Possible causes of yellowing of leaves in greenhouse tomato seedlings

The yellowing of the foliage in tomatoes is a phenomenon that even an experienced gardener encounters. There are various reasons for this. It is important to identify the problem in time, understand what to do, and not only prevent plant death, but also get a bountiful and healthy harvest.

If the seedlings appeared in the greenhouse recently and after that turned yellow, it is possible that the root system was damaged during transplantation. The consequences of small damage to the roots in tomatoes disappear without external intervention when the plants grow new ones.

Mistakes in the care of seedlings and how to fix them

Overdrying an earthen coma can also be the answer to the question of why the leaves turned yellow. It is necessary to remove damaged parts, restore watering and treat the plants with a fungicide. Excessive moisture in the greenhouse and excessive watering can also cause a similar problem. For tomatoes, a little dryness is better than a bay. The greenhouse needs to be ventilated.

Another reason may be early planting of tomatoes in the ground. Sharp temperature changes negatively affect plants: they lag behind in growth and development, and the leaves turn yellow with a tinge of blue. There is no need to feed at low temperatures - this has a similar effect.

When the leaf blade turns yellow, but the veins remain green, this is a sign of chlorosis or lack of nutrients in the soil. It is necessary to determine which microelement the seedlings need, and add it to the soil.

Lack of trace elements in the soil

Let's list the main signs of a lack of trace elements in the soil.

• With an insufficient amount of nitrogen in tomatoes, the lower leaves turn yellow. The plants themselves look weak, the stems become smaller and thinner. It is necessary to feed the bushes with nitrogen-containing fertilizers.
• Small white dots can be an indicator of low potassium content, which increase until the leaf turns yellow completely.
• Lack of manganese in the soil can be caused by too much lime applied. Then the color loses first young and then old foliage.
• When iron is low, the sheet becomes marbled.

To compensate for the lack of any of these trace elements, you can add a manure solution to the soil and ash in a ratio of 1:10.

Advice

It is better to take the land for seedlings not garden or humus, but forest. Among experienced summer residents, the most balanced is the soil collected around maples.

Sometimes inexperienced gardeners ask themselves the question: why do plants begin to build up green mass instead of setting fruits? Excessive nutrient content of the substrate at the very beginning of development can cause the tomatoes to have pinch and pick them off the leaves. And one more thing: only the strongest specimens are chosen for planting in the greenhouse.

Seedling pests and diseases

Much depends on the planting material. The seeds can be infected with various fungal diseases, including fusarium wilt. At the same time, not only does the foliage turn yellow in tomatoes, but the bushes themselves look as if they have not been watered for a long time. The suspicious origin of the planting material is one of the reasons why experienced gardeners recommend using self-collected seeds for seedlings.

One of the most dangerous diseases for tomatoes is late blight. The diseased plant is covered with brown spots. The leaves turn yellow and dry out. The disease can spread to the fetus.

For the prevention of late blight, it is recommended:

• water the bushes only at the root;
• use drugs "Fitosporin", "Previkur", "Hom";
• shed the soil under the diseased plants with a pink solution of potassium permanganate;
• treat bushes with Bordeaux liquid.

Insects such as the wireworm and the bear are very fond of eating the roots of tomatoes. Means "Thunder" and "Medvedoks" work well against the bear. To combat wireworm the drug "Bazudin" is introduced into the soil around the plants.

Advice

Any seeds must be disinfected in a pink solution of potassium permanganate. Planting containers, gardening tools, and soil also need to be disinfected. This should be done immediately before sowing.

Output

There may be several reasons why plants in a greenhouse begin to turn yellow. What exactly happened can be suggested by the appearance of the bush. By carefully examining the plants, it will be enough to simply determine the source of the problem.

It is important to remember the basic rules for caring for seedlings:

• compliance with the conditions of detention;
• regular watering;
• timely feeding.

Thanks to this care, tomatoes will be able to cope with diseases on their own, repel pests and will certainly give a good harvest.