Effects of Transplanting Density and Nitrogen Rate on Dry Matter Production and Yield of Tianyouhuazhan

To explore the effects of transplanting densities(37.0×104,22.2×104 hill/hm2) and nitrogen application rates(0,120,165 and 210 kg/hm2) on dry matter production,yield and its components of super late rice,field experiments were conducted with Tianyouhuazhan as material in Changsha and Chenzhou in 2008.The results showed that dry matter accumulation and grain yield of super rice was increased by nitrogen application under two transplanting densities,while no significant difference existed among nitrogen application treatments.Harvest index was decreased by nitrogen application.Effects of nitrogen application on yield components existed clear regional difference.The yield increase after nitrogen application resulted from the increase of effective panicle,spikelet number per panicle and 1000-grain weight in Changsha,while it mainly by increase of effective panicle in Chenzhou.