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《Plant Nutrition and Fertilizer Science》 2010-01
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Effects of nitrogen nutrition levels on N-accumulation and yields of soybean

DONG Shou-kun,GONG Zhen-ping*,ZU Wei (College of Agronomy,Northeast Agricultural University,Harbin,Heilongjiang 150030,China)  
Labeled 15N ammonium sulfate was used as nitrogen source to study the effects of nitrogen nutrition levels on soybean(cultivar Dongnong 47) N-accumulation and yields using the sand culture.The results show that the crop N-accumulation and yields are increased earlier and decreased later as the exogenous-N levels are gradually increased,and the crop N-accumulation and yield are the highest when the nitrogen concentration is 50 mg/L.Applying N fertilizer during the R4 and R5 periods could increase the crop N-accumulation and yield significantly.Soybean growth and development needs "startup-N",and the best effect of the "startup-N" on the soybean N-accumulation is until the V3 period.Proportion of soybean absorption of exogenous-N is increased when enhancing the application level of the exogenous-N,while proportion of nodulation-N is decreased.The accumulation of the exogenous-N and accumulation of nodulation-N are increased earlier, and decreased later.The accumulation of exogenous-N is the main source when the nitrogen concentration is 100 mg/L,while the accumulation of nodulation-N is the main source when the nitrogen concentration is 50 mg/L.The accumulation of exogenous-N and accumulation of nodulation-N are increased apparently when continuously using "startup-N" until the V3 period.The exogenous-N absorption is increased apparently when high level of exogenous-N is applied during the R4 and R5 periods.
【Fund】: 国家科技支撑计划(2006BAD21B01);; 黑龙江省科技攻关课题(GA06B101);; 大豆生物学省部兴建教育部重点实验室开放基金资助项目(SB08B06);; 东北农业大学博士启动基金资助
【CateGory Index】: S565.1.062
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