The SPAD-502 chlorophyll meter appears promising for rapid, on-farm analysis of crop nitrogen status.
叶绿素仪（SPAD-502）的出现使通过无损伤的田间速测对作物进行氮营养诊断成为可能。
Many researches have shown the correlations between nitrogen status and growth rate, photosynthesis, and performances of shoots and roots of plants.
许多研究成果指出，植物体含氮量与生长速率、光合作用速率与地上部及地下部形态具有相关性。
The RING-like ubiquitin E3 ligase of the present invention is involved in mediating nitrogen limitation adaptive responses in plants and its expression is influenced by nitrogen status.
本发明的RING样遍在蛋白E3连接酶参与介导植物中的氮限制适应性应答，且其表达受氮状态的影 响。
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.
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.
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。
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