Nitrogen using efficiency mainly relates with precipitation during crop growth stage.
氮素利用效率与作物生育期降水量有很大关系。
Choosing the appropriate crops to carry on intercropping may enhance the efficiency of crops using the nitrogen phosphorus.
选择合适作物种类进行间作，可提高作物对氮磷的利用效率。
High efficiency removal of organics and nitrogen by using a two stage SBR process was introduced in this paper.
采用两段SBR法处理有机物和氨氮含量较高的化工废水。
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