Peanut leaf yellowing In recent years, in the production of peanuts, the phenomenon of yellowing of peanut leaves caused by rainfall or irrigation has generally occurred, and has become one of the major factors affecting peanut production, generally resulting in a 15%-30% reduction in peanut production. Block production can reach 50%-70%.
Symptoms
Peanut leaf yellowing is mainly manifested in the following three symptoms: First, iron deficiency yellowing. Generally, the upper young leaves become chlorotic, while the old leaves and veins in the lower part remain green. When they are severe, the leaf veins become green and yellow, and the upper new leaves are all white, causing brown spot necrosis and desiccation; iron deficiency yellowing, Generally, the size of peanut leaves did not change significantly, but the chlorotic chlorosis was obvious. The second is the lack of nitrogen yellowing. Deficiency of nitrogen caused by the chlorosis of yellow leaves of peanuts, first of all, the old leaves of the lower part of the plant chlorosis, generally also shows thinning leaves, smaller, short plants, generally barren, wheat and summer live peanuts susceptible to nitrogen deficiency Change. The third is the lack of zinc yellowing. Zinc deficiency caused by the yellow leaves of peanuts, the general performance of the leaves cluster, the emergence of yellow-white lobular disease.
Control methods
The prevention and treatment of iron deficiency and yellowing in peanuts is currently the most common method for spraying ferrous sulfate on leaves. Generally, 0.1%-0.2% ferrous sulfate solution can be sprayed on the leaves and sprayed once every 5-7 days. Spray 3-4 times, in order to enhance the adhesion of the foliage, you can add 0.1% neutral laundry detergent to improve the spraying effect and enhance the absorption of the foliage. It is also possible to use green leaves and other preparations that use iron chelate as the main component and add some trace elements. For iron deficiency, lack of zinc and yellowing mixed land, can be iron deficiency, lack of zinc and defense, generally available per gram 150 grams of ferrous sulfate and zinc sulfate 50 grams, 60 kg of water, foliar spray. To prevent nitrogen deficiency and yellowing, appropriate amount of topdressing nitrogen fertilizer can be applied before watering or rainfall, and the top-dressing inconvenient plots can be sprayed with about 1% urea aqueous solution, which can effectively relieve the symptoms of yellowing.
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