The leaves of the corn are yellow and dull, which is caused by the lack of nitrogen in the corn and soil, or caused by pests and diseases. The long-term yellowing of corn leaves often leads to early reproductive growth, premature heading, and baldness. Corn plants produce “premature aging,†that is, corn plants mature prematurely and yield low. The measures to control corn yellow leaves are as follows:
1. Re-apply fertilizer water. For the yellow-leaf corn, the “five-stage topdressing method†is adopted, that is, the seedling fertilizer, the small bell mouth fertilizer, the big bell mouth fertilizer, the panicle fertilizer, and the grain fertilizer are applied, and the fertilization is carried out a small number of times to improve the fertilizer efficiency. In the seedling stage, 10 kg of urea is applied and 5 kg of potassium sulphate is applied; in the small bell mouth period, 15 kg of diammonium phosphate is applied , 10 kg of potassium sulfate , 2 kg of micro-fertilizer ; 2 kg of diammonium phosphate is applied in the large bell mouth period , sulfuric acid Potassium 15 kg, 3 yuan micro-fertilizer ; 10 kg of diammonium phosphate and 5 kg of potassium sulfate at the ear stage ; 2 kg of diammonium phosphate and 3 kg of potassium sulfate. If it does not rain after fertilization, it must be watered after 3 to 5 days of fertilization, fertilized with water, and promoted with water.
2, early prevention of disease and control of insects. According to the characteristics of the disease caused by yellow leaves and the occurrence of insects, the medicine is applied to the disease (worm), and the disease is not left.
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