不同生育期积水对夏玉米生长和产量的影响试验

通过对拔节期和抽雄期田间不同积水深度和积水时间的试验,模拟研究夏玉米对不同洪涝灾害程度的耐受力和洪涝灾害对产量构成因素及最终产量的影响。结果表明：积水对夏玉米密度、绿叶数、果穗长、果穗粗和实产的影响较明显,而对发育期出现早晚和百粒重的影响不明显。拔节期积水5d以上,抽雄期积水7d以上,夏玉米基本绝收。玉米苗越小,耐洪涝的能力越弱。

Experiment for the Impact of Flood in Different Development Stages on Summer Maize Growth and Yields

The endurance of summer maize to floods and the impacts of the floods to maize yields and its components were studied through the experiment of different flood depth and time for summer maize in the jointing stage and tassel-ing stage. The results showed that flood had obvious impacts on the maize density, maize greenery, ear lengthen and thick, and the yields, but not on the development process and one hundred grains weight. It was no gains if flood continued more than 5days in jointing stage or more than 7days during tasseling stage. The endurance of younger maizes was weaker than old ones.