Comparative Analysis of Annual High Yield and Efficiency Varieties of Rice and Wheat in Jiangsu Southern Rice Region

[Objective] The aim was to understand growth period,yield and main traits as well as the relation with farming system of varieties combination of rice and wheat in Jiangsu Southern rice region. [Method] Sixteen Japonica rice varieties and nine wheat varieties planting in Suzhou area were selected,and growth period,yield and main traits were analyzed through comparison tests in different areas of Suzhou City.[Result]The yield showed very difference in tested Japonica rice varieties,while there was no difference in tested wheat varieties. The different sowing date and growth period of Japonica rice varieties had no significant correlation with yield,while the different sowing date and growth period of wheat varieties had very significant correlation with yield. The number of grains per spike of high yield and efficiency varieties of rice and wheat had very significant correlation with yield,which indicated that keeping the number of spike per hectare,controlling ineffective tillering,improving spike rate and increasing the number of grains per spike were the important basis for annual high yield and efficiency varieties of rice and wheat. [Conclusion]As for Suzhou area,when annual high yield and efficiency varieties of rice and wheat were selected,yield and quality of rice varieties were mainly observed,secondly sowing date and growth period of wheat varieties were considered,and then high yield varieties,efficiency varieties or the combination of high yield and efficiency varieties of rice and wheat were matched.