以1983 ~ 1992年的田间试验结果和室内分析资料为依据，探讨了黄土丘陵区长期施用氮磷肥效应及平衡特征。
The effects and balance properties of long term nitrogen and phosphorous application in loessial hilly regions are explored in this paper based on field experiments and lab analysis from 1983 to 1992.
分别从氮肥效应试验、磷肥效应试验、钾肥效应试验和氮磷钾养分平衡进行了研究。
And study the nitrogenous fertilizer response trial, phosphorous fertilizer response trial, potassium fertilizer response trial and nitrogen, phosphorous, potassium nutrition balance separately.
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