Study on the Effect of Different Densities and Nitrogen Application Amounts on the Yield and Agronomic Characters of Zhengdan 958

[Objective] The aim was to study the effect of different nitrogen application amount and density on the agronomic characters and yield of Zhengdan 958.[Method] With Zhengdan 958 as tested variety and urea as tested nitrogen fertilizer,the effect of agronomic characters and yield of Zhengdan 958 in the area under the level of different nitrogen application amount and density were studied.[Result] Under the same density,1 000-grain weight was increased,grains per spike was decreased and other characters had no obvious difference with the increment of nitrogen application amount.Under the same nitrogen application level,ear diameter,ear rows and kernels per row were obvious increased with the increment of sowing density,but that was decreased when reached to certain density.Under certain density,the yield of Zhengdan 958 was increased correspondingly with the increment of nitrogen application amount.Under the same nitrogen fertilizer treatment,the yield of Zhengdan 958 with different density treatment was increased with the increment of density,but that was decreased when reached to certain density.The optimum planting density of Zhengdan 958 in the area was 82 500 plants per hm2 and the suitable fertilizer application amount was 225.0 kg/hm2.[Conclusion] The research laid the foundation for the rational planting of Zhengdan 958 in Jianghuai area.