赣南中低产田区双季稻耐早衰高产品种筛选

[目的]筛选出适合赣南中低产田区种植的耐早衰高产早、晚稻品种。[方法]在双季稻产量常年低于12 000 kg/hm2的中低产田区,于2011、2012年选择市场主推早、晚稻品种各8~10个,早稻以欣荣优2045、晚稻以天优998为对照,重复3次,研究各品种产量表现、生育后期光合速率、叶片SPAD值下降率和根系干重下降率及子粒灌浆充实度情况,筛选出高产稳产、后期耐早衰品种。[结果]早稻品种五优157、荣优1506与晚稻品种五优308、欣荣优2660的2年产量表现较高且稳定,较对照分别增产3.0%、2.8%和6.3%、3.2%,其生育后期光合速率下降率、上三叶SPAD值下降率、根系干重下降率都明显低于对照,子粒灌浆充实度明显高于对照。[结论]早稻品种五优157、荣优1506与晚稻品种五优308、欣荣优2660可在赣南中低产田区推广种植,从中任选1个早稻品种和1个晚稻品种进行双季稻品种搭配种植,可实现15 000 kg/hm2的产量目标。

Screening of Aging Resistance and High-yield Varieties of Double-cropping Rice in Middle-yielding and Low-yielding Fields of Southern Jiangxi Province

[Objective] In order to select appropriate aging resistance and high-yield varieties of double-cropping rice in middle-yielding and low-yielding fields of southern Jiangxi Province.[Method] Under the condition of double cropping rice yield less than 12 000 kg/hm2 in middleyielding and low-yielding fields,selecting 8-10 varieties of early,late rice in 2011 and 2012,with early rice Xinrongyou 2045 and late rice Tianyou 998 as control by repeating 3 times test,high and stable yield,aging resistance varieties were screened out by studying the result of different varieties' yield,photosynthetic rate,leaf SPAD and root dry weight decreasing rate and grain filling degree in the late growth stage.[Result]The results showed that early rice Wuyou 157,Rongyou 1506 and late rice Wuyou 308,Xinrongyou 2660 were in high and stable yield.Comparing with contract variety,yield of above four varieties increased 3.0％,2.8％ and 6.3％,3.2％,their dropping rate of photosynthetic rate in late growth stage,upper three leaf SPAD and root dry weight were also significantly lower and the grouting fulfillment was significantly higher than control.[Conclusion] Early rice Wuyou 157,Rongyou 1506 and late rice Wuyou 308,Xinrongyou 2660 can he planted in middle-yielding and low-yielding fields of southern Jiangxi Province.The yield can be expected to 15 000 kg/hm2 from the option of variety in early and late rice for double-cropping rice varieties collocation planting.