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1试验目的由于磷素在土壤中易固定、流动性差,因此相对氮肥而言,磷肥被作物吸收利用一直比较低。大量施用,不仅会增加生产成本,而且会增加土壤及环境污染风险。如何改进施肥方法,在满足作物对养分需求的前提下,明显提高肥料利用率,特别是磷肥的利用率,降低棉花生产成本,提高种植效益,基于此种设想,本试验将基肥施用方法由全层施肥改为定位施肥,通过对目前铺膜播种机械的改造,改装施肥设备,在播种的同时将肥料直接施于棉花根系密集的区域,从而提高肥料利用率,特别是磷肥利用率。
1 Test Purposes Because phosphorus is easy to fix in the soil, poor liquidity, so relative to nitrogen fertilizer, phosphate fertilizer has been absorbed by the crop has been relatively low. Large-scale application will not only increase the production cost, but also increase the risk of soil and environmental pollution. How to improve the fertilization method, under the premise of meeting the nutrient requirements of the crop, obviously improve the fertilizer utilization rate, especially the utilization rate of the phosphate fertilizer, reduce the cotton production cost and improve the planting efficiency. Based on this assumption, Layer fertilization instead of positioning fertilization, through the transformation of the current film sowing machines, modification of fertilization equipment, at the same time sowing the fertilizer applied directly to the cotton root dense areas, thereby increasing fertilizer utilization, especially phosphorus utilization.