Effect of Different of N Fertilization on Agronomic Traits and Yield of Late Rice in Middle Area of Guangxi

In order to investigate the effect of nitrogenous fertilization in double cropping rice of Middle Area of Guangxi,to growth character of rice,yield and agronomic efficiency of nitrogen,we carried out field experiment for effect of different of nitrogen on rice in Xingbin county of Guangxi in 2008—2009.Results show that the nitrogen has simulative effect for early rice growth,obviously improve yield structure of rice,raise rice production,compared with no nitrogen(N0),plant height and effective panicles of two years lately rice of nitrogen treatment increased respectively 10.33% and 37.18%,total grain number of single panicles and setting rate increased respectively 17.06%and 7.17%,average of rice yield increase 37.00%.But when nitrogen325.5 kg/hm2,rice nitrogen efficiency is reduced substantially,raised agricultural cost,polluted seriously environmental with continue to increase of fertilizer.Visible,late rice nitrogen was applied nitrogen 163.5～325.5 kg/hm2 that is a more reasonable fertilization pattern in Middle Area of Guangxi,because it can both stabilize high-yielding of rice,ensure security of local food and assure high utilization of the fertilizer resources.