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

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。

Effects of Sowing Density and Nitrogen on Wheat Population LAI in the North Area of Anhui Province, in Warm-winter

Objective]The research aimed to study the effects of sowing density and nitrogen on wheat population LAI in the north area of Anhui Province in warm-winter.Method]The test designed 2 factors of density and nitrogen with 4 levels respectively.The nitrogen application amount was 165-255 kg/hm2,and the basic seedling was 900 000-2 700 000/hm2.The ratio of basal,elongation and booting N fertilizer application was 6:2:2.The application amount of (NH4)2HPO4 was 255 kg/hm2 ,and the application amount of K2SO4 was 135 kg/hm2.The ratio of basal and elongation and booting P and K fertilizer were both 7:3.Result]In warm-winter,wheat population LAI in later period declined quickly and wheat population tended to premature senility.The population LAI of those treatments of medium density level and medium nitrogen level in the test declined slowly and high-efficiency and valid leaf rate were high.Conclusion]The study could provide the scientific basis for realizing the wheat high and stable yield in warm-winter.