Symptoms showed that when the peanut was deficient in iron, the upper leaves were chlorotic, while the lower old leaves and veins remained green. When the iron was severely deficient, the veins were chlorotic and yellow, and the upper new leaves all turned white, and brown spots were necrotic and dry. And shedding.
The control method can be sprayed with 0.1% to 0.2% ferrous sulfate solution, sprayed once every 5 to 7 days, and can be sprayed continuously for 3 to 4 times. To enhance the adhesion of the leaf surface, 0.1% can be added. Washing powder to enhance the spraying effect and enhance the absorption function of the foliage. It is also possible to use Lei Li yellow leaf enemy, whose main component is iron chelate and some trace elements. The spraying effect is better than the simple spraying of ferrous sulfate. Generally, 20 ml of water is used per acre, 15 kg, and sprayed every 10 days. Once, continuous spraying for 2 to 3 times works best.
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