Why tomato leaves turn yellow, elimination of the problem

Content:

The article explains why the leaves turn yellow in a tomato in a greenhouse, in an open field, near seedlings. Recommendations on how to fix the problem are given.

Fresh and radiant tomatoes. What could be better? Surely, in the country, everyone grows these fruits of the sun. But growing them is not as easy as it seems. This culture loves grooming. Tomatoes should be watered, fed, weeded, examined on time. And this is only a small part of what this vegetable needs.

Note, despite the vagaries of culture, tomatoes are very popular. They are happily planted by gardeners all over the world. And very often, after planting, the leaves of tomatoes turn yellow, and summer residents do not understand at all: why this is happening. Today we will try to shed light on the situation and describe the main reasons for such adverse events. So read our article and you will understand what the problem is and how you can solve it. Let's figure it out.

Why do tomato leaves turn yellow in a greenhouse

Very often, even in a greenhouse, the leaves of tomatoes begin to turn yellow. It would seem that the conditions for development are excellent: warm, light, normal humidity, but no, something is interfering. And the reason for this phenomenon lies in some of these factors.

First of all, pay attention to the watering regime. Tomato leaves often begin to turn yellow either from excessive soil moisture or lack of moisture. Perhaps the lower leaves of the tomatoes began to turn yellow because the soil is waterlogged. Remember that the development of the tomato is affected by both a lack of moisture and an overabundance. Do not water your plants, wait until the soil is dry, and then start watering the tomatoes at a lower intensity. Observe the optimal watering regime and then your plants will develop normally.

Often the leaves of tomatoes turn yellow and wither because the tomatoes are sick. So, in order to save the harvest, you need to start fighting disease. Sometimes the leaves turn yellow also because the plants simply need feeding. Try feeding the tomatoes with fertilizers containing nitrogen, so the green mass will grow more intensively, which means that the leaves will no longer wither.

Many gardeners resort to folk remedies, often the leaves and roots of tomatoes are treated with a solution of comfrey. In order to prepare this miracle cure, you need to put one kilogram of the leaves of this plant in a bucket of water, and then infuse for 5 days. After that, the concentrate should be diluted with water and sprayed with tomato bushes.

Sometimes the leaves turn yellow because the plants have a damaged root system. Very often, pests like to feast on tomato roots, so at first you may not even notice the appearance of insects on the site from above. Therefore, you will need to dig up damaged plants and see what state the root system is in. If you find damage and defects, then know that these are all pests and you need to get rid of them as soon as possible. Otherwise, you will lose your harvest.

If the humidity in the greenhouse is high, then the leaves of the tomatoes also actively turn yellow and rot. Waterlogging is especially dangerous at low temperatures, so be sure to keep an eye on the greenhouse and avoid such adverse effects.

Why do tomato leaves turn yellow in the open field?

If you grow tomatoes in the open field, then the leaves of plants can turn yellow for many reasons, let's deal with each one. Very often, during a cold snap, tomatoes begin to freeze, and the leaves turn yellow, remember that this culture is quite thermophilic, therefore low temperatures negatively affect the development and growth of the plant.

As well as greenhouse tomatoes, tomatoes in the open field are often affected by various diseases, and the roots are often eaten up by pests. It is from this that the leaves of plants often turn yellow leaves, so carefully monitor your site and carry out preventive examinations and treatments during time. Observe the watering regime, do not overmoisten the soil, this also negatively affects the growth of tomatoes. But a lack of moisture also leads to wilting of plants, which is why the rate is so important.

If there is an acute lack of nutrients and trace elements in the soil, especially potassium and nitrogen, then tomatoes also often turn yellow. In order for the plants to bloom and turn green again, you need to apply either organic or complex fertilizer to the soil. Nitrogen is of particular importance for greenhouse tomatoes. It is thanks to him that the green mass is actively growing in plants, which means that they develop and grow well. You can feed the tomatoes with bird droppings, manure, or any other organic matter. Sometimes the leaves turn yellow for a very trivial reason. During watering, loosening the soil or feeding, you could simply damage the roots, break the stem of the plant, and that is why the leaves often wither. Therefore, always be careful when working in the garden.

Why do the leaves of tomato seedlings turn yellow

Very often, mistakes in the process of growing seedlings lead to negative consequences, therefore, at this stage of plant development, it is especially important to monitor the growing conditions, as well as to properly care for the crop. If the seedlings have cramped conditions, a small box, then the plants feel bad, the root system of the seedlings does not develop, and the leaves turn yellow. Always follow the rate, do not plant too densely in the container. If you win in quantity, you will lose in quality. Remember this and dive plants in time.

