播种期对再生稻腋芽萌发和产量的影响

为探明再生稻的适宜播种期，选用培两优500和汕优63为材料，研究不同播种期对再生稻腋芽萌发和产量的影响．结果表明：不同播种期对再生稻生育期、腋芽萌发和产量均有明显影响，以3月31日播种的腋芽萌发好，再生季产量高，4月11日播种的腋芽萌发较差，但能正常成熟，4月19日播种的腋芽萌发差且不能在安全期内齐穗，导致部分穗子不能抽穗或能抽穗但不能正常成熟．从气候条件和高产角度出发，供试组合作再生稻栽培，在长沙地区的适宜播种期为3月底至4月初，最佳播种期为3月底。

Effects of Sowing Stage on the Sprouting of Axillary Bud and Yield of Ratooning Rice

In order to probe into the suitable sowing stage of ratooning rice,two hybrid rice combinations (Peiliangyou500 and Shanyou63) were used to study the effects of sowing stage on the sprouting of axillary bud and yield of ratooning rice.The result showed that there were significant effects of different sowing stage on the growth stage,the sprouting of axillary bud and yield of ratooning rice,rice sowed on March 31 was best,and the grain yield was highest that sowed on April 11 was worse,but it could mature normally,that sowed on April 19 could not reach full heading stage before safely full earing date,so some panicles could not be heading or could not mature normally.In view of the climate and high yield,the suitable sowing time of ratooning rice was in late March to early April in Changsha district,the most suitable sowing date was in late March.