密度对玉米新品种‘皖玉708’产量及其构成因子的影响

旨在揭示优质玉米新品种‘皖玉708’适宜密度,为品种推广和高产创建提供依据。连续2年在宿州市农科院农试场,按差数7500株/hm~2作为一个密度阶梯,45000~90000株/hm~2共6个密度处理,分析其产量及相关性状。结果表明:‘皖玉708’单位面积产量与密度成抛物线关系,其最高产量在密度为67480株/hm~2时获得,到达最高点后继续增密产量减幅较小,呈平滑下降趋势,产量与穗粒数负相关,与千粒重关系不明显;‘皖玉708’最佳种植密度为67500株/hm~2,在增加种植密度的情况下追施穗肥,是获得高产的有效途径。

New Maize Variety'Wanyu 708':Effects of Planting Density on Yield and Its Components

To reveal the suitable planting density of new maize variety'Wanyu 708', and provide a basis for the promotion and high yield of'Wanyu 708', tests were conducted at the experimental field of Suzhou Academy of Agriculture for two consecutive years. Six density treatments were set at 45000-90000 plants/hm2 with 7500 plants/hm2 as the density ladder, and the yields and correlated characters were analyzed. The results showed that a parabolic relation existed between yield per unit area and density. The highest yield was obtained at the density of 67480 plants/hm2, and then the decrease range of yield was small with density increasing, the yield showed a smoothly decreased trend. The yield was negatively correlated with grain number per corncob, but the relation between yield and thousand-grain weight was not significant. Therefore, the best planting density of'Wanyu 708'is 67500 plants/hm2, and the application of corncob fertilizer under planting density increasing is an effective way to obtain high yield.