Tomato yellow and white seedlings are generally caused by iron deficiency. In the absence of iron, the leaves of the top of the tomatoes are yellow and white, and the veins are chlorogenic. They are reticular veins. In severe cases, the leaves are yellow and white, and sometimes they are purple or pink. Most of the chlorotic leaves are necrotic. The fruits are not red and orange when they ripen. 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, iron deficiency can be relieved or even completely eliminated by adding potassium fertilizer.

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 disease often occurs in calcareous soil, iron fertilizer applied to the soil can be easily oxidized and ineffective. Therefore, foliar spraying methods can be used, such as spraying 0.2% to 0.5% of inorganic iron or chelated iron. Solution. Foliar can be added with appropriate amount of urea.

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