种植密度与施氮量对玉米杂交种川单418产量的影响

目的]探讨种植密度和施氮量对川单418玉米杂交种产量的影响,为其快速推广提供理论依据。方法]以密度为主处理（45000～67500株/hm2）,施氮量为副处理（90～360kg/hm2）,研究不同密度和施氮量对川单418产量的影响。结果]种植密度和施氮量对川单418产量的影响均达极显著水平（P〈0.01）,川中丘陵区川单418的最佳种植密度为60000株/hm2,比常规种植密度可以适当加大,最佳施氮量为270kg/hm2,产量可达到8024.36kg/hm2。密肥互作效应分析表明,在较高密度下,氮肥对产量的调控作用更为明显,主要通过影响穗粒数来实现。结论]在西南地区加强玉米杂交种川单418种植密度和肥力组合调控可有效提高产量。

Effects of Growing Density and Applying Nitrogenous Fertilizer Quantity on the Yield of the Maize Hybrid Chuandan No.418

Objective]To explore effects of different growing density and applying nitrogenous fertilizer quantity on the yield of the maize hybrid Chuandan No.418,and provide the theoretical basis for the promotion of the new maize hybrid Chuandan No.418.Method]Effects of different growing density and applying nitrogenous fertilizer quantity on the yield of the maize hybrid Chuandan No.418 under density-based processing (45 000-67 500 plants/m2) and the vice processing of nitrogen fertilizer application (90-360 kg of pure N/m2) were studied.Result]Effects of growing density and applying nitrogenous fertilizer quantity on the yield of the maize hybrid Chuandan No.418 were highly significant (P<0.01).The best density was 60 000 plants/hm2,appropriate than conventional planting density could be increased,and the optimal nitrogen for 270 kg of pure N/hm2,the yield reached at 8 024.36 kg/hm2 of the maize hybrid Chuandan No.418 in hilly area of the central Sichuan basin.The interaction effects analysis of growing density and applying nitrogenous fertilizer quantity showed that the regulation of nitrogen fertilizer on the yield was more obvious under the higher density,it achieved mainly through the impact of grain number.Conclusion]In the southwest areas of China,increasing the growing density and applying nitrogenous fertilizer quantity combined control can significantly increase production.