群体结构对夏玉米光合特性及物质积累的影响

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于2008年—2009年6~10月选用河南省生产上大面积推广的玉米品种郑单958为试验材料,在大田试验条件下采用三因素裂裂区试验设计,研究了不同种植密度、不同种植方式、不同留苗方式条件下,所构造的不同群体结构对夏玉米冠层结构特点、冠层小气候特点、光合特性、叶绿素荧光特性、物质积累及产量的影响,主要研究结果如下:为从群体数量上确定适宜的群体结构,2008年设置45000、60000、75000、90000、105000、120000株?hm-2六个种植密度。试验结果表明,几个群体指标,如:
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