施氮对半湿润农田夏玉米冠层氮素及叶绿素相对值(SPAD值)垂直分布的影响
시담대반습윤농전하옥미관층담소급협록소상대치(SPAD치)수직분포적영향
Effect of nitrogen on vertical distribution of canopy nitrogen and chlorophyll relative value (SPAD value) of summer maize in sub-humid areas
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