Cultivation of tomatoes involved in most gardeners. This vegetable is included in the diet of almost every Russian, and as you know, self-grown tomatoes are much tastier than purchased ones. However, a common problem faced by gardeners during the period of tomato cultivation is the presence of yellow foliage.
Why do tomato leaves turn yellow in open ground? You will receive the answer to this question by reading this article. It will also feature a video that will also highlight this topic. To get rid of the yellowness of the leaves, you need to determine the original cause of this phenomenon, to understand the characteristics of the soil and the climatic conditions in which tomatoes grow.
Causes of yellowing tomato leaves
Lack of space for the formation of the root system
The most common cause of yellowing on the leaves is the lack of space for the development of the root system. Although it may seem that this problem concerns only planting tomatoes in greenhouses, but it was not there. If you plant the bushes in the open field too close to each other in order to save space, then you are completely faced with the fact that the leaves will turn yellow in tomatoes.
In addition, the leaves may turn yellow if the seedlings of the tomato grew in pots longer than necessary. The root system will also be weak if the seedlings do not thin out after the emergence of the first shoots. The fact is that the roots intensively develop in tomatoes already at the stage of growing seedlings, which is why it is important that there is enough space between the sprouts.Important! The first sign that the plants do not have enough space for the development of the roots, are yellowing lower leaves.
This is due to the fact that tomatoes spend all their energy on restoring the root system, and not on the growth and development of a healthy shrub.
To avoid yellow leaves of tomatoes in open ground, it is important to sow the seeds for seedlings in spacious containers. In addition, transplanting seedlings to open ground should be carried out on time.
If you still do not have time to complete the transplant in a timely manner and the roots have already grown strongly, then after the transplanting, it needs to be fed immediately. For this, salt fertilizers with the addition of chlorides, phosphates and nitrates can be used. Fertilizer concentration should be no higher than 1%. In this case, the leaves should not begin to turn yellow.
Important! In fertilizers in liquid form, the composition contains less salts in percentage ratio than in their dry analogues.
If you do not have information about fertilizer concentrate, then you need to make a weaker solution, so as not to overdo it. So, for 1 liter of water there are 10 ml of liquid fertilizers. If you make a very strong concentrate, then it is likely that you will burn the bushes of tomatoes and they, in addition to the fact that the leaves do not stop turning yellow, may even die.
One of the equally common reasons why the leaves turn yellow in tomatoes is the paucity of the soil. So, there may be a shortage of nitrogen. If you do not eliminate this problem, then over time, the stem of the plant will become weak and thin, as the bush will be intensely stretched upwards. In this case, the color of the leaves will be pale and there will be little on the bush. At the beginning, small yellow-brown spots will appear on the tip of the leaflet, merging in one line over time. The end of all this will be the slow dying off and falling off of the leaves, which will lead to the complete destruction of the tomato bush.
If there is little magnesium in the soil, the leaves will begin to turn yellow between the veins. Subsequently, they will begin to curl and bulge up. There is also a lack of molybdenum, however, the lack of this trace element is extremely rare. Weakly saturated color of young green leaves may indicate a lack of sulfur in the soil. At the same time, the adult leaves begin to turn yellow, and their veins become red. If the problem is not solved, then over time, not only the leaves will suffer, but the stem will become fragile and weak.
Iron deficiency leads to iron chlorosis. The leaves become pale yellowish with green veins. In this case, the growth of the bush stops and when inactive, even the apical leaves become pale.
With a lack of calcium on the leaves appear light yellow spots, and the fruits deteriorate due to top rot. But worse, the rot is passed from fetus to fetus. So, the top of the fruits of tomatoes becomes brown and is forced inside. Such tomatoes are unsuitable for eating. They should be destroyed.
What to do?
If the soil lacks any trace elements, then, of course, you need to make it fertilizer, which is part of the missing chemical element. For example, nitrogen starvation can be eliminated by spraying urea. To do this, prepare a solution in proportion - 1 tbsp. l urea per 10 liters of water.
