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| Effects of applying Cd/Pb contaminated maize stalks on growth and nutrient and Cd and Pb content of faba bean |
| Received:November 15, 2015 |
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| KeyWord:Pb-Zn mining area;maize stalk;faba bean;N, P and K;Cd;Pb |
| Author Name | Affiliation | E-mail | | ZHAN Fang-dong | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | CHEN Jian-jun | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | QIN Li | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | WANG Ji-xiu | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | | | LI Yuan | College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China | liyuan@ynau.edu.cn |
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| Abstract: |
| In this experiment, Cd-Pb contaminated maize stalks grown in a Pb-Zn mining area was applied to soil, and biomass of roots, stems, leaves and whole plants of, and N, P, K, Cd and Pb content of faba bean plants and soil available nutrients were examined. Application of maize stalks enhanced soil available N and K by 14%~58% and 36%~134%, respectively; but had no significant effect on soil available P. Applying maize leaves increased faba bean N, P and K by 28%, 40% and 102%, respectively, while adding maize roots only enhanced P by 42%. Applications of stems and whole plants promoted the faba bean K content by 61% and 98%, respectively. No significant effects of maize stalk applications on nutrient content in the underground part of faba bean were observed, except an increase in P content caused by maize leaves. However, maize stalk applications caused significant decreases in chlorophyll a and b in the faba bean leaves. The height and biomass of faba bean were little affected by maize stalk applications, but applying leaves and stems increased the height and aboveground biomass of the bean. Applications of maize leaves enhanced the Cd and Pb content in the aboveground part, and Cd content in the belowground part of faba bean by 56%~76% and 50%~133%, and 204%~507%, respectively. These results indicate that applying maize stalks contaminated with Cd/Pb shows beneficial roles in enhancing soil fertility and improving mineral nutrition of the following crop, while may cause environmental risks induced by Cd/Pb contamination to soils including increased plant Cd and Pb uptake by and decreased chlorophyll content in leaves of the following crops. |
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