Why do tomato seedlings turn yellow in a greenhouse?

Sometimes you have to figure it out Why do tomato seedlings turn yellow? still at home. We understand that this may have a detrimental effect on future yields. After all, the reasons may turn out to be quite serious.
What to do if tomato seedlings turn yellow
It happens that the lower leaves turn yellow, but fresh leaves grow normally. In this case, there is no need to worry. Let's consider dangerous cases.
- The seedlings were good quality, only slightly overgrown - perhaps there was not enough land;
- When transplanted directly into the greenhouse, the roots near the pot were lumpy, they were intertwined into a large ball - then the seedlings can take a long time to take root, and the leaves of the bush can turn yellow right to the very top.
- If the roots are dry or diseased, they will begin to die. At home, the problem cannot be detected by appearance. In the greenhouse it becomes possible to grow new strong roots. A little later, the leaves also grow. Old leaves are left without nutrition and gradually die off.
- It is dangerous to replant overgrown plants. But the weak are not planted either. Nutritious soil and free space will help it take root. Warmed soil guarantees the growth of new leaves and, of course, roots.
You can create favorable conditions at home so that the sprout quickly adapts in the greenhouse. You will need a container with a different volume of soil. For example, from 3 liters.
Feed the plants. Let it be a weak solution. The maximum salt concentration should not exceed 1%. Liquid fertilizers are very convenient.They are safer, since the dry ones will have a higher concentration. Otherwise, the leaves may simply burn. In the greenhouse, the leaves are sprayed with the solution. But having found out why tomato seedlings turn yellow, you should not expect that the diseased leaves will come to life from the measures.