Tomato yellow and white seedlings are generally caused by iron deficiency. In the absence of iron, the leaves of the top of the tomato were yellow and white, and the veins were chlorotic. They were reticular veins. In severe cases, the leaves were yellow and white, and sometimes they were purple or pink. Most of the chlorotic leaves were necrotic. When the fruits matured, they were not red but orange. The prevention measures are as follows:
The first is to improve the soil, reduce the soil pH, and increase the iron supply capacity of the soil.
The second is the application of iron fertilizer. Since iron deficiency often occurs in calcareous soils, soil fertilization can be easily oxidized and ineffective. Therefore, foliar spraying methods such as foliar spray of 0.2% to 0.5% of inorganic iron or chelated iron can be used. Solution. Foliar can be added with appropriate amount of urea.
The third 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, iron deficiency can be relieved or even completely eliminated by adding potassium fertilizer.
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