Optimal and toxic levels of heavy metals in soil and plants of food crops produced on Brazilian Oxisol
Knowledge of optimal and toxic heavy metals levels in soils and plants is important for rational use of these elements in improving crop yields and avoiding contamination of the environment. Three greenhouse experiments were conducted to determine optimal and toxic levels of Zn, Cu and Mn in soil and plant tissue of upland rice, dry bean, wheat, corn, and soybean grown on a Brazilian Oxisol. The heavy metals rates used were: Zn- 0, 5, 10, 20, 40, 80 and 120mg·kg <-1> soil, Cu-0, 2, 4, 8, 16, 32, 64 and 96mg·kg<-1> soil, and Mn- 0, 10, 20, 40, 80, 160, 320 and 640mg·kg<-1> of soil. Optimum soil levels of Zn for five crop species varied from 0.5 to 5.0mg·kg<-1>. Toxic levels of this element varied from 25 to 94mg·kg<-1>. Optimal Zn levels in plant tissue varied from 18 to 67mg·kg<-1>. Toxic Zn levels varied from 133 to 673mg·kg<-1>. Optimal Cu values in soil varied from 1.0 to 10mg·kg<-1>. Toxic levels of Cu in soil varied from 10 to 52mg·kg<-1>. In plant tissue, optimal Cu levels varied from 6 to 15mg·kg<-1> and toxic levels varied from 10 to 26mg·kg<- 1>. The optimal Mn level in soil was 8.0mg·kg<-1> for five crop species and the toxic level in soil ranged from 44 to 400mg·kg<-1>. Optimal and toxic levels of Mn in soil and plant tissue ranged from 60 to 520 and 720 to 4560mg·kg<-1>, respectively.
Zinc copper manganese Oryza sativa Phaseolus vulgaris Triticum aestivum Zea mays
N. K. Fageria
Embrapa Rice and Bean Research Center, Caixa Postal 179, Santo Antonio de Goias, GO, CEP 75375-000, Brazil
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
696-697
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）