Tomato seedlings turn yellow

Why do tomato seedlings turn yellow? This problem sometimes occurs among both novice and experienced gardeners. If tomato seedlings turn yellow, then the future harvest may have reduction in quality and quantity.
Causes Yellowing of the leaves may vary. Sometimes the lower leaves turn yellow and fall off, but the next leaves grow without any changes. Leaves may turn yellow due to exposure to low temperatures during frosts. The cause of yellowing of overgrown but high-quality seedlings may be shortage of land. Yellowing is also possible if a dense clump of roots, which led to lack of nutrition, disease and death of roots. Such seedlings always take a very long time to take root.
Yellowing of tomato seedlings is observed and for lack of nutrition. More often than not there is not enough nitrogen and other microelements. Seedlings may turn yellow immediately after transplanting them into the ground. It's connected with minor damage during the transplant itself, as well as exposure to lower temperatures, interaction with minerals dissolved in the soil.
To prevent yellowing, plants need to do feeding. The maximum concentration should be no more than 1 percent. At higher concentrations, pinpoint burns may occur. For this purpose it is convenient to use liquid fertilizers. They are considered safer. For each bush it is necessary to provide sufficient amount of land, one bush should have about three liters of soil.
If planting is done correctly, deadlines are met, and fertilizing will not cause problems with tomatoes.