Summer maize has a short growth period, rapid growth and development, and the peak of nutrient absorption is early and concentrated. Therefore, according to the growth of summer corn and special rules of sucking fertilizer, nitrogen fertilizer should be applied to the base fertilizer, pay attention to seedling fertilizer and jointing fertilizer, storming panicle fertilizer, phosphorus and potassium fertilizer should be used as a base fertilizer early application. If the summer corn cannot be applied to the basal fertilizer due to seeding, the basal fertilizer may be added to the former crop and the subsequent effect may be used. The specific fertilizing amount is as follows: The plots are larger than 500 kilograms of land, urea 35-38 kilograms, 20-23 kilograms of superphosphate, 400-500 kilograms of land, and 25-35 kilograms of urea. Superphosphate 17-20 kg; 300-400 kg per mu plot, urea 17-24 kg urea, heavy calcium superphosphate 12-17 kg. For a plot with a yield of more than 400 kilograms per mu, 12-16 kg of potassium sulphate should be added per acre. In addition, when the nitrogen, phosphorus, and potassium nutrients are insufficient in the later corn growth stage, 1 kg of urea and 0.1 kg of potassium dihydrogen phosphate may be used during the grain filling period (or 1 to 2.5 kg of superphosphate may be filtered out after 24 hours, potassium chloride may be filtered out. Potassium sulphate 0.5 kg), spraying 50-60 kg of water. When zinc deficiency, available zinc fertilizer 0.1-0.15 kg, 60-75 kg of water, spray. Spraying time is good for sunny days. If it is in the hot sun, it should be sprayed after 3 pm. Rainy weather should be applied after the leaves are slightly dry after the rain. Pay attention to the application of fertilizer solution.
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