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《Shandong Agricultural Sciences》 2006-04
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Effects of Nitrogen Rate and Seeding Number on Dry Matter Accumulation,Grain Yield and Nitrogen Use Efficiency of Wheat

YU Wen-ming~1,YU Zhen-wen~1,WEI Shou-jiang~2(1.Key Laboratory of Wheat Physiology and Genetics Improvement,Ministry of Agriculture,Shandong Agricultural University,Taian 271018,China;2.Yangxin Agricultural Bureau,Yangxin 256600,China)  
The effects of nitrogen rate and seeding number on dry matter accumulation,grain yield and nitrogen use efficiency of wheat cultivar Jimai 20 were studied.The results showed that,under the same seeding number,the amount of dry matter accumulation increased when the nitrogen rate increased from 0 to 240 kg/hm~2(N_2),and decreased when nitrogen rate increased to 300 kg/hm~2.At the same nitrogen rate of 180 kg/hm~2(N_1) or 300 kg/hm~2(N_3),the amount of dry matter accumulation increased when the seeding number increased from 1×10~4(M_1) to 1.5×10~4(M_2) in 666.7m~2 field.At the same nitrogen rate of 240 kg/hm~2(N_2),M_1 and M_2 treatments showed no significant difference in the amount of dry matter accumulation and the yield.Compared with the other treatments,M_1N_2 and M_2N_2 gained the highest grain yield,and the nitrogen agronomical use efficiency of M_1N_2 was higher than that of M_2N_2.With the yield,economic index and nitrogen agronomical use efficiency were considered,the treatments of M_1N_2 and M_2N_1 were recommended.And excessive nitrogen or seeding number would reduce the yield and nitrogen agronomical use efficiency.
【Fund】: 国家自然科学基金项目(30471026);; “十五”国家科技攻关项目(2002BA516A12)资助
【CateGory Index】: S512.1
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