have been taken, it begins to signal starvation by the yellowness of the leaves. But even at this stage, fertilizing with nitrogen-containing fertilizer will save your tomatoes.

Limiting root growth

If you did not calculate the volume of the cups and underestimated your plants, then it may happen that they outgrew their containers and filled the entire soil with their roots. Transplanting tomatoes into a larger container will help them recover.

But give them time for this; it often happens that the leaves of seedlings turn yellow after transplantation and experience temporary stress in larger containers. Often, tomato seeds are sown immediately in separate cups and do not waste time on picking, which takes away the strength of the seedlings.

Soil acidification

Acidic soil takes away the last strength from tomatoes, and makes them defenseless against the threat of infection.

Place the glass on a black bag and sprinkle some soil from the seedling box on top. Add 9% vinegar on top. The absence of any reaction will indicate that there is increased acidity in the soil, and this has a detrimental effect on the seedlings (read how else you can easily and simply).

Application to the soil will help neutralize acidification.

Temperature drop

A sudden cold snap can strike even on the windowsill of a closed window,

therefore, you should always monitor the weather forecast and wrap the shoots. This problem is especially acute when seedlings are grown in a greenhouse or greenhouse. It is necessary to provide plants with reliable shelter, which should not interfere with sunlight, especially during flowering.

So, let's summarize. If you initially planted treated seeds in separate cups, having previously placed nutrient soil in the containers and provided them drainage system, then all that remains is to monitor the lighting and water the plants on time warm water. That's all the secrets of growing seedlings without yellowing leaves.

Happy harvest and see you soon!

Sincerely, Andrey!

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There are several main reasons why tomato seedlings suddenly begin to turn yellow. If you understand each situation and find out the main reasons, it will be much easier to deal with the problem.

Causes of yellowness:

The first thing you need to do to prevent yellowness from appearing on the leaves is to create the necessary conditions for the growth and development of seedlings. So, it is important to choose the right soil and maintain the appropriate level of lighting and humidity. Don't forget about regular watering and fertilizing with nitrogen, iron and zinc. Pay attention to the choice of container for planting: the container must have suitable dimensions and a drainage hole for water to drain - the liquid should not stagnate.

Proper feeding of tomato seedlings will avoid yellowing and other problems that can lead to death and. We feed the plants for the first time after germination - literally after 7-10 days. Next time – in another two weeks. To feed, you can use special products for tomato seedlings or prepare the mixture yourself: take 10 liters of water, dissolve 35 g of superphosphate and 5 g of urea in it.

It is prohibited to use any type of fertilizing on a dry clod of soil. This can lead to burns on the roots of plants, and therefore the soil should always be moistened.

Problems with yellowness can also be caused by a lack of oxygen in the root system: as a result of watering and fertilizing, the soil around the roots of the plant becomes compacted, and a thin crust appears on the surface of the earth, which prevents the supply of oxygen. To prevent this from happening, be sure to carefully loosen the surface of the earth - for this it is better to use a picking stick so as not to damage the roots.

It is important to harden off the plants. About 20-25 days before planting, you need to start hardening off the seedlings, accustoming the plants to direct sunlight. You can take the container with tomatoes to the balcony or put it outside. In this case, you should begin to harden the tomatoes gradually: first expose the seedlings for several hours, then increase the time, the main thing is to put the plants in a warm place at night. In just a couple of days you can plant seedlings for a full day and night. Now you know why tomato seedlings turn yellow, which means you can quickly fix the problem if it occurs.

