播种期·密度及氮素水平对直播油菜产量的影响

Effects of Seeding Date,Density and Nitrogen Level on the Yield of Direct-seeding Rape

以杂交双低油菜中油杂19为试验材料,研究了播种期、密度和氮素水平对直播油菜产量的影响。结果表明,播种期、密度与氮素水平对油菜产量均达显著影响,其中播种期的影响最大。南县地区直播油菜应在10月15日前完成播种,且播种期越早越有利于高产。早播条件下增加施氮量及密度均可显著增加油菜生物量及产量,对应的适宜施氮量及密度分别为135~180 kg/hm^(2)、45.0万~52.5万株/hm^(2)(折合播种量为3.6~4.2 kg/hm^(2))。

The effects of sowing date,density and nitrogen level on the yield of direct-seeding rape were studied using double-low rapeseed of Zhongyouza 19 as the experimental material.The results showed that sowing date,density and nitrogen level all had significant effects on rape yield,and sowing date contributed the most.Direct-seeding rape in Nanxian area should be sown before October 15th,and the sooner the seeding period,the better the yield.Increasing nitrogen application rate and density under the conditions of early sowing could significantly increase rape biomass and yield,corresponding suitable nitrogen application rate and density was 135-180 kg/hm 2,45.0×10^(4)-52.5×10^(4) plants/hm^(2)(equivalent sowing rate was 3.6-4.2 kg/hm^(2)),respectively.