Black-skin gourd is likely to appear yellow leaves after flowering and squashing. It appears golden yellow from the leaves to the parietal lobe. It is the black-skin gourd that infects yellow leaf disease and is a physiological disease. It lacks calcium, magnesium and zinc. Manganese, iron, boron, molybdenum and other trace elements caused by. High-temperature drought and continuous cropping of melons are serious because high-temperature and dry weather affect the absorption of trace elements in the roots. After many years of cultivation of melon black melon, the trace elements in the soil are consumed in large quantities, resulting in the lack of trace elements in the soil. After black squash infecting yellow leaf disease, growth declines, and young larvae do not fully inflate, grow abnormally, yield is low, and quality is poor. Therefore, the cultivation of black melon should pay attention to the supplement of trace element fertilizers to prevent the appearance of leaf yellowing. Specific approach: When the black melon starts budding and flowering, apply a trace element fertilizer, and apply 8-10 kilograms of trace element fertilizer per acre, such as Shi Han and Ou Shen or Xing Peng Kalisu, against fresh water or biogas slurry. After 80-100 times of decomposing human and animal manure water, evenly applied in the soil surrounding the roots of the plants, it is better to completely penetrate the soil without flowing through the soil. Or spread the trace element fertilizer evenly in the soil around the root of the plant, and then apply a layer of soil about 5-6 cm thick to cover the trace element fertilizer. At the same time, once every 7-10 days, foliar spray once 600 times amino acid compound micronutrient fertilizer solution, or 0.1% Han and cubic calcium magnesium solution, or 800 times amino acid trace element water soluble fertilizer solution, spray evenly 2-3 times, evenly spray Wet all the leaves to supplement various trace elements from the foliage to ensure the supply of trace elements.
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