1. Characteristics of fertilizer requirement: The most nitrogen absorbed by corn during the whole growth period is followed by potassium and phosphorus. For the absorption of nitrogen, 85% of total nitrogen has been absorbed before heading for fertilization. For the absorption of phosphorus, 70% has been absorbed before heading. For the absorption of potassium, more than 70% has been absorbed before heading, and the remaining 30% is absorbed during heading and fertilization. Therefore, potassium fertilizer is generally applied in the early stage of fertility. The use of straw directly in the field for corn-based fertilizer has a good effect. In soils with low soil fertility, a small amount of nitrogen fertilizer should be used in the application of straw to adjust the carbon-nitrogen ratio and accelerate the decomposition of straw.
2. Fertilization technology: The fertilization amount of spring maize in the whole fertility cycle of medium fertility is 1500-2000 kg (or commercial organic fertilizer 250-300 kg), nitrogen fertilizer 15-17 kg, phosphate fertilizer 4-5 kg, potassium fertilizer 8- 9 kilograms. Nitrogen fertilizer, potassium fertilizer base fertilizer and two top dressings, phosphate fertilizers are all used as base fertilizer, and fertilizer and farmyard manure (or commercial organic fertilizer) are mixed. Base fertilizer: 1500-2000 kg of farmer's fertilizer or 250-300 kg of commercial organic fertilizer, 5-6 kg of urea, 9-11 kg of diammonium phosphate, 5 kg of potassium chloride, and 1-2 kg of sulfuric acid per mu of zinc-deficient soil Zinc. It is recommended to apply long-acting fertilizers to promote straw fertility. Top dressing: small trumpet period topdressing: 14-15 kg of urea and 7-8 kg of potassium chloride. Topping during the big bell period: 8-9 kg of urea and 4-5 kg ​​of potassium chloride. Top dressing: There is no zinc in the base fertilizer. The seeds can be treated with 0.02-0.05% zinc sulphate solution for 12-24 hours. The seeds are mixed with 2-3 g of zinc sulphate and a small amount of water. Uniform, foliar spray can be sprayed with 0.05-0.1% zinc sulphate solution at the seedling stage or jointing stage. The boron-deficient boron-boron fertilizer is soaked and immersed in a 0.01-0.05% boric acid solution for 12-24 hours.
2. Fertilization technology: The fertilization amount of spring maize in the whole fertility cycle of medium fertility is 1500-2000 kg (or commercial organic fertilizer 250-300 kg), nitrogen fertilizer 15-17 kg, phosphate fertilizer 4-5 kg, potassium fertilizer 8- 9 kilograms. Nitrogen fertilizer, potassium fertilizer base fertilizer and two top dressings, phosphate fertilizers are all used as base fertilizer, and fertilizer and farmyard manure (or commercial organic fertilizer) are mixed. Base fertilizer: 1500-2000 kg of farmer's fertilizer or 250-300 kg of commercial organic fertilizer, 5-6 kg of urea, 9-11 kg of diammonium phosphate, 5 kg of potassium chloride, and 1-2 kg of sulfuric acid per mu of zinc-deficient soil Zinc. It is recommended to apply long-acting fertilizers to promote straw fertility. Top dressing: small trumpet period topdressing: 14-15 kg of urea and 7-8 kg of potassium chloride. Topping during the big bell period: 8-9 kg of urea and 4-5 kg ​​of potassium chloride. Top dressing: There is no zinc in the base fertilizer. The seeds can be treated with 0.02-0.05% zinc sulphate solution for 12-24 hours. The seeds are mixed with 2-3 g of zinc sulphate and a small amount of water. Uniform, foliar spray can be sprayed with 0.05-0.1% zinc sulphate solution at the seedling stage or jointing stage. The boron-deficient boron-boron fertilizer is soaked and immersed in a 0.01-0.05% boric acid solution for 12-24 hours.
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