Causes of yellowing seedlings

Too much waterlogged soil

You can spray the tomato leaves with this solution as much as you like, even every day, until the new leaves that have already grown in the greenhouse begin to work and provide for the plant. There should be no illusions about the restoration of old, yellowed leaves - they are unlikely to ever recover. You will experience a delay in the development of the plant for more than a week or two, which is unpleasant, but not fatal.
When caring for tomato seedlings, do not get carried away with excessive feeding. Excess fertilizer in the soil can also cause tomato seedlings to turn yellow.
Secondly, as a result of humidity, plants can become ill with putrefactive diseases, late blight, or even blackleg.
The fungal disease fusarium is another cause of yellowing of leaves. Not only the yellowness, but also the simultaneous lethargy of the leaves, as if the tomatoes have not been watered for a long time, will help determine whether the plant is suffering from this disease or another reason. Of course, prevention is the best way to combat fusarium. But, if this does happen, treat the seedlings 3-4 times with an interval of 1.5-2 weeks, for example, with Fitosporin.
If you notice signs of the disease at the very beginning, when not all seedlings are affected by the black leg, but only a smaller part of them, there is only one way out: transplant healthy plants into another disinfected container filled with new healthy soil.
What a pity it is to see that tomato seedlings, which we nurture at an early stage of development, suddenly begin to wither and the leaves turn yellow. All the reasons why tomato seedlings wither or their leaves turn yellow can be combined into two main groups. These are, first of all, errors in caring for young seedlings and diseases or pests.
Malnutrition of the root system of tomatoes also very often leads to yellowing. Such disturbances usually occur due to damage to the roots, which are very sensitive to physical impact, as well as changes in temperature. Most often this happens when transplanting tomatoes into open ground. Don’t worry, after some time tomatoes cope with chlorosis caused by these factors on their own.
Tomatoes – favorite plant our hostesses. They put their whole soul into them and take care of the young seedlings as well as children. And housewives are very worried when their seedlings begin to get sick and wither. Why tomato seedlings turn yellow and wither and what to do about it - read below.

There may be several reasons for the yellowing of tomato seedlings. I never use purchased soil to grow seedlings; I had a negative experience when all the seedlings turned yellow and disappeared. I take forest land or from the country, add sifted ash and sand to it. If the seedlings are already in such a condition that they can be transplanted, then try replanting. Seedlings should not be over-watered or over-fed with fertilizers; they may also turn yellow. From bright sunlight, especially seedlings that are not strong and not hardened can turn yellow; from too low a temperature, it should not be lower than 15 degrees. To save the seedlings, you can spray them in the morning or evening with immunostimulants such as Silk or Epin, preparing the solution according to the instructions. (the leaves do not turn yellow completely, but in “spots”) - feed. Tomatoes are generally very demanding when it comes to feeding.

- reduce watering and let the soil dry out a little, and also check the root system of the seedlings - if it is rotten, the plants can no longer be helped.

There are options for yellowing of leaves - for example, the roots can be chewed by a mole cricket, or simply the soil temperature is too low and the plant does not take root well... Often in this case, in addition to yellowing, there is also purple stem and leaves. It may simply be very hot and dry, and the plant cannot acclimatize. In any of these cases, spraying with a light fertilizer solution will not hurt.

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Tomato seedlings - why they wither, turn yellow and may even die

And finally, seedlings transplanted into open ground can simply turn yellow from drought. Just as tomatoes do not like an abundance of moisture, they also cannot tolerate a lack of it. Moisten the soil in a timely manner within reasonable limits.

Why do seedlings wither?

I advise that when the leaves droop, water and spray the seedlings with a pink solution of potassium permanganate. In these cases, you can also spray with the highly effective preparation “Epin” and place the pots with seedlings in the sun to dry.

Have a good harvest!

But it is best if you prevent this disease in advance. It helps to avoid it by watering the soil with a weak solution of potassium permanganate.

A sad sight. But there is more than one reason. No matter how sorry you are, you will have to pull at least one seedling out of the ground and carefully examine both the top and the roots. And pay attention to the ground.

A trivial reason, but it can provoke yellowing of all seedlings - lack of soil in the pot. If this happens to your tomatoes, then try to move them to a larger container as quickly as possible.

A little science

If the seedlings turn yellow, I do everything I can, change the location (maybe shade or cold), spray with a weak solution of urea (maybe lack of nitrogen), try not to overwater (the roots may rot from excess moisture), you can feed with a solution of potassium permanganate (kills microbes in soil). But the seeds may not be of high quality, they are contaminated. Therefore, I always plant more seedlings than necessary. If the seedlings turn yellow almost before planting in the garden, then perhaps they will perk up and turn green when they are transplanted to a permanent place. It happens that there are not enough roots places, so the seedlings wither.