If you water the seedlings too often, they can also turn yellow. Insufficient watering leads to a similar result. The optimum temperature for the development of seedlings is considered to be about 20-22 degrees, therefore, with severe hypothermia, the leaves of plants also begin to turn yellow.

In order for the seedlings to grow well in the soil, nitrogen must be added, even small seedlings need a lot of nutrients for development. As you know, in order for the process of photosynthesis to proceed, plants need sunlight, if the seedlings do not have enough light, then the leaves will not be green either.

Speaking about the type of soil, it is important to note that if the acidity level is high, then it is impossible to grow seedlings on such soil. To make the plants feel comfortable, add some wood ash to the ground. In addition, this organic additive also structures the soil, making it loose and soft.

Why do tomato leaves turn yellow after planting

Sooner or later, the seedlings will have to be planted in open ground, so it is important to monitor how the process of adaptation in plants proceeds during this period. In order for the leaves of tomatoes not to turn yellow, you also need to organize the irrigation regime well, do not overdo it with soil moisture.

During planting, special attention must be paid to the safety of the root system. If you damage the roots of the plants, then the seedlings may not take up, and if they adapt, they will grow poorly. In addition, the green mass of such plants will grow more slowly, tomatoes will need a lot of strength in order to restore the root system.

It must also be said that during the planting of seedlings in open ground, the air temperature should not fall, this negatively affects the development of plants. With hypothermia, the seedlings begin to stretch and turn yellow. Therefore, it is advisable to cover them in order to protect the stems and leaves from cold snaps.

Of course, after planting in open ground, the leaves of the seedlings may turn yellow from the development of diseases, as well as from the defeat of pests. Therefore, you need to be sure to start the fight against these ailments in a timely manner.

About upper and lower leaves

Sometimes in tomatoes, only the lower or only the upper leaves begin to turn yellow. Therefore, gardeners do not understand what is happening with the plants. Most often, these defects in development are associated with a lack of certain nutritional elements.

So if the top leaves of your tomatoes begin to turn yellow, and the flowers fall off, then this is considered a sure sign of calcium deficiency.

Perhaps you have recently added too much nitrogen fertilizers to the soil, and they interfere with the absorption of calcium, so it is advisable to spray the tomato bushes with a solution of calcium nitrate.

If the stems of tomatoes have thinned, and the veins turn red, then this indicates a sulfur deficiency. Treat the plants with a magnesium sulfate solution and they will start to develop normally again.

If, on the upper leaves in the center, yellow spots began to appear near the middle veins, then this indicates a lack of iron in the soil. And in order to remove this yellowness, you should spray the leaves with a solution of ferrous sulfate, some gardeners recommend adding appropriate fertilizers to the soil. But sometimes the same signs indicate a manganese deficiency, so pay attention to the color of the spots, if they are yellow-green, heterogeneous, then it is recommended to apply fertilizers containing manganese to the soil, and if the spots are just yellow, then this is a lack of iron.

When the leaves begin to deform at the base, and their color does not change, this is the first sign of a lack of boron in the soil. Dilute 10 g of boric acid in 10 liters of water and spray the plants, this will help you solve this problem.

If we talk about the yellowing of the lower leaves, then it is important to say that most often this is not associated with any diseases. Sometimes plants simply discard old leaves on their own in order to form new ones. This is a natural process, so you don't have to do anything. But still, try watering the tomatoes, adding a complex top dressing to the soil, this can help. So the plants will have more strength for development, and the leaves will fall off less.

We should also say that it is advisable to remove too yellow leaves, since over time they will still dry out and fall off. Therefore, immediately save the planting from unnecessary "mouths", because feeding diseased leaves is a waste of nutrients. But you need to remove these very leaves carefully, as you can damage the delicate skin of the stem. In order to remove the lower leaves, they should be pressed and then pulled up.

Many gardeners also complain that the leaves of tomatoes turn yellow only at the edges. This indicates a deficiency of nitrogen in the soil. Over time, they will also fall off, so it is advisable to add a urea solution to the soil, and if at the same time the leaves also curl, then this means that it is time to add potassium nitrate to the soil.

Conclusion

Yellowed leaves can be saved, so try to normalize watering of the plants, feed the tomatoes. Also try to warm the plants and normalize the lighting. Often, with a deficiency of various minerals and elements, the leaves also curl, so in this case it is best to feed the tomatoes with complex fertilizer. Carefully examine the plants, determine which microelements are enough for me, and only then feed them. Often the larvae of ticks and aphids attack tomatoes, so do not allow pests to appear on the site and treat the plants in time.Follow these recommendations, and your tomatoes will always be healthy and green.

Why do tomato leaves turn yellow?