暖冬条件下播种密度和施氮水平对皖北地区小麦群体叶面积的影响
Journal of Anhui Agricultural Sciences(2010)
Abstract
[目的]研究暖冬条件下播种密度和施氮水平对皖北地区小麦群体叶面积的影响。[方法]设施氮水平和播种密度2个因素,均设4个水平。施氮量在165~255kg/hm2,基本苗在90万~270万/hm2。肥料运筹氮肥按基肥∶拔节肥∶孕穗肥=6∶2∶2,磷肥∶钾肥=1.0∶0.6进行,(NH4)2HPO4用量为225kg/hm2,K2SO4用量为135kg/hm2。磷钾肥分基肥、拔节孕穗肥按7∶3施用。[结果]暖冬年份生育后期小麦群体叶面积下降过快,容易早衰。所设定的中密中氮水平组合群体叶面积下降较慢,高效叶面积率、有效叶面积率高。[结论]该研究为实现暖冬趋势下小麦的高产稳产提供科学依据。
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Key words
North wheat area of Anhui Province,Decay rate of LAI,High-efficiency and valid leaf rate,LAI,Warm-winter
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