To replenish nitrogen, it is also possible to add a solution from cow manure infusion to the soil. To do this, soak the mullein in water at the rate of 1: 4 for 3 days. Then dilute the mullein infusion in a ratio of 1: 3. Under each bush need to pour 1 liter of solution.Tip! Before feeding the soil should be moistened. Watering is carried out at the root, and not on the foliage.
Potassium deficiency is compensated by potassium nitrate added to the soil. To spray the leaves of a plant you need to dilute 1 tsp. fertilizer to 1 liter of water. To water the bush should dilute 1 tbsp. l potassium nitrate in 10 liters of water. Potassium deficiency can also be filled with wood ash.
Another reason why leaves become yellowed ahead of time is the lack of water in the soil. Tritely improperly organized watering can lead to the fact that the leaves of the bush of tomatoes become yellowed. Although tomato bushes are very drought tolerant, they will begin to turn yellow with a prolonged lack of moisture.
It is better to water the tomatoes infrequently, but plentifully. The root of the bush in the normal development of the root system reaches a depth of 1 m. This means that the plant is provided with water and nutrients from a sufficiently large depth, to which many other cultures can not reach. The conclusion is simple, if the tomatoes lack water, then they just need to be watered properly so that the leaves stop turning yellow.
Damage to seedlings during transplantation
The appearance of a painful yellow color after transplanting tomatoes into open ground may indicate that the seedlings were damaged during transplantation. In addition, adult bushes can suffer from inaccurate loosening, which can also lead to yellowing of the leaves.
In this case, the lower leaves turn yellow. All you need to fix the problem is to give the plant time to recover. With decent care and the absence of other negative factors, the leaves of the tomatoes themselves will soon acquire a healthy color.
Due to the spread of fungus, tomato leaves may begin to turn yellow. Such infections usually hide in the ground, which means that it will take a lot of effort to eliminate the problem. If there is a suspicion that the soil is contaminated, then one should dig the ground in autumn. At the same time, digging up the ground should be as deep as possible. In this case, the chance to infect plants in the coming year will be much lower.
A warning! It is unlikely that the gardener will be able to get rid of the infection at once. It usually takes several years with proper care of the ground.
Not only the soil can be infected, but also the seeds, and even the dacha tools used to cultivate the land. If we are talking about infection infection inventory, then you can not use the tools from the infected area of the earth on the healthy. These precautions are designed to stop the spread of the infection throughout the site. In addition, thorough sanitization of the entire instrument may be necessary.
Fungal lesions of tomatoes can occur at any stage of their growth. A rapidly developing fungal infection can lead to yellowing of the leaves, weakening of the bush and scarcity of the crop. Fight with the fungus is very difficult even, one might say, unreal. Therefore, the gardener needs to monitor the condition of the soil almost year-round. Seeds should be kept clean, and the instrument should be disinfected from time to time.
The most common fungal infection is Fusarium. With the defeat of the bush with this fungus, the leaves turn yellow and wither, as if after a drought. Spraying the leaves of tomatoes with special preparations every 1-12 days (depending on the severity of the disease), you can get rid of the infection. The most effective means in the fight against fungal infections at the moment are considered "Fitosporin" and "Fitotsid."
Supercooling when planting seedlings in open ground
When transplanting seedlings into open ground, yellow leaves may appear on it. Hypothermia can be one of the reasons. Tomatoes can be transplanted in open ground, if the temperature at night does not fall below + 12ºС.
The effect of low temperatures on tomatoes leads to negative consequences:
- Root depletion.
- Underdevelopment of the root system.
- The lack of nutrition bush.
- Slow growth and development of the bush.
If the bushes are frozen, the leaves will turn yellow with a blue tint. The harvest of such tomatoes will be later, the fruits will have a small size and will not have a pronounced taste. To avoid this, do not rush to transplant seedlings in open ground.Tip! If you still planted seedlings and unexpected cold began and the leaves began to turn yellow, then cover the beds with cardboard or double film.
So, if the leaves of tomatoes in your garden began to turn yellow, then determine the cause of this phenomenon. Then eliminate it and in time the leaves will turn green again. The tips provided in this article will help you identify the problem and neutralize its effects.
We offer you a video, which also mentions the common causes of yellowness of leaves and provides tips for eliminating them: