土壤供氮状况是判断土壤肥力的一项重要指标。
The supply condition of nitrogen is one of the important targets to judge the fertility in soils .
土壤氮状况是一个固氮、微生物分解、硝酸化和脱氮过程的作用。
The soil nitrogen status is a function of the processes of nitrogen fixation, microbial decompostion, nitrificattion and denitrification.
在不同土壤水氮条件下，研究了小麦中后期叶片碳氮状况及其比例与冠层光谱反射特征的关系。
The research was conducted to determine the relationships of sugar and nitrogen status and its ratio in wheat leaves to canopy spectral reflectance under different nitrogen and water supply levels.
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