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[目的]探讨成都平原免耕直播油菜的适宜密度和施氮量。[方法]以川油58为供试材料,采用裂区试验,分析氮密互作对成都平原免耕直播油菜生长及产量的影响。[结果]在成都平原区,免耕直播油菜产量随密度、施氮量的增加均呈先增加后降低的趋势,密度、施氮量主效应均显著影响油菜生长及产量,施氮量影响效应大于密度,氮密互作对油菜产量产生负效应,但影响程度不显著。在密度30.00×104株/hm2、施氮量180.00kg/hm2互作条件下,油菜群体产量最高为3395.25kg/hm2,当密度为40.80×104株/hm2、施氮量为198.90kg/hm2时,氮密互作条件下油菜群体可获得最高理论产量3403.41kg/hm2。[结论]在成都平原区,免耕直播油菜的密度以30.00×104~45.00×104株/hm2、施氮量以180.00~198.90kg/hm2为宜。
[Objective] The aim was to discuss the appropriate density and nitrogen application rate of no-tillage direct seeding rape in Chengdu plain. [Method] With ChuanYu 58 as tested material, split zone experiment was conducted to analyze the effect of nitrogen and nitrogen interaction on growth and yield of direct seeding rape in Chengdu Plain. [Result] The yield of no-tillage direct seeding rape increased first and then decreased with the increase of planting density and nitrogen application rate in plain area of Chengdu. The main effect of density and nitrogen application rate had significant effects on the growth and yield of rapeseed, the effect of nitrogen application Greater than the density, nitrogen and nitrogen interactions have a negative effect on rapeseed production, but the impact is not significant. Under the conditions of density 30.00 × 104 plants / hm2 and nitrogen application rate 180.00kg / hm2, the highest yield of rapeseed population was 3395.25kg / hm2. When the density was 40.80 × 104 plants / hm2 and the nitrogen application rate was 198.90kg / hm2 The highest theoretical yield of 3403.41kg / hm2 can be obtained under the conditions of nitrogen and nitrogen interaction. [Conclusion] The density of no-tillage direct seeding rape in the plain area of Chengdu was 30.00 × 104 ~ 45.00 × 104 plants / hm2 and the nitrogen application rate was 180.00 ~ 198.90kg / hm2.