Effects of Different Planting Density and Nitrogen Plates 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.