红壤柑桔园有机肥的施用量（指氮素）占总施肥量的一半左右是合适的。
Our study suggested that the optimum amount of organic fertilizer in the red soil citrus orchards was about half of annual nitrogen fertilizer.
采用二因素饱和D最优设计方法，对酒丢槽制作活性有机肥（以下简称活性有机肥）在水稻上进行了不同基肥和追肥施用量试验。
The optimal two-factor saturated D design was conducted to investigate effects of the active organic fertilizer made of grain stillage and other additives on rice yield.
研究牛粪堆制的有机肥不同施用量对观赏向日葵生长发育的影响。
The effects of cow dung composts used as base fertilizers on ornamental sunflower growth were studied.
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