Basic fertilizer: Spring corn is mainly based on fertilizer, supplemented by top dressing; farm fertilizer is mainly used, fertilizer is supplemented; nitrogen fertilizer is mainly used, phosphate fertilizer is supplemented; ear fertilizer is mainly used, and grain fertilizer is supplemented.
Base fertilizer should generally account for about 70% of the total amount of fertilizer applied, and most phosphate fertilizers should also be applied in combination with base fertilizer, generally in the previous year in combination with autumn tillage. When applying base fertilizer, it should be evenly mixed with the soil, generally 37.5 to 60 tons of farm fertilizer per hectare of base fertilizer. If nitrogen fertilizer is used as base fertilizer, 375 kg of ammonium carbonate or 150 kg of urea can be applied per hectare. Must be applied deeply to prevent the loss of nitrogen volatilization. In phosphorus-deficient soils, 450 to 600 kg of calcium per hectare is applied; in potassium-deficient soils, 150 kg of potassium chloride is applied per hectare; in zinc-deficient soils, 15 kg of zinc sulfate heptahydrate is applied per hectare.
Seeding fertilizer: Before spring sowing, use a small amount of farm manure and mix with appropriate amount of nitrogen and phosphate fertilizers for strip or hole application as corn seed fertilizer.
Topdressing: Topdressing corn is an important measure for high-yield cultivation of corn. Because spring corn has a long growth period, grows slowly at the seedling stage, and absorbs less nutrients, the spring corn top dressing mostly uses the "first light and then heavy" fertilization method, that is, 1/3 of top dressing is applied before corn jointing, per hectare Apply 75-150 kg of urea, apply 2/3 of the top dressing at the big trumpet stage, and apply 150-300 kg of urea per hectare to meet the nutrient requirements of spikelets, florets differentiation and grain formation stage of maize ears, experimental results It was confirmed that the spring maize fertilization method using "front light and heavy weight" increased the yield by 13.3% compared with the fertilization method using "front heavy and light weight".
Source: agricultural Guide 2009 14 Author: stone products
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