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The nitrogen uptake,yield and its components for two super-high-yielding hybrid rice combinations,Guodao 6 and Eryou 7954 were investigated under different plant densities(15,18,and 21 plants/m2) and different nitrogen application rates(120,150,180,and 210 kg/hm 2 ) .The experiment was conducted on loam soil during 2004-2006 at the experimental farm of the China National Rice Research Institute in Hangzhou,China.In these years,the two hybrid rice clearly showed higher yield at a plant density of 15 plants/m2with a nitrogen application rate of 180 kg/hm 2.Guodao 6 produced an average grain yield of 10 215.6 kg/hm 2 across the three years,while the yield of Eryou 7954 was 9 633.0 kg/hm 2 .With fewer plants per unit-area and larger plants in the plots,the two hybrid rice produced more panicles per plant in three years.The highest nitrogen uptake of the two hybrid rice was at a plant density of 15 plants/m2with a nitrogen application rate of 180 kg/hm 2. Further increasing nitrogen application rate was not advantageous for nitrogen uptake in super-high-yielding rice under the same plant density.
The nitrogen uptake, yield and its components for two super-high-yielding hybrid rice combinations, Guodao 6 and Eryou 7954 were investigated under different plant densities (15, 18 and 21 plants / m2) and different nitrogen application rates (120, 150, 180, and 210 kg / hm 2). The experiment was conducted on loam soil during 2004-2006 at the experimental farm of the China National Rice Research Institute in Hangzhou, China. These years, the two hybrid rice clearly showed higher yield at a plant density of 15 plants / m 2 with a nitrogen application rate of 180 kg / hm 2.Guodao 6 produced an average grain yield of 10 215.6 kg / hm 2 across the three years, while the yield of Eryou 7954 was 9 633.0 kg / hm 2 .With fewer plants per unit-area and larger plants in the plots, the two hybrid rice produced more panicles per plant in three years. the highest nitrogen uptake of the two hybrid rice was at a plant density of 15 plants / m2with a nitrogen application rate of 180 kg / hm 2. Further increasing nitrogen applica tion rate was not advantageous for nitrogen uptake in super-high-yielding rice under the same plant density.