免耕·翻耕稻田油菜适宜播种量的研究

目的]探讨甘蓝型杂交油菜稻田免耕和翻耕条件下直播适宜的播种量。方法]进行不同栽培方式、品种和播种量的裂区设计试验,并计算植株性状与播种量间的相关性。结果]翻耕直播比免耕直播的产量高,平均增产5.38%,达显著水平。但翻耕直播栽培与免耕直播栽培播种量相当,虽然产量略有增加,但增加的产值不足以弥补翻耕的劳动成本。不同品种播种量间的产量差异不显著。结合已有的研究统计,得出直播油菜的播种量为3.8~4.5 kg/hm2。随着播种量的增加油菜的有效分枝部位增高,株高略有降低,主花序长变短,单株有效分枝数和单株有效角果数减少,千粒重降低。结论]该研究为进一步完善和充实直播油菜栽培技术提供依据。

Study on the Suitable Sowing Amount of Rape under No-tillage and Ploughing Cultivation

Objective] To explore the suitable sowing amount of direct seeding under no-tillage and plowing cultivation in the field of hybrid rape.Method] The split plot design experiment was carried out in different cultivation methods,varieties and sowing amount,and the correlation between plant characters and seeding quantity was calculated . Result ] Yield of ploughing direct seeding was higher than no-tillage direct see-ding,the average yield was 5.38%,which increased significantly.But ploughing direct seeding cultivation had equal seeding amount to no-tillage direct cultivation.Although the former showed a slight increase in production ,the increase in output value was not enough to make up for the labor cost of plowing.The yield difference was not significant between different cultivars.Combining with the existing researches,the seeding quantity of direct seeding rape was 3.8-4.5 kg/hm2 .With the increase of seeding quantity,effective branch height of rape enhanced,plant height slightly de-creased,the length of the main inflorescence became short ,the effective pod number per plant and effective branch number per plant decreased and 1000-grain weight reduced.Conclusion] This research provides references for the further improvement of direct seeding technology of rape.