湘东地区三熟制油菜播期及适宜密度研究

摘要

Field experiments were conducted to investigate the suitable sowing date and appropriate planting density in triple - cropping system region of eastern Hunan province. The results showed that, during October 10 to 30, sowing the earlier yield the higher, and the suitable sowing date was before October 25. Sowed on October 10, October 15, October 20, October 25 and October 30, the appropriate planting density was 375 000 ~ 450 000 plants/hm2, 450 000 plants/hm2, 450 000 -525 000 plants/hm2,525 000 -600 000 plants/hm2 and more than 600 000 plants/hm2.%为探讨湘东地区三熟制直播油菜不同播期下的适宜栽培密度,2010 ～2011年度,以偏早熟油菜品种丰油730为材料在醴陵市进行了播期与密度田间试验.结果表明:湘东地区三熟制栽培,10月10 ～30日播种,播种越早产量越高,适宜播期为10月25日前.10月10日播种,密度以37.5万～45.0万株/hm2较为适宜；10月15 ～20日播种,适宜的密度范围为45.0万～52.5万株/hm2；10月25日播种,52.5万～60万株/hm2的密度较合适；10月30日播种,密度应达到60万株/hm2.