Acidic soil

Plants are crowded

Why do the leaves of tomato seedlings turn yellow?

There is not enough food. May lack nitrogen and/or trace elements. This is if the seedlings are not yet in the ground. If it turns yellow immediately after planting in the ground, then this is most likely the result of stress: during transplantation, the plant’s small suction roots and root hairs may be damaged, nutrition may be disrupted, and the leaves turn yellow. In addition, if the seedlings are not hardened (they were kept warm all the time), then when transferred to conditions with a lower ambient temperature, the roots also begin to absorb water with dissolved minerals. substances worsen, and nutrition is disrupted. Therefore, it is recommended to harden the seedlings and do not recommend fertilizing earlier than 1-2 weeks after transplanting.

First of all, what is yellowing of leaves if it begins precisely with the lower, older leaves and if the entire leaf blade turns yellow, and not the veins? From a botanical point of view, this is a lack of nutrients, primarily nitrogen. Why does this very deficiency occur and how to deal with it?
I have sometimes observed that after picking, tomato seedlings on the windowsill begin to turn yellow. I want to say that this happens due to improper growing conditions. So low illumination during short daylight hours can be the reason for this. It is necessary to arrange additional lighting so that there is at least 15 hours of daylight per day.
ABC of dacha. Learning to work in the garden
There is more than one reason for this. Experts identify six factors that contribute to yellowing of leaves. If you pay attention to this in time, there is a high probability of helping tomato seedlings and eliminating the causes.
Any seedling loves moisture. Tomato seedlings are no exception. But if water stagnates in the container in which you grow seedlings, the roots may suffocate. It is in this case that the reaction of the seedlings is withering of the leaves. What should you do first? Make drainage holes in the bottom of the container or, if there are any, make them wider so that excess water can drain into the pan.
If tomatoes are transplanted incorrectly, sometimes you end up with clumps of roots, which also prevent the seedlings from fully developing, because through such jungle the flow of water and substances is very difficult.

All plants contain a substance called chlorophyll, which is an important component. Thanks to chlorophyll, the connection between the sun and environment and the plant itself. Chlorophyll filters the necessary organic substances from water and air with the help of sunlight. If this process does not occur, then you can hear about a disease such as chlorosis, as a result of which the leaves of tomato seedlings turn yellow.

ogorod23.ru

There are several reasons: one of the key reasons is excessive moisture, lack of space, little light or nitrogen, or high acidity of the soil. If there is a lack of nitrogen in the soil, the leaf blade begins to turn yellow, but its veins remain green. If the roots are very crowded, if they are very tangled, then the leaves also begin to turn yellow. Maybe the seeds were infected with fungal diseases. Lack of sun, too much moisture, the ground has cooled too much, maybe it’s not very warm on the balcony.

- change the substrate to neutral or slightly acidic.

Helping tomato seedlings not turn yellow

, they grow too close to each other - plant young plants so that each has its own place for growth and development.

Reasons

If only the lower leaves have turned yellow, and new ones grow normally, then there is nothing to worry about

The cause of yellowing seedlings may be improper soil composition. Heavy soil, poorly permeable to moisture, acidic soil composition, low aeration can be the causes of yellowing. The seedlings must be ventilated, taken out to the balcony, coarse sand and peat added to the soil mixture, and not overfed with nitrogen. Then the tomato seedlings will delight you with dark greens and thick stems.

Yellowing lower leaves after transplanting the seedlings into the ground to a permanent place. This usually happens when the seedlings grew in small pots or cells. And after transplantation, the roots began to grow rapidly, taking food from the lower leaves. Try not to allow the root system to overgrow - start replanting plants until the roots of the earthen ball are completely braided, then the roots will grow naturally.

Why do picked tomato seedlings turn yellow?

