播期、密度、氮肥对直播油菜‘沪油17'产量的影响

Effects of seeding date,planting density and nitrogen fertilizer on yield of direct-seeding rape 'Huyou 17'

采用二次通用旋转组合的试验方法,研究了影响直播双低油菜产量的农艺措施,并建立了双低油菜‘沪油17'直播种植的高产栽培数学模型。结果表明:‘沪油17'直播栽培获得产量>2 250 kg/hm^2的农艺方案为:10月23-24日播种,密度41.25万~49.95万株/hm^2,纯氮202.95~227.85 kg/hm^2。农艺措施增产效应顺序为:播期>施氮量>播期与施氮量。

The agronomic measures intluencing the yield ot cllrect-seeclmg rape ot taouole low contents were investigated by using quadratic general rotary unitized design,and a mathematical model of high yield culture of double low content rape cultivar ＇Huyou 17, was established.The results showed that to gain the yield of over 2 250 kg/hm2 ,the seeding date of direct seeding ＇ Huyou 17＇ should be on Oct. 23- 24,the planting density at 412 500- 499 500 plants/hm2, andthe fertilizer rate at 202.95- 227.85 kg/hm2 （pure nitrogen）. The descending order in effects of agronomic measures on the yield growth was seeding datenitrogen fertilizer rate,both seeding date and nitrogen fertilizer rate.