Abstract:

In order to make clear the high yield and efficiency cultivation techniques for indica-japonica intersubspecific hybrid rice ‘Yongyou12’, 145 sets of data from 7 test sites in Taizhou and Ningbo from 2009 to 2011 were collected to study the constitutions of panicle, grain, grain weight under different yield levels and make the correlation and regression analysis when ‘Yongyou12’ is planted as single cropping late rice. The correlation analysis showed that, the whole grain number and filled grain number per panicle were significantly positive with yield, while the effective panicle and thousand-grain weight were significantly negative with yield. The multiple regression analysis established the multiple regression model between the yield and the yield traits: =-8012.58+27.29x1+36.59x2-25.53x3+165.61x4-239.75x5±766.42. Path analysis suggested that, among the main economic traits of rice, the highest direct effect panicle numbers on yield reached to 2.3526. Accordingly, controlling the number of effective panicle properly, emphasizing the large panicles and improving the seed setting rate were proposed for the high yield and efficiency cultivation techniques for ‘Yongyou12’ as single cropping late rice. Meanwhile, the cultivation techniques could also serve as a technique route for effective breeding of superior high-yield rice.