Study on characteristics of panicle and grain structure matched with high-yield for new hybrid rice combination "Teyou 649"

The experiment utilized the split-plot design with fertilizers as main plots and plant density as subplots,to study the characteristics of panicle and grain structure matched with a yield of more than 9t/ hm~2 for the new hybrid rice combination Teyou 649.The results showed that there was obvious difference between productive panicles derived from different nodes in terms of contribution to the yield.The contribution rate of the panicles from different nodes derived tillers was like this: the panicles from lower node tillers the panicles from secondary tillers the main panicle.The percentage of the panicles from lower node tillers was the most with 62%～73%,that of secondary tillers was 20% and the main panicle was 15%.Moreover,with fertilizer and planting density increasing,the contribution of the main panicle to the yield was increasing.