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《Journal of Northeast Agricultural University》 2008-08
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Effects of NH_4~+-N and NO_3~-—N levels on growth of soybean in seedling stage

DONG Shoukun,MA Chunmei,ZU Wei,JIN Xijun,GONG Zhenping(College of Agriculture,Northeast Agricultural University,Harbin 150030,China)  
This work was conducted using DN47 which was cultivated by sand culture to study the effects of NH4+-N and NO3-—N levels on the growth of soybean at seedling stage.The results were shown as follows: total biomass and the shoot biomass changed with the increase of the nitrogen level and showed a sigle peak curve,the effect of NH4+-N was more than that of NO3-—N.Total biomass and the shoot biomass reached the peak when the concentration of NH4+-N was 125 mg·L-1,reached another peak when the concentration of NO3-—N was 275 mg·L-1,lowered when it was 500 mg·L-1,total biomass and the shoot biomass of NH4+-N were bigger than that of NO3-—N when the nitrogen concentration was above 20 mg·L-1.The biomass of root was lower when the nitrogen con-centration of two nitrogen forms were 500 mg·L-1 than that of other concentration,and there was no significant difference between other nitrogen levels.The root/shoot ratio decreased with the increase of nitrogen level,and hardly changed when it was 125 mg·L-1.When the nitrogen concentration was 20 mg·L-1,the root/shoot ratio of two nitrogen forms was similar,but NO3-—N was bigger than that of NH4+-N when the nitrogen concentration was above 20 mg·L-1.
【Fund】: 国家科技支撑计划(2006BAD21B01);; 黑龙江省科技攻关课题(GA06B101-3);; 黑龙江省教育厅骨干教师项目
【CateGory Index】: S565.1
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