江淮流域杂交油菜免耕直播栽培技术研究

杂交油菜稻田免耕直播技术适宜在江淮流域推广,能够节本增效、保证适播期并实现高产,产量可达2400kg/hm2以上。试验表明:适时早播是高产的关键,随着播期推迟,产量下降幅度逐渐增大。以9月15日￣25日为最佳播期。密度主要影响单株角果数和角粒数,极差分别达到21.3和2.2。单株生产力随密度增加而缓慢下降,因此免耕直播油菜应适度增加密度,保证足够的群体量。密度控制以27万株/hm2最为适宜。施N量对产量及相关性状有明显影响,呈抛物线趋势,不足或过高都不利于产量形成,在75￣90kg/hm2水平时产量最高。

Study on no Tillage Directed Seeding Cultivation of Hybrid Rape in Changjiang and Huaihe River Valley

It is suitable for hybrid rape no tillage direct seeding cultivation in Changjiang River and Huaihe river valley. Experiments show that it can economize cost and improve efficiency of production and keep the best sowing time and make the high yield possible. And its yield can reach more than 2400kg/hm2. Experiments also show that appropriate early sowing is the key of high yield. If the sowing time is late, the fall of yield will increase. The suitable sowing time ranges from Sep. 15 to Sep. 25. By increasing density to get an enough number of colonies, the best density is 270 thousand individual per hm2. The yield also can be influenced by different nitrogen and presents a parabola. It is not better to yield too more or too less. The study shows that the highest yield is in the range of nitrogen from 75kg/hm2 to 90 kg/hm2.