Analysis on Yield Component and Panicle Characters of Japonica Hybrid Rice in Northern China

To analyze the yield component and panicle characters of high-yield japonica hybrid rice,20 hybrid japonica rice cultivars with different yield levels were used to study high-yield and its relationship with panicle characteristics and yield component.The results showed that it was advantageous to increase yield by increasing number of panicle,seed setting rate and superiority of biomass,and to improve the panicle characters by increasing grains number at primary branch.There were significant positive correlation between panicle number and seed setting rate at secondary branch,and significant positive correlation between grains per spike and grains number at primary branch.Seed setting rate was significantly correlated with the number of secondary branch and grains number at secondary branch.Biomass was significantly correlated with seed setting rate at primary branch,seed setting rate at secondary branch and grains number at secondary branch.Some measures,including maintaining grain number per spike and superiority of biomass with increasing panicle number,seed setting rate and harvest index,could increase yield of japonica hybrid rice in Northern China.