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《Journal of Safety and Environment》 2008-02
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Effect of cadmium stress on growth of soybeans and the contents of nutrition elements in soybean grains

HUANG Yun-xiang1,LIAO Bo-han2,WANG Zhi-kun3(1 College of Resources and Environment,Hunan Agricultural University,Changsha 410128,China;2 College of International Studies,Central South University of Forestry and Technology,Changsha 410004,China;3 College of Sciences,Zhejiang Forestry University,Hangzhou 311300,China)  
The aim of the present paper is to study the effect of different concentrations of Cd on the contents of N,P,K,Zn,Cd in soybean grains that are now cultivated in two kinds of typical Hunan soil,i.e.the red soil and the alluvial soil so as to improve the profitability of reasonable use of the local soil resources slightly polluted by cadmium.The results of our experiments can be shown as follows:(1)Cd stress at lower concentrations(0.25 mg/kg)helps to increase the height and biomass of soybean plants whereas depressed effects can be found at high Cd concentrations with the two kinds of tested soil.(2)Cd treatment at different concentrations may lead to the decrease of N content in the soybean grains,which has been found enhanced with the increase of the Cd concentrations.Furthermore,Cd and Phosphorus presence in the grains reveals a synergistic effect at lower Cd concentrations(0.25-0.50 mg/kg),and an antagonistic effect at the Cd increased concentrations.At the same time,the presence of Cd and potassium in the soybean grains indicates an antagonistic effect at low Cd concentrations.While an antagonistic effect is exhibited in the plant leaves,Cd and zinc presence in grains reveals a synergistic effect.(3)The correlation analysis between Cd concentrations in grains and soils prove that the Cd critical value in the red and alluvial soils is 0.157 mg/kg and 0.769 mg/kg respectively when the Cd content in the grains is below 0.2 mg/kg.
【Fund】: 国家自然科学基金项目(20677080);; 湖南农业大学科学基金项目(07WD25)
【CateGory Index】: X503.231
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