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基于连续进行33年的长期定位试验,利用15 N示踪,研究长期施用化肥对冬小麦-夏玉米轮作中氮吸收利用的影响。结果表明,长期氮磷肥配施氮素利用率最高,为55.63%,与对照相比较提高了13.2%;其次为氮磷钾肥配施,氮素利用率为55.21%;氮磷钾肥配施处理氮素损失率最低,为8.71%。长期单施氮肥和氮钾肥配施的处理氮素利用率最低,分别为36.21%、34.53%,损失率高达38.63%、38.31%。
Based on the continuous 33-year long-term experiment, the effect of long-term application of chemical fertilizers on nitrogen uptake by winter wheat-summer maize rotation was studied by 15 N tracing. The results showed that the long-term application of nitrogen and phosphorus fertilizers nitrogen utilization was the highest, 55.63%, compared with the control increased by 13.2%; followed by the NPK fertilization, nitrogen utilization was 55.21%; NPK fertilizers applied nitrogen The lowest rate of prime loss, 8.71%. Long-term single application of nitrogen fertilizer and nitrogen and potassium fertilizer treatment nitrogen utilization rate of the lowest, respectively, 36.21%, 34.53%, the loss rate as high as 38.63%, 38.31%.