Tomato yellow and white seedlings are generally caused by iron deficiency. When iron deficiency, tomato leaves yellow and white, veins between the chlorosis, was reticular veins, severe yellow leaves, sometimes purple or pink, green leaves semi-negative necrosis, when the fruit is not mature and red Orange. The prevention measures are as follows:
The first is reasonable fertilization. Control the amount of phosphate fertilizer, zinc fertilizer, copper fertilizer, manganese fertilizer and calcareous fertilizer. For iron deficiency caused by potassium deficiency. Potassium can be used to relieve or even completely eliminate iron deficiency.
The second is to improve the soil, reduce the pH value of the soil, and increase the iron supply capacity of the soil.
The third is the application of iron fertilizer. Because iron deficiency often occurs in calcareous soils, soil fertilization is very inefficient because of the use of iron fertilizers. Therefore, foliar spraying methods such as foliar spraying of 0.2% to 0.5% inorganic iron or chelated iron can be used. Solution. Foliar can be added with appropriate amount of urea.
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