Late growth of peanuts should prevent premature leaf aging
At the late stage of growth, no new leaves were added, and the lower and middle leaves began to fall off. The focus of field management is to prevent premature leaf failure, especially the upper leaves, maintain a larger area of ​​green leaves, maintain a longer functional period, increase the degree of solidity, and increase yield.
The main causes of premature aging of peanut leaves are: premature degeneration of defertilizer and more serious sand; the harm of leaf spot, especially black spot and brown spot, will spread quickly once it occurs, often causing a large number of leaves to fall off within a few days. Premature and excessive spraying of plant growth regulators, especially Pyrazole and paclobutrazol, and regulators containing this ingredient as the main ingredient are more serious. The main measure for preventing early defoliation is preventing disease and supplementing fertilizers.
Prevention of leaf spot leaf spot disease is mainly caused by black spot and brown spot. Both diseases are mainly damaged leaves. The onset of peanuts begins with symptoms from the lower leaves and gradually spreads to the upper leaves. Brown spots develop in the early stages of the disease and gradually develop into round or irregular lesions. The spot of brown spot is larger, yellow halos surround the lesion, and the spot of black spot is smaller, the color is lighter than brown spot, and the edges are neat, there is no obvious halo. The weather is humid or long-term rainy, the lesions can be combined with each other into irregular large spots, the leaves scorch, seriously affecting photosynthesis. If it occurs on the petiole, stem or fruit pin, it will produce oval dark brown or brown spots, while the whole stem or fruit pin will turn black and die, causing the peanut production to drop significantly. From the peanut to the late growth stage, there are many kinds of leaf spot that damage the leaves caused by early defoliation. It is mainly brown spots and net spot disease that are harmful and hard to control. Can be sprayed at the early stage of the disease. The commonly used pharmaceuticals include: 80% of mancozeb 800 times, 70% thiophanate-methyl 800-1000 times, and 1:2:200 times of Bordeaux mixture. Spraying should pay attention to spray evenly, spray thoroughly, to prevent leakage of spray, spray once every 8-10 days, and even spray 3-4 times, can basically control the occurrence of the disease.
Foliar sprayed peanuts to the late growth stage, the ability of roots to absorb nutrients from the soil and the ability of root nodules to fix nitrogen began to weaken, but the ability of the leaves to absorb nutrients was increasing. Foliar spray fertilizer supplement has many advantages such as rapid absorption, rapid action, and high utilization rate. It is a good measure to prevent early decending caused by premature senescence. Earthy sand, thin soil, lack of base fertilizer, short plants, weak growth, yellow leaves with deferring phenomenon of peanut, 1% urea solution can be used for foliar spray. Miaowang Zhujian has a tendency to grow mad, but it is not necessary to spray urea. Peanut leaves have a strong absorption capacity for phosphorus. During the middle and late stages of growth, spraying 2%-3% of superphosphate calcium leachate per acre (filtering for 14-16 hours) 60 kg, spraying once every 7-10 days. , spray 2 or 3 times, or use 100-150 grams of potassium dihydrogen phosphate per acre, 50 kg of water, and spray it in the evening or cloudy afternoon after fully dissolved. It is best to spray 3 times, each time. Days, if it rains within 8 hours after spraying, re-spray it once.
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