施肥量
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N fertilizer application rates 氮肥梯度
different fertilizer application rates 不同施肥量
phosphate fertilizer application rates 磷肥用量
The yield increase of K fertilizer was quite high at two rates of nitrogen application, and it closely relative to the content of available K in soil and potassium application rate.
钾肥的增产效率在两种氮肥水平下都较高，单位钾肥的增产量与土壤有效钾含量及施钾量呈极显著负相关；
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