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Effects of Cd pollution on the pepper growth and control responses of different fertilizations

SUN Man-yi1,3,GUO Xi-sheng3,WANG Wen-jun2(1.School of Life Sciences,Anhui University,Hefei 230039; 2.Anhui Provincial Lab of Nutrient Cycling,Resources and Environment,Hefei 230031;3.Soil and Fertilizer Institute,Anhui Academy of Agricultural Sciences,Hefei 230031)  
In order to study the effects of Cd pollution on pepper growth and control responses of different fertilizations,pot experiment was carried out.The results showed that after Cd pollution,the biomass of root,stems and leaves decreased significantly,and the reduction trends of fruit yields were also influenced by other factors.The Cd pollution increased remarkably the Cd content of pepper plants with the range of fruitsrootsstems.In high Cd soils,chicken manure not only increased the biomass of root and stems as well as fruit yields significantly,but decreased the Cd contents by 20%~50%.In Cd polluted soils,inorganic additives increased biomass of above-ground part,root and the fruit yields,decreased the plant Cd contents by 23%~33%.The Cd content of pepper root,stem and fruit were positively correlated with soil exchangeable,carbonate bound and Fe-Mn oxide bound Cd,insignificantly with organic bound and residual Cd.Cd pollution obviously increased soil exchangeable,carbonate bound and residual Cd.Application of chicken manure decreased the content of soil exchangeable Cd and increased organic bound and residual Cd content in high Cd soils while inorganic additives decreased the Fe-Mn oxide bound,organic bound and residual Cd content and increased soil exchangeable and carbonate bound Cd content in Cd polluted soils.
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