Summer maize fertilization should be controlled by “basic fertilizer and topdressing supplement; organic fertilizer in base fertilizer is mainly supplemented by chemical fertilizer, phosphorus and potassium fertilizer is mainly used as base fertilizer, and topdressing is applied in stages; base fertilizer is applied, seedling is applied early, and attacking fertilizer is emphasized.†And so on. N:P:K is preferably 1:0.5-0.8:0.5-0.8. Usually, the base fertilizer is 1500Kg of water dung, 5Kg of urea and 20Kg of superphosphate. The base fertilizer can be ploughed into the soil after being applied, or most of the application can be applied in a small part, or all the ditch or hole application. Fertilizers and foliar sprays are rarely used. Topdressing is divided into seedling fertilizer, jointing fertilizer, panicle fertilizer and grain fertilizer. After the seedlings are fixed, they will catch up with the organic fertilizer. In the 4-5 leaf stage, the seedlings will be applied to raise the seedlings, usually 1500-2000Kg of water manure and 10Kg of urea. In the soil where phosphorus and potassium are applied effectively, some phosphorus and potassium fertilizers can be applied at a discretion. . When the seedling growth is normal, the panicle fertilizer is applied again, and in the case of insufficient fertilizer, the panicle fertilizer is concentrated in one time. The grain fertilizer is applied at the time of tasseling, and the effect of increasing yield is obvious. After the corn is flowering, the phosphate fertilizer can be sprayed outside the root. Usually, the leaching solution is clarified with 0.4-0.5% potassium dihydrogen phosphate solution or 3-4% calcium superphosphate. The dosage per acre is about 75-100Kg, sprayed on the stems and leaves. On, the effect is obvious.
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