种植密度和施氮水平对东青1号青贮玉米生物产量及农艺性状的影响

试验以专用青贮玉米新品种东青1号为试验材料．研究了4种密度和6个施氮水平对青贮玉米生物产量及主要农艺性状的影响。结果表明,密度和施氮水平对生物产量的影响不是简单的线性递增关系,达到一定量后生物产量不在增加,相反有所降低。在种植密度为4．67万株／hm2和施氮水平18．4g/m2时该品种的生物产量最高;主要农艺性状随密度和施氮量的变化情况不同．株高、空秆率、穗位高随着密度的增加有增加的趋势;单株绿叶数、穗粗、穗行数、行粒数、穗长、茎粗随着密度的增加有下降的趋势;株高、茎粗、单株绿叶数、穗粗、穗位高、穗长随着施氮量的增加而增加．为防止倒伏应适当施用氮肥。随着施氮水平的提高．个体的长势较好．空秆率会相应减少。

Effects of Different Planting Density and Nitrogen Rates on Biological Yield and Agricultural Traits of Silage Maize Dongqing 1

Abstracts: In this paper the effects of 4 planting densities and 6 nitrogen rates on biological yield and a-gricultural traits of silage maize were studied by using Dongqingl as materials. The results showed that the effects of density and nitrogen rate on biological yield were not simple linear relation, and as they reached some level the biological yield was stable, contrarily, the biological yield would decrease. When the planting density was 46700 plant/hm2 and the Nitrogen rate was 18.4g/hm2, Dongqingl reached the highest biological yield; the main agricultural traits were different with the varieties of density and Nitrogen rate. With the increasing of density, plant height, bare plant rate and ear height increased; however with the increasing of planting density, green leave number per plant, ear diameter, row number, kernels per row, ear length and stem diameter decreased. With the increasing of nitrogen rate, the plant height, stem diameter, green leave number per plant, ear diameter, ear height and ear length increased, so nitrogen must be applied properly in order to avoid lodging. However under increased nitrogen rate the growing of plant was well and the bare plant rate decreased.