摘要： 为明确安徽省沿江地区再生稻种植产量差形成的原因，筛选出该地区适宜的再生稻种植品种，以9个杂交水稻品种为试材，比较分析了其头季和再生季生育期、再生力、产量及其构成因素等性状。结果表明，在产量构成因素中，造成不同品种头季稻产量差异的主要因素是单位面积上的有效穗数；导致再生季产量差异的主要因素是单位面积上有效穗数和每穗着粒数。准两优608再生季单产5.27 t/hm²，2季综合产量高达13.59 t/hm²，可作为该地区再生稻种植的优选品种；皖稻119和新两优6号头季产量高，再生力较强，再生季产量潜力大，可以作为该地区再生稻种植的候选品种。研究表明，生产中可通过增加单位面积上有效穗数，主攻大穗，并在维持较高结实率的基础上提高千粒质量以实现再生季产量增加和获得2季综合高产。

关键词: 杂交水稻, 再生稻, 产量构成, 产量差

Abstract: Rice ratooning is the production of a second rice crop from the stubble left behind after the first seasonal rice harvest.To clarify the reason caused the yield differences in rationing rice cultivation and select ratoon rice varieties adapted to the region along the Yangtze River in Anhui Province,the field experiment was carried out to compare the growth period,rationing ability,yield and its components of the main and ratoon rice using 9 hybrid rice varieties as test materials.The results showed that the effective panicles was responsible for the yield differences in main crops,and the effective panicles as well spikelets per panicle caused the yield differences of ratoon crops.Zhunliangyou 608 was the prior ratoon rice variety with the ratoon yield of 5.27 t/ha and total grain yield (main crop plus ratoon) of 13.59 t/ha in this region.Wandao 119 and Xinliangyou 6 were recommended as candidate varieties for higher grain yield in the main rice,stronger rationing ability as well larger grain yield potential in the ratoon rice.It indicated that the key approaches to enhancing ratoon grain yield and total grain yield were to increase the effective panicle number per unit area,spikelets per panicle and 1000-grain weight on the basis of maintaining the high seed setting rate.

Key words: Hybird rice, Ratoon rice, Grain yield and its components, Yield difference

中图分类号: 

• S511.01