The reader asks: The upper leaves of peanuts are yellowing, the veins between the veins are green, the severe veins are also yellow, and the entire leaf yellows and turns white. What kind of disease is this disease? How to prevent it?
According to the description, it can be judged as iron deficiency, which belongs to the early or middle period. In severe cases, brown spots and tissue necrosis appear on the leaves. If timely and effective prevention and treatment is not achieved, the plant will experience premature aging and even death. The alkaline soils with higher pH generally have more iron deficiency.
Control methods: 1. Spray method. Currently applied iron fertilizer can be divided into inorganic iron fertilizer and chelated iron fertilizer. Inorganic iron fertilizers mainly include ferrous sulfate and ferrous ammonium sulfate, etc., and the method of foliar spraying is used, and the concentration is 0.2% to 0.5%. However, due to the less mobility of iron in plants and the easy oxidation of foliar sprays, it is best to use chelated iron fertilizers. Mainly include FeEDTA (iron ethylenediaminetetraacetate), FeDTPA (iron diethylene triammonium pentaacetic acid), FeEDDHA (iron ethylenediamine o-dihydroxyacetate), ferric ammonium citrate, urea iron, etc. The effect is better than inorganic iron fertilizer. . In addition, if the amount of urea can be added with the foliar spray of iron fertilizer, the curative effect can be improved. 2. Salting method. Distillers grains, vinegar grains and other acidic organic fertilizers may be mixed with inorganic fertilizers such as ferrous sulfate, sulfur powder, etc., and may be applied in a peanut field. 3. Pouring. 150 to 200 times liquid vinegar can be used for irrigation, once every 10 to 15 days.
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