Peanut defertilization or leaf spot disease, if not timely supplement fertilizer or disease prevention, can easily cause peanut leaves. As the saying goes, Ye Mao was strong and strong. Therefore, if peanuts do not fall off, they must be protected against diseases and supplement fertilizers.
Leaf spot disease. In the late growth period of peanuts, the leaf spot that damages leaves caused by defoliation mainly includes brown spot and net spot disease. 80% of mancozeb 800 times and 70% thiophanate-methyl 800-1000 times can be used in the early stage of disease. 50% Benzoate (Benzoxacillin) WP 1500 times, 50% carbendazim 800-1000 times spray control. Spraying should pay attention to spray evenly, spray thoroughly, prevent leakage spray, spray once every 8-10 days, even spray 3-4 times.
Foliar spraying fertilizer. When peanuts reach the late growth stage, the ability of roots to absorb nutrients from soil and the ability of root nodules to fix nitrogen begin to weaken, while foliar spray fertilizers can supplement nutrients and prevent premature defoliation. Earthy sand, thin soil, lack of base fertilizer, short plants, weak growth, yellowing of the leaves with defertilization phenomenon, can use 1% of urea water spraying. Peanut leaves have a strong absorption capacity for phosphorus. In the middle and late stages of growth, spraying 2%-3% of superphosphate calcium leachate per acre (filtered for 14-16 hours) 60 kilograms, spraying once every 7-10 days. Even spray 2-3 times, or use 100-150 grams of potassium dihydrogen phosphate, 50 kilograms of water, fully dissolved after spraying in the evening or cloudy afternoon, spray once every 7 days, even spray 3 times, if sprayed Rain in 8 hours, re-spray 1 time. Peanut is extremely sensitive to iron, and it is planted on alkaline soil. It is prone to iron deficiency. It shows symptoms of yellow leaves and albinism. It must be sprayed with iron fertilizer in time. It can be sprayed with 0.2% ferrous sulfate solution and sprayed every 5-6 days. Once, spray 2-3 times.
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