Characteristics of Yield Components of Super-rice Cultivars in Fujian

Relationship between yield and yield components of the Super-rice cultivars in Fujian was studied. It aimed to provide reference for Super-rice breeding and high yield cultivation. Four Super-rice cultivars bred in the province and approved by China's Ministry of Agriculture, along with Shanyou 63 as the control, were used for the study. The results showed that the Super-rice yielded 10 t穐m-2, which was significantly or very significantly higher than the control. The common characteristics of the yield components included (a) the number of grains per spike was very significantly higher than the control;and (b) the yield did not significantly correlate to any individual yield component, but highly and positively correlated to the grains per spike. The path analysis indicated that the grains per spike had the greatest contribution(i.e., 70.55%)to the yield, among all factors. Rice yield was very significantly correlation to the sink size(number of panicle ? number of grains per panicle ? grain weight). The dominant factor for a high yield Super-rice was believed to be the large sink size, which depended mainly on total grains per unit area or the number of grains per panicle. Consequently, in order to improve the rice yield, large panicles should be cultivated within a certain number of panicles.