超高产春玉米根冠衰老特性及对密度的反应机理

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【摘要】

：

增密是实现春玉米超高产的基本条件,但增密又加剧了玉米个体的衰老进程,而果穗大小不同的品种对增密的反应不同。试验选用高秆大穗型和中秆中穗型两种穗型品种,在不同种植密度(7.5-12.0万株/hm~2)条件下,从根冠两个方面探索超高产春玉米的衰老特性。试验结果如下:1.不同种植密度处理下,超高产春玉米花粒期不同层位叶片间表现为下位叶衰老早于上位叶和穗位叶,穗位叶衰老速度最慢;不同土层根系衰老均呈现空间

【作者】

：

王海燕

【机构】

：

内蒙古农业大学

【发表日期】

：

2011年01期

【关键词】

：

超高产春玉米根冠衰老种植密度

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超高产春玉米根冠衰老特性及对密度的反应机理

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