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(2) The application rate of late-maturing varieties of phosphate fertilizer (P 2 O 5 ) is 70-120 kg / ha; the suitable amount of early-maturing varieties is 50-80 kg / ha. The amount of phosphate applied depends on the amount of available phosphorus in the soil. Generally less than 0.90 - 1. 70 mg / kg, the recommended amount of phosphate fertilizer is 35 - 75 kg / ha (early maturing variety) or 50 - 100 kg / ha (late maturing variety); when the soil effective phosphorus content is 1.8 - 3.2 When the mg/kg is recommended, the recommended amount of phosphate fertilizer is not 35 kg/ha (early maturing variety) or 50 kg/ha (late maturing variety); when the soil available phosphorus content is greater than 3.2 mg/kg, it is possible to apply no phosphate fertilizer but less phosphate fertilizer.
(3) Potassium fertilizer (K ​​2 O ): 50-100 kg/ha for late-maturing varieties; 40-70 kg/ha for early-maturing varieties is suitable. The amount of potassium applied depends on the available potassium content of the soil. Less than 5. 0------- - 6.6 mg / kg, recommended potassium application rate is 25 - 50 kg / ha (early maturing variety) or 35 - 70 kg / ha (late maturing variety); when soil available potassium When the content is more than 6.6 mg / kg, potassium or less potassium may be applied.
(4) Application of lime (CaO): Strong acid soil requires lime powder below pH 5.0, preferably 2 to 3 tons per hectare. Fully mixed into the plough layer two weeks before sowing
(1) Nitrogen (N): The nitrogen application rate of spring maize is generally 150~200 kg/ha; the nitrogen application rate of summer maize is generally 120~160 kg/ha; the nitrogen application rate of edible sweet corn is 100~140 Kilograms/ha are suitable.
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