Peanuts are one of the most sensitive crops to iron. When peanuts were iron-deficient, they first showed chlorosis of the upper young leaves, while the old leaves and veins of the lower part remained green. When iron is severely deficient, the veins lose their greenness and yellow. All the new upper leaves turn white, brown spots and tissue necrosis occur in the leaves for a long time. If they are not timely and effectively prevented, premature death or death will occur. The alkaline soils with higher pH generally have more iron deficiency. July-August is the period when the growth of peanuts is most prosperous. If there is more rain, peanuts are the most susceptible to iron deficiency yellowing.
Compared with chlorosis caused by nitrogen deficiency and zinc deficiency in peanuts, iron deficiency chlorosis in peanuts is characterized by no obvious change in leaf size and significant chlorotic chlorosis. The lack of nitrogen caused by yellowing and chlorosis often leaves thin and small plants. Zinc deficiency can easily cause large clusters of leaves and yellow-white lobulation. To accurately identify whether a peanut plant is deficient in yellowing iron deficiency, apply 0.1% ferrous sulfate solution to the chlorosis area on the back of the leaf. If it turns green after 5-8 days, it can be confirmed as iron deficiency.
The prevention and treatment of iron deficiency and yellowing in peanuts is currently the most common use of ferrous sulfate spraying. Generally, 0.2%-0.5% ferrous sulfate solution can be sprayed on the leaves, sprayed once every 5-7 days, and sprayed 3-4 times.
In addition, there is a product called “Yellow Leaf Ling†on the market. The main component of the product is organic chelated iron, which has quick effect and high utilization rate. Its spraying effect is obviously better than that of ferrous sulfate. Foliage spray iron fertilizer if you can add appropriate amount of urea, can improve the effect of correction.
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