The second reason for wilting is too dry air in the room. Tomato seedlings love warmth, but if you place them next to a hot radiator, the dry air may cause the seedlings to become lethargic. In this case, the tomato seedlings should be placed away from the heat source and they will come to life. Don't forget to spray it. Spraying moisture will increase air humidity and provide additional moisture to the leaves.

Poor lighting is another reason for yellowing leaves. Try to extend daylight hours for your pets using backlighting by about 4-6 hours.

Why do tomato seedlings turn yellow in open ground?

In this paragraph, we will consider the most common causes of yellowing, to identify which you need to carefully examine your seedlings.

Leaves of tomato seedlings that have not yet been planted may turn yellow for various reasons. These reasons may be: improper care, high humidity, or vice versa dry soil, lack of nutrition, soil acidity, fungal diseases plants. Also, the leaves of tomato seedlings may turn yellow after transplanting into a larger container, that is, the roots were damaged during transplantation or they became tangled.

Do not overwater the seedlings

Plants grow in too much soil

yellowing of tomato seedlings

Option one. The seedlings were fat, good quality, but slightly overgrown, or simply the volume of soil was a little (or a lot) less than necessary. When transplanted into a greenhouse, there was a clump of roots in the pot, intertwined into a dense ball. It is precisely these seedlings that most often take a long time to take root, and it is these tomatoes that have leaves that turn yellow, right up to the very top. The fact is that the roots, which have grown insufficiently, are already beginning to hurt and die. At home, you can’t tell from the outside that something wrong is happening with the roots... But in the greenhouse, the tomatoes begin to grow new, healthy roots, and later leaves, but the old roots no longer provide nutrition to the old leaves, and they begin to turn yellow.

azbukadachi.ru

Sergey

Working in the garden and in the garden, no matter how much I want, I sometimes notice how tomato seedlings planted in open ground die. The leaves turn yellow and fall off.
The reasons why tomato seedlings turn yellow are different. Maybe it was over-filled with water, or, on the contrary, the plants lack moisture.
The leaves acquire yellow, giving off a blue color when the top of the plant or roots experience sudden temperature fluctuations. This is the cause of measles nutritional disorder. It has already been said above that it is advisable to avoid hypothermia of tomato seedlings.
The third reason is drafts. Fresh air is beneficial for seedlings, but streams of cold air from an open window are detrimental to young leaves - they wither. This problem is also easily fixable - move the containers with tomato seedlings to another place or do not open the window for a while, do not create a draft.
All the described reasons refer to diseases that develop over more than one day. Saving seedlings in such cases is quite simple, and now you know how to do it. But what happened if the seedlings turned yellow and began to wither in one day? Let's talk and
If tomato seedlings turn yellow, starting from the lowest leaves, and bright veins of blue or red colors are observed, then we can assume a lack of nitrogen, which is one of the most important elements for tomatoes. In this case, the phenomenon of small leaves is also often observed. In this case, liquids will help nitrogen fertilizers, which in as soon as possible will correct the situation.
First aid for stressful situations for tomato seedlings, if suddenly the seedlings are frozen or burnt, it is to spray with the preparation "Epin".
(underwatering is better than overwatering), since too much waterlogging of the soil at the very beginning of plant development leads to root system is formed very poorly and in the future the plants will be very vulnerable to heat and disease, and may also drop flowers.

Alrami

- transplant young plants into small ones peat pots(the roots of young plants cannot “cover” a large volume of soil). The roots must completely “master” the earthen ball and only after that they can be transplanted into a slightly larger volume (the pot is 1-2 cm larger than the previous one).

The tomato seedlings have turned yellow. What to do if the tomato seedlings turn yellow?

Evil Owl

and ways to eliminate this problem:In the photo above you can see a bush whose lower leaves initially turned yellow, but thanks to the heated soil and due to the fact that the seedlings were not overgrown, the plant quickly recovered and grew a new mass of both roots and fresh ones , green leaves. One of the reasons for this, as I noticed, may be that you bought unhardened seedlings grown in greenhouse conditions and planted them immediately in open ground. It was probably intended for a greenhouse, but you were not warned. Unhardened seedlings with the first rays of sun or morning cold begin to turn yellow and die. Immediately bring it into the greenhouse or room, and gradually fill it in for open ground.

