Studies On Different Cultivation And Yieldperformance Of Double Cropping Rice In Cold Waterlogged Paddy Fields

The comparison experiments with different varieties and cultivation methods were conducted in Changsha,Ningxiang,Yiyang,Taoyuan,Hengyang and Yongxing in 2009 and 2010, especially Ningxiang,Taoyuan and Yongxing are low yield paddy fields.The results showed that:1.(1)The yield performance among cultivars was similar in Ningxiang,Taoyuan and Yongxing in 2009. LLY996 and LLY211 in early season rice showed higher yield, of which averaged as 5.68 t/hm2 and 5.28 t/hm2 in three locations; QY-1,TYHZ and FYY299 in late season rice showed higher yield, of which averaged as 5.08 t/hm2,4.94 t/hm2 and 4.81 t/hm2 in three locations.The yield performance among cultivars was also similar in Ningxiang,Yiyang,Taoyuan and Hengyang in 2010.The yield of the treatment with fertilization was hihger. LLY996 and ZLY819 in early season rice showed higher yield, of which averaged as 5.03 t/hm2 and 4.58 t/hm2; FYY299 and TYHZ in late season rice showed higher yield, of which averaged as 6.08 t/hm2 and 5.98 t/hm2 in four locations.(2)The results of 2 years indicate that, LLY996,FYY299 and TYHZ performance better in low yield paddy fields.2.(1) The yield performance among different cultivation methods was different in three locations. In Taoyuan site, the treatments of tillage and no-tillage showed higher yield in both early season and late seasons. In Yongxing site, the highest yield was founded by using no-tillage treatment in early season but by using ridge in bed treatment in late season. In Ningxiang site, tillage cultivation treatment showed the highest yield in both early season and late one.The yield performance among four cultivation methods was the same in Changsha and Taoyuan in 2010,tillage was the best but no remarkably difference. LLY819 and FYY299 was better in early and late rice.(2)The comparison among 4 cultivation patterns between 2 location is extremely significant differences in yield performance, leaf area index, dry matter accumulation and soil temperature in taoyuan also obviously lower than Changsha.(3)According to the existent problems in cold waterlogged paddy fields, there are several ways to increase production:first select the suitable varieties;second use sufficient base manure and top application; third Adjustment period of broadcast inserted;four ridge tillage or tillage cultivation.