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通过培肥试验研究 ,建立坝地黄泥土玉米产量与施肥的数学模型 ,解析了氮肥、磷肥、堆肥及圈肥的效应及交互作用。优选出的施肥组合方案为 :施用尿素 2 1～ 2 4 kg/6 6 7m2 ,钙镁磷肥 0～7.5kg/6 6 7m2 ,堆肥 0～ 12 5kg/6 6 7m2 ,圈肥 937.5～ 112 5kg/6 6 7m2 ,可望获得≥ 50 0 kg/6 6 7m2 的玉米产量。土壤养分分析结果表明 ,只要施肥保持在零水平 (即每 6 6 7m2 施尿素 12 kg、钙镁磷肥 15kg、圈肥 12 50 kg)以上 ,就能在保持土壤目前养分水平的基础上逐步培肥 ,实现该类土壤生产力可持续发展。
Through the experiment of fertilizing, the mathematic model of corn yield and fertilization on yellow soil was established and the effects and interactions of nitrogen fertilizer, phosphate fertilizer, compost and circle fertilizer were analyzed. The optimal combination of fertilization was: 1-2 4 kg / 6 67 m 2 of urea, 0-7.5 kg / 6 67 m 2 of calcium magnesium phosphate, 0-125 kg / 6 67 m 2 of compost, 937.5-112 5 kg / 6 of compost 6 7m2, is expected to obtain ≥ 50 0 kg / 6 67m2 of corn production. Soil nutrient analysis showed that as long as fertilizer is kept at zero level (ie, urea is 12 kg per 667m2, 15kg for calcium magnesium phosphate and 125kg for stoma), it will be possible to gradually increase fertility while maintaining the current soil nutrient level, Achieve the sustainable development of soil productivity.