粮饲兼用型玉米新品种科玉1108适宜密度研究

Study on Suitable Density for New Variety of Grain and Silage Maize Keyu 1108

以科玉1108为材料,设4个种植密度处理(4.5、5.25、6.0、6.75万株/hm^2),研究密度对粮饲兼用玉米籽粒产量和青贮生物产量的影响。结果表明:随着密度的增加,株高和穗位高增加,行粒数、千粒重、单株生物鲜重和单穗重降低,籽粒产量和青贮生物产量呈抛物线分布。收获籽粒的最佳种植密度为5.25万株/hm^2,做青贮玉米的适宜种植密度在6.0万~6.75万株/hm^2,两者兼顾的合理种植密度为5.25万~6.0万株/hm^2。

The effects of grain yield and silage biomass on the new maize variety Keyu 1108 for grain and silage were studied under the condition of different planting densities(45 000,52 500,60 000,67 500 plants/hm^2).Results showed that plant height and ear height increased with the increase of plant density.Contrarily,kernel number per row,kernels per spike,1000 kernel weight,fresh weight per plant and ear weight decreased,and the grain yield and silage biomass yield showed a parabolic distribution.It was concluded that 52,500 plants/hm^2 was appropriate for harvesting seeds,while 60,000 to 67,500 plants/hm^2 was suitable for silage cultivation.Considering the both application,the reasonable planting density was better for 52,500-60,000 plants/hm^2.