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《Journal of Hunan Agricultural University(Natural Sciences)》 2008-06
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Effect of N at different levels on super hybrid rice yield and growth in tropical ecological zones

WU Zhao-hui1,2,QING Xian-guo2,YUAN Long-ping2(1.College of Biology Science and Technology,Central South University,Changsha 410083,China;2.China National Hybrid Rice Research and Development Center,Changsha 410125,China)  
Under ecologically tropical conditions of breeding base Sanya in Hainan province,a combination of super hybrid rice Liangyoupeijiu and combination of symptoms Liangyou0293,GD-1S/RB207 were used as materials.Five different levels of nitrogen as 0(N1,CK)、150(N2)、300(N3)、450(N4)、600(N5) kg/hm2 were set up to study effect of different nitrogen fertilizer management on yield and growth.The results are as follows:Liangyoupeijiu in N3 had the highest yield,from the point of ecology and cultivation,in Sanya,Hainan,for super hybrid rice appropriate nitrogen application was 300 kg/hm2.With the increase of each additional 150 kg/hm2(purity nitrogen),early heading stage and heading stage were correspondingly delayed by 3~6 d,As a result,the whole growth period extended by 3~6 d.With the increase of nitrogen application,wound flow increased.Above the level of N4,with increase of application,wound flow declined rather than increased.With the increase of application within the range of 0~450 kg/hm2,volume ratio of surface roots declined,but that of middle roots went up.Within the range of 450~600 kg/hm2,with the increase of application,volume ratio of surface roots went up rather than go down,whlie volume ratio of middle roots went down rather than go up.With increase of nitrogen application,flag leaf of variety Liangyou peijiu and Liangyou 0293 tended to grow in both length and width,with its leaf agnle showing a up-down-up trend.
【Fund】: 国家“863”项目(2003AA212011)
【CateGory Index】: S511
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