grain nitrogen rate 粒含氮率
straw nitrogen rate 秸秆含氮率
optimal nitrogen rate 适宜施氮量
mineralized nitrogen rate 矿化速率
A field experiment was conducted to study the effects of nitrogen rates on wheat grain yield and protein content and its physiological basis. The results showed that both wheat yield and protein content were improved with reasonable nitrogen rate.
在大田高产条件下研究了氮素水平对小麦籽粒产量和蛋白质含量的影响及其生理基础。
参考来源 - 期刊学术社区·2,447,543篇论文数据，部分数据来源于NoteExpress
Field experiment was carried out to study effect of different nitrogen rate on growth, yield and quality of flue-cured tobacco when applying green manure to soil.
采用田间小区试验研究了绿肥全部还田条件下不同施氮水平对烤烟生长发育以及烟叶产量、产值和品质的影响。
Research was conducted from 2002 through 2004 to evaluate the effects of variety, nitrogen rate, topping height, and separation of the upper-stalk tobacco at harvest on production of tip grades.
为了评估品种、氮用量、打顶高度和上部叶分次采收对生产顶叶等级的影响，从2002 - 2004年进行了研究。
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