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| Influence of Different Long-term Fertilization Practices on Fractionations and Bioavailability of Cu, Zn, and Cd in Soils |
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| KeyWord:long-term fertilization; heavy metal fractionation; bioavailability |
| Author Name | Affiliation | | WANG Mei | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | LI Shu-tian | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | MA Yi-bing | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | HUANG Shao-min | Institute of Plant Nutrition, Resources and Environment, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China | | WANG Bo-ren | Hengyang Red Soil Experimental Station of Chinese Academy of Agricultural Sciences, Qiyang 426182, China | | ZHU Ping | Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Gongzhuling 136100, China |
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| Abstract: |
| The purpose of this study was to investigate the effects of different long-term fertilization practices on fractionations and bioavailability of Cu, Zn, and Cd in different soils. BCR extraction procedure was used to determine the fractionations of Cu, Zn, and Cd in soil samples collected from black soil, fluvo-aquic soil and red soil under different fertilization practices i.e. CK, NK, NPK, and NPKM for more than 20-years. In black soil, application of P fertilizers increased the ratios of acid extractable and reducible fractions of Cu and Zn, while organic manures increased the ratios of acid extractable and organic-bonded Cu and Zn, but reduced the proportion of organic-bonded Cd. In fluvo-aquic soil, applying NPK or NPKM increased the proportions of acid extractable, reducible and organic-bonded Zn. In red soil, P fertilizer application increased portions of acid extractable and organic-bonded Zn, and manure addition increased fractions of reducible and organic-bonded Cu and Zn. Stepwise regression analysis between the content of heavy metals in crops and different fractions in soils indicated that the bioavailable fraction of Zn, Cu, and Cd was primarily acid extractable factions in black soil, and acid extractable, reducible and organic-bonded fractions in red soil. In fluvo-aquic soil, reducible and organic-bonded Zn and Cd were most bioavailable fractions. The total and EDTA extractable Zn, Cu and Cd profoundly influenced their fractionations in black and red soil. |
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