First, the principle of fertilization: During the whole growth period of corn, the absorption of pure n2.57kg, p2o50.86kg, and k2o2.14kg is required for each 100kg of grain, and the absorption ratio of nitrogen, phosphorus and potassium is 3:1:2.5. According to the city's soil monitoring situation in recent years, the city has a high content of soil organic matter, and the soil has a strong fertilizer and water retention capacity. The potential for corn production is almost 500 kg or more. To achieve a target output of 500-600 kg, organic fertilizer is applied per acre. 2000-3000 kg of fertilizer, 35-45 kg of urea, 40-50 kg of superphosphate, 15-25 kg of potassium chloride, 2-3 kg of zinc sulfate, and 1-2 kg of borax. Second, fertilization methods: Organic fertilizer, phosphorus and potassium fertilizer, zinc and boron fertilizer should be applied at the time of sowing or seedling. Nitrogen fertilizers should be applied at a rate of 30-40% for seedlings (including seed and seedling) and 60-70% for panicles (55-60% for leaf age, ie 11-12 leaflets). Individual high-yield fields can quickly extract 20% of nitrogen fertilizer from panicle fertilizer and then apply the attacking grain fertilizer after tasseling. If corn is used as a base fertilizer, if a certain nutrient is insufficient, use simple fertilizer to supplement it. Corn is sensitive to potassium and zinc fertilizers. According to surveys, most of the grain fields in our city lack potassium and zinc deficiency. Therefore, we should pay attention to increasing potassium fertilizer and zinc fertilizer. Conditional, it is best to carry out balanced soil fertility formula. Third, pay attention: When applying fertilizer, it must be planted, fertilizer isolation, to prevent burning.
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