The reader asks: The upper leaves of the peanuts are yellowed, the veins are green, the severe veins are yellow, and the whole leaves are yellowed and white. What is the disease? How to prevent it?
According to the description, it can be judged as iron deficiency, which belongs to the initial or medium term. In severe cases, brown spots and tissue necrosis will appear on the leaves. If the timely and effective prevention and treatment is not obtained, the plants will have premature aging or even death. Generally, alkaline soils with high pH values ​​have more iron deficiency.
Control methods: 1. Spray method. The iron fertilizer currently applied can be divided into two types: inorganic iron fertilizer and chelated iron fertilizer. The inorganic iron fertilizer mainly includes ferrous sulfate and ammonium ferrous sulfate, and the method of foliar spraying is adopted, and the concentration is 0.2% to 0.5%. However, due to the small mobility of iron in plants and the easy oxidation of foliar spray, it is best to use chelated iron fertilizer. Mainly FeEDTA (iron diamine tetraacetate), FeDTPA (iron diethylene triammonium pentaacetic acid), FeEDDHA (ethylene diamine o-dihydroxyacetate), ammonium ferric citrate, urea iron, etc., the effect is better than inorganic iron fertilizer . In addition, if the foliar application of iron fertilizer can be combined with the addition of an appropriate amount of urea, the correction effect can be improved. 2. Spread the law. The acid organic fertilizer such as distiller's grains and vinegar grains may be mixed with inorganic fertilizers such as ferrous sulfate and sulfur powder, and the application may be carried out in the peanut field. 3. Casting. It can be watered with 150~200 times liquid vinegar, once every 10~15 days.
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