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当前我省棉田施肥的特点是,大量施用氮化肥,亩平折N素25—35斤,有机肥和磷钾肥的施用较少,棉田偏施重施氮肥,造成了两个不良后果:一是土壤养分不平衡,棉花对磷钾的需求得不到满足,另外棉田有机质消耗长期得不到补充,土壤肥力下降。其结果是棉花病虫害多,产量徘徊.氮肥经济效益也得不到充分发挥。因此从经济施肥和培肥地力的观点出发,我们对有机无机氮肥配合施用对棉花氮素养分的吸收和产量的影响进行了初步研究。
At present, the province’s cotton fertilization is characterized by a large number of application of nitrogen fertilizer, N flat-folded 25-35 pounds of N, organic fertilizer and phosphorus and potassium less application of cotton partial heavy nitrogen fertilizer, resulting in two adverse consequences: First, Unbalanced soil nutrients, cotton, phosphorus and potassium demand can not be met, another long-term lack of organic cotton consumption to supplement, soil fertility decline. The result is more cotton pests and diseases, production hovering .Nitrogen economic benefits have not been fully realized. Therefore, from the perspective of economic fertilization and fertility enhancement, we conducted a preliminary study on the effects of combined application of organic and inorganic nitrogen fertilizers on the absorption and yield of cotton nitrogen.