This spring, a federal science advisory report is expected to recommend a national goal of improving the efficiency of farm nitrogen fertilizer use by 25 percent, Herz and Galloway say.
今年春天，一份联邦科学建议报告有可能建议提高氮肥使用率提高25%的国家目标。赫兹和盖洛韦说。
Fertilizer use efficiency will decrease when nitrogen and phosphor are increased.
而增加氮、磷投入亦能提高水分利用效率。
Under different soil conditions, there were significant genotypic differences in effects of applying nitrogen fertilizer on nitrogen use efficiency, yield and characters of nitrogen uptake.
在不同土壤条件下，水稻施用氮肥的增产效应、氮肥利用效率和对氮素的积累与分配均存在显著的基因型差异。
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