不同施氮量对杂交油菜鲜干重净增量的影响

目的]为杂交油菜油研9号和油研10号高产栽培氮肥的合理施用提供依据。方法]通过对油研9号和油研10号不同施氮量间单株鲜重净增量、单株干物重净增量变化进行的研究。结果]结果表明:不同施氮量单株鲜重净增量的平均值间、单株干物重净增量的平均值间差异均达0.01极显著水平;单株鲜重净增量和单株干物重净增量均随着施氮量增加而逐渐降低;生育进程中单株鲜重净增量呈先增加后减少的变化,初花期达最大值;单株干物重净增量随着生育进程逐渐增大,成熟期达最大值;单株鲜重净增量、单株干物重净增量与单株产量净增量间均呈显著或极显著正相关。结论]该试验条件下双低杂交油菜油研9号和油研10号获得高产的适宜施氮量为225 kg/hm2。

Effects of Different Nitrogen Application Amount on the Net Increment of Fresh Dry Weight in Hybrid Rape

Objective] The aim of the research was to provide basis for reasonable application of N-fertilizer for high-yield cultivation of hybrid rape varieties Youyan 9 and Youyan 10.Method] The net increment changes of fresh weight per plant and dry matter weight per plant in Youyan 9 and Youyan 10 among treatments with different nitrogen application rate were studied.Result] The differences both among the mean values of fresh weight net increment per plant and among the mean values of dry matter weight net increment per plant among treatments with different nitrogen application amounts reached 0.01 extremely significant levels.Both fresh weight net increment per plant and dry matter weight net increment per plant were gradually decreased with the increasing of nitrogen application amount.The net increment of fresh weight per plant showed the changes of first increasing and then decreasing during the development process and reached the maximum value in initial florescence.The net increment of dry matter weight was gradually increased along with the development process and reached the maximum value in maturity stage.There were significant or extremely significantly positive correlations among fresh weight net increment per plant,dry matter weight net increment per plant and yield net increment per plant.Conclusion] Under these experimental conditions,the suitable amount of nitrogen application was 225 kg/hm2 for gaining high yield of double-low hybrid rape varieties Youyan 9 and Youyan 10.