The yellowness which begins to appear on leaves tomato always has the reason, and often even not one. Its emergence can be promoted by at least six negative factors. They need to be found and eliminated in time.
Instruction
1. Maloperation of root system can become the first reason. There is it most often to seedling in pots or when planting of the outgrown seedling in soil. Tomatoes love scope and pretty fast increase roots. If earth volume in pot insufficient, seedling outgrows, roots densely braid earth lump and at change in soil young backs begin to let grow actively. Old leaves turn yellow because all force leaves on formation of roots. Seeds needs to be planted in the capacity of the average size and to land in soil when the earth lump still is completely not braided by roots.
2. Overcooling – the second reason of yellowing of leaves. It can be both overcooling of green part of plant, and the soil. Because of it root power supply is broken. All leaves on stalk get yellow shade with blue. It can negatively affect plants in any phase of development. Therefore it is better not to allow fluctuations of temperatures at cultivation of tomatoes.
3. Damage of roots which can happen at change of saplings or when loosening, can also be the reason of coloring of the lower leaves of tomatoes in are yellow color. In order that the yellowness has passed, the plant needs time for otrashchivaniye of new additional roots and leaves. After that green coloring of foliage, as a rule, is restored.
4. Yellowing of foliage tomatoes can react also to lack of moisture. Tomatoes – drought-resistant plants. But adult bushes have core root up to one meter long. And the plant extracts moisture from the soil by means of this root. Therefore if watering of tomatoes is carried out superficially, and moisture does not reach deep soil layers, the plant does not use this liquid. Tomatoes should be watered seldom, but it is abundant.
5. The lack of the microelements necessary for plant, affects leaves too. If the plant lacks nitrogen, on leaves yellow spots appear. If it lacks calcium, top leaves turn yellow. The shortage of copper leads to pobledneniye and yellowing of the lower tier of leaves. If in the soil there is not enough sulfur, leaves not just turn yellow, and are thickened and harden. The lack of manganese and iron leads to yellowing and drying up of leaves on all plant. Also leaves turn yellow from edges at the shortage of magnesium. And at lack of phosphorus only the leaf top whereas at its surplus – all its surface completely is painted in yellowish shade.
6. Fusariosis – the most serious reason for which leaves at tomato can turn yellow. This fungal disease which is easy for finding as except yellowness, leaves also lose turgor become sluggish as if they were not watered long ago. Against fusariosis it is better to carry out preventive measures. But if the disease has already begun, it is necessary to spray at an interval of 10-12 days bushes with antifungal biological products, such as Fitosporin and Fitotsid.