Prevent peanuts from falling into early leaves
Causes of early defoliation of peanuts are mainly due to: premature decompensation, sand more land is more serious; leaf spot damage, especially black spot and brown spot, once the spread of rapid, often within a few days caused a large number of leaves off Premature and over-spraying of conditioners, especially Pyrazole and paclobutrazol, and conditioners containing this ingredient as the main ingredient are more severe. Prevention of early fall leaves can take corresponding measures for different reasons. The main measures are: Pay attention to the prevention of leaf spot leaf spot disease mainly to black spot and brown spot disease, both diseases are mainly harm the 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. In the early stage of disease, it can be sprayed 3-4 times with 80% mancozeb or 600-800 times at intervals of 8-10 days. It can also spray 70% thiophanate-methyl 800-1000 times or other new bactericide. Note that foliar sprayed peanuts have reached their late growth stage. The ability of roots to absorb nutrients from the soil and the ability of root nodules to fix nitrogen have begun to weaken, but the ability of the leaves to absorb nutrients has increased. 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. Foliage dressing is a fertilization method often used in production. Here is a description of fertilizers suitable for topdressing of peanuts and their application methods: Foliar spraying can be performed with 1% urea solution. Peanut leaves have a strong ability to absorb phosphorus. In the middle and late stages of growth, they use 2%-3% of superphosphate calcium leaching solution 60kg every 7-10 days to spray once every 667 square meters, and spray 2-3 times. Accelerate the speed of the photosynthetic product to the pods. Potassium dihydrogen phosphate. For every 667 square meters of potassium dihydrogen phosphate 150-200g, water 50kg, to be fully dissolved after spraying in the evening or cloudy afternoon, it is best to spray three times, each time interval of 7 days; if the inner 8 hours after spraying Rain, re-spray 1 time, can increase 18.2% -26.9%. The application of iron fertilizer on iron-deficient soil can increase production by more than 10%. Usually in the peanut flowering stage, the scarring stage or when the plants have iron deficiency symptoms, spray 0.2% ferrous sulfate solution every 5-6 days, and spray 2-3 times continuously. Mw Infrared Detectors,Mwir Detector,Infrared Heat Detectors,Infrared Metal Detector Shandong Freedom Technology Co.,Ltd , https://www.sdfreedomtech.com