Perhaps the plants are suffering from late blight or are lacking nutrients. Acidic soils, low temperature, tight dishes. There are reasons for everything, and they can be corrected. Yellowing of only the lower leaves occurs when the root system is severely damaged during replanting or loosening the soil. For the plant to recover, it needs time to grow new roots and leaves.
Well, the fourth reason is elementary - drying out of the soil, insufficient watering. Just water the seedlings.about this.
Another popular cause of yellowing may be a lack of potassium, which you will have to combat with the help of fertilizers. If there are few yellow leaves, then dilute 3 drops in 100 ml of boiled water.
There can be many reasons, as well as options for salvation. There may be waterlogging of the soil, lack of light, although there may be an excess if it is in bright sun. The reason may be either cold or lack of space in the container. First of all, we must try to determine the cause and urgently change the conditions, since most likely it is still possible to save the seedlings. If there is no waterlogging of the soil, then it is worth watering the seedlings with fertilizer usual for seedlings. If there is not enough light, then you can put the seedlings under a lamp; it is advisable, of course, to buy a special one, but for a while a regular energy-saving one will do. The temperature is too low
Lack of lightHow to deal with this? Well, first of all, you shouldn’t overexpose the seedlings at home, you shouldn’t plant the seeds earlier optimal timing landings. Or provide each bush with a volume of soil of at least three liters... But since we have what we have, we can help our tomatoes using all possible methods. Since their root nutrition is impaired, they can be helped by spraying.
When tomato seedlings planted in open ground are attacked by late blight, I advise you to treat them several times with Acrobat before the rains arrive; Tattoo is also effective in this matter. Why do tomato seedlings turn yellow, wither, leaves fall off, and eventually die the whole plant? I also have my own explanations for this.
Lack of moisture can also cause yellowing leaves. As you know, the tomato plant has a long tap root, which receives moisture and nutrition from the depths. And if you water your tomatoes only from above with a small amount of water, then it is this main root that does not have enough water. The basic rule for watering tomatoes is to water rarely, but abundantly. All of the reasons listed above are mistakes in caring for tomato seedlings, which are quite easy to eliminate. But the same mistakes can turn into more complex problems that are more difficult to deal with.

Sharp yellowing of seedlingsThis reason is also a lack of nutrients, which include zinc. Its deficiency manifests itself not only yellow leaves, but also with specks, as well as with sheets curling upward. Fertilizers will come to the rescue again.

Tanna

If almost all of the seedlings have turned yellow, but this is not a fusarium disease, then spray for 3 days in a row, then once or twice a week.

If the seedlings suffer from cold, then protect the seedlings from drafts; if they are standing on a window, then put newspaper under the seedlings and egg cartons work well to create air cushion and do not allow the roots to freeze, you can also water them with warm water.

in a room with seedlings - move the seedlings to a warmer place. Optimal temperature for seedlings - 15-20 degrees Celsius.

angren

- move the seedlings to a more illuminated place or illuminate with a phytolamp.

Svetlana 100

Make a weak fertilizer solution, the maximum concentration of salts (nitrates, chlorides, phosphates and other fertilizers) is no more than 1%. That is, for 1 liter of water you can take no more than 10 grams of fertilizer. In liquid fertilizers, the percentage concentration of salts is naturally lower than in dry fertilizers. But if it is not written on the bottle how much fertilizer can be poured for foliar feeding, then again we make a 1% solution, that is, 10 ml. liquid fertilizer per 1 liter of water. Less is possible, but more is not possible, otherwise pinpoint burns will form on the leaves.

alex-9572

You need to spray all the leaves, especially on the reverse side, where late blight actually begins to form. It would also be a good idea to spray the ground around.

Yulia Muromskaya

Firstly, seedlings can be accidentally watered. Tomatoes do not like excessive moisture; seedlings cannot be kept damp for a long time, and they should not be watered until the soil dries out.