关键词: 长沙烟区, 烟稻复种, 晚稻, 施氮量, 密度, 产量形成

Abstract:

In order to explore the optimal nitrogen application rate and planting density of late rice after tobacco in tobacco-rice rotation system in Changsha tobacco area, the interaction effects of fertilizer and density on late rice after tobacco were studied with Fengyuanyou 299 as material in Liuyang, Changsha in 2013-2014. The results showed that the whole growth duration of late rice after tobacco was prolonged 2 days by nitrogen application, while which had no relation to density. LAI of rice increased with the increment of nitrogen application rate and planting density, while there existed interaction effect between nitrogen application rate and planting density which showed difference between two years. SPAD value of leaves of late rice after tobacco significantly increased by nitrogen application, while which was not related to density. In yield components of rice, 1000-grain weight was relatively stable, which showed indistinctive change with the change of nitrogen application rate and planting density. The interaction effects of nitrogen application rate and planting density on yield components of late rice after tobacco was significant. Under the lower density (152 000~200 000 hill/hm ²), effective panicles, grain number per panicle and yield increased with the increment of nitrogen application rate and planting density. Under higher density (210 000~300 000 hill/hm ²), seed setting rate increased with the increment of nitrogen application rate, while effective panicles, grain number per panicle and yield increased first and decreased afterwards, and interaction effect of 300 000 hill/hm ²+N 90kg/hm ² was the best.

Key words: Changsha tobacco area, Tobacco-rice rotation, Late rice, Nitrogen application rate, Density, Yield formation