【作者】 沈强云； 王永宏； 许志斌；

【Author】 SHEN Qiang-Yun WANG Yong-Hong XU Zhi-Bin Crop Research Institute of Ningxia Academy of Agricultural and Forestry Sciences,750105

【机构】 宁夏农林科学院农作物研究所；

【摘要】 本文针对青贮玉米品种农大647种植中存在的肥密栽培及适宜收获时期等问题,在试验条件下,进行了抽雄后天数、定植密度、施 N 量与青贮玉米生物产量间的二次回归分析, 结果表明:刈割时间、定植密度、施 N 量与青贮玉米的生物产量回归显著,建立的二次回归模式能较好地反映出单因素、两因素及三因素的变化对青贮玉米产量的影响程度。定植密度与施 N 量间存在一定的可替代性,并通过模拟分析,得出农大647的适宜定植密度在8.3 —8.5万株/hm2,施 N 量135.1—136.8kg/hm~2可获得120T/hm~2以上的产量;若施 N 量增加到 228.0—250.7kg/hm~2可获得140T/hm~2以上的产量;最佳刈割时间及定植密度变化较小,适宜刈割时期为抽雄后26—30d 为宜,结合生产情况,推荐大田青贮玉米647刈割适宜时期为8 月10日至20日为宜。更多还原

【Abstract】 Focusing on the problems of fertilizer amount,planting density and cutting date in the production of silage corn CAU647,Quadratic Regression were used in this paper and under field experiment to study the regression equation of planting density,nitrogen amount and the date after tasseling stage with silage yield.And the result showed that the regression equation is very notable and can be used to analyze the one or two or three factor’s influence on yield.To increase the planting density can replace the lack of Nitrogen Fertilizer in given range,and the simulate analysis worked out that the optimize indexes of planting density ranged from 83 to 85 thousand plants per hm² and nitrogen amount from 135.1 to 136.8 kg per hm²,and the silage yield over 120T/hm².If the nitrogen amount increased to 228.0—250.7kg/hm²,the silage yield could get over 140T/hm².The cutting date changed small and reasonable stage should be 26—30d after tasseling.Combined with production condition to increase dry matter production,the proposal cutting date should be from 10^thto 20^thin august in Ningxia.更多还原