【摘要】 [目的]为研究一定生态条件下玉米高产的适宜种植密度。[方法]采用大田试验,以豫单998和郑单958玉米品种为对象,研究了不同种植密度对2个品种穗部性状及产量的影响。[结果]在试验密度范围内,郑单958的产量随密度的增加而增加;豫单998的产量开始随密度的增加而提高,当密度为67500株/hm2时,产量达最大(9375.47kg/hm2),当种植密度为75000株/hm2时,产量反而下降。2个供试品种随着种植密度的增加,穗长、行粒数、穗粒重、千粒重均呈逐渐下降趋势;秃尖随密度的增加而增加;穗行数和穗粗无明显差异。[结论]不同玉米品种的耐密性有所差异,郑单958的适宜高产密度为75000株/hm2,豫单998的适宜高产种植密度为67500株/hm2。更多还原

【Abstract】 [Objective] The study aimed to provide the optimal planting density for hybrid yield under certain ecological conditions.[Method] The effects on spike characters and yield of maize were studied under 60 000,67 500 and 75 000 plants/hm2 by field test.[Result] The yield of the hybrid of Zhengdan 958,in a certain range,could increase by increasing plant density.For the hybrid of Yudan 998,the grain yield increased first and then decreased when density increased continuously.And increased plant density led to decrease in ear length,grains per row,grain weight,and 1 000-grain weight,and go up in bald tip degree.There was no significant difference between two hybrids in rows per ear and ear diameter.Based on the analysis of orthogonal experiment,the best cultivation way was made.[Conclusion] Density had the different effect on different variety maize,the feasible planting density of Zhengdan 958 was 75 000 plants/hm2,that of Yudan 998 was 67 500 plants/hm2.更多还原