By field located experiment in semi-aired areas of loess plateau for successive 4 years with spring wheat, effects of N fertilizer and residual effect of N fertilizer on spring wheat was studied .
通过在黄土高原半干旱地区施用不同用量氮肥的田间定位试验，对春小麦四年连作条件下氮肥肥效和后效进行研究。
By field located experiment in semi-aired areas of loess plateau for successive 4 years with spring wheat, effects of N fertilizer and residual effect of N fertilizer on spring wheat was studied .
通过在黄土高原半干旱地区施用不同用量氮肥的田间定位试验，对春小麦四年连作条件下氮肥肥效和后效进行研究。
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