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| Effects of combined application of straw and inorganic amendments on cadmium speciation and bioavailability in paddy soil |
| Received:April 20, 2016 |
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| KeyWord:Cd;straw-returning;inorganic amendments;rice |
| Author Name | Affiliation | E-mail | | ZHANG Qing-pei | College of Resource, Sichuan Agricultural University, Chengdu 611130, China | | | LI Bing | College of Resource, Sichuan Agricultural University, Chengdu 611130, China | benglee@163.com | | WANG Chang-quan | College of Resource, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Lan | College of Resource, Sichuan Agricultural University, Chengdu 611130, China | | | XIAO Rui | College of Resource, Sichuan Agricultural University, Chengdu 611130, China | | | ZHENG Shun-qiang | College of Resource, Sichuan Agricultural University, Chengdu 611130, China | | | GUO Yong | Jingyang Agricultural Department, Deyang City, Deyang 643000, China | |
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| Abstract: |
| To investigate effects of straw and inorganic amendments on cadmium(Cd) speciation and bioavailability in paddy soil, field experiments were conducted in Jingyang County, Deyang. The results showed that Cd content decreased significantly by combined application of straw-returning(rape straw and wheat straw) and inorganic amendments(sepiolite, lime and calcium magnesium phosphate fertilizer) in brown rice. Cd content in brown rice was decreased by 36.75% under rape straw and sepiolite, co-treatment. However, Cd content in the stem increased by 31.46%~140.73% after the combination application of rape straw with three inorganic amendments. The increasing might have a negative effect on straw returning and utilization. At the tillering stage of rice, the combination use of wheat straw and lime exhibited more efficient in decreasing exchangeable Cd in soil, which was decreased by 50.47%. At the mature stage of rice, the combination use of wheat straw with calcium magnesium phosphate fertilizer exhibited more efficiency in decreasing exchangeable Cd in soils, which was decreased by 58%. According to the regression analysis, soil Cd speciation transformed from higher availability to lower availability, thus reducing Cd accumulation in rice. Therefore, the combination application of rape straw with sepiolite, and wheat straw with lime application showed more efficiency in decrease of soil Cd availability, as well as the Cd accumulation in rice. |
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