Basal fertilizers should generally account for about 70% of the total amount of fertilizers. Most of the phosphate fertilizers should also be applied in combination with basal fertilizers. Generally, they are used in combination with autumn ploughing in the previous year. When the basal fertilizer is applied, it should be evenly mixed with the soil. Generally, 37.5 to 60 tons of fertilizer is applied to the basal fertilizer per hectare. If nitrogen fertilizer is used as a base fertilizer, 375 kg of ammonium bicarbonate or 150 kg of urea can be applied per hectare. Be sure to deepen it to prevent loss of nitrogen volatilization. In phosphorus-deficient soils, 450-600 kg of calcium sulfate is applied per hectare; in potassium-depleted soil, 150 kg of potassium chloride is applied per hectare; in zinc-deficient soil, 15 kg of zinc sulfate is applied per hectare.
Fertilizer: Before spring sowing, a small amount of farmyard manure is used to match the appropriate amount of nitrogen and phosphating fertilizers or applied as a corn seed fertilizer.
Top dressing: Corn dressing is an important measure for the cultivation of high yield corn. Due to the long growth period of spring maize, slow growth at seedling stage, and less absorption of nutrients, spring corn is topped with fertilizers in the form of “pre-light weight and heavy weightâ€, ie 1/3 of top dressing is applied before jointing of corn. Apply 75-150 kg of urea, apply 2/3 topdressing at the big bell mouth, and apply 150-300 kg of urea per hectare, which meets the needs of nutrients for spikelets, floret differentiation and grain formation stages of maize ears. It was confirmed that the method of fertilizing the former light and heavy weight of the spring corn was 13.3% higher than that using the “pre-heavy and light†fertilization method.
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