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| Effects of Pig Slurry from Large-scale Pig Farm on Medium, Micro-and Heavy Elements Contents of Rice |
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| KeyWord:pig slurry; rice; secondary and micro element; heavy metals |
| Author Name | Affiliation | | GAO Wei | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University | | WANG Yuan-ling | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University | | TAO Xiao-ting | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University | | SHI Jin-qi | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University | | XU Xing | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University | | LU Jian-fei | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University | | ZHUANG Heng-yang | Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Agriculture, Yangzhou University |
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| Abstract: |
| With the rapid development of China′s large-scale pig farms, increasing pig slurry is causing serious environmental pollution that in turn threatens the sustainable development of large-scale pig farming. The utilization of pig slurry, a kind source of nutrients, combined by pig farming with cropping is one of the best solutions to this problem. As the utilization of pig slurry in farmlands lacked systematic research, a field experiment was conducted to study the effect of pig slurry on the contents of medium, micro elements and heavy metals elements in rice. The results of the study could provide the scientific basis for efficient rice production that supported large-scale pig farming. The pig slurry used in the experiment contained 1000 mg·L-1 of total nitrogen, 540 mg·L-1 of available nitrogen and 779 mg·L-1.The water quality of pig slurry contains Cu, Zn, Pb, Cd, Cr, As, Hg,and the content was 0.246 mg·L-1, 0.577 mg·L-1, 0.041 mg·L-1, <5.0×10-4 mg·L-1, 0.063 mg·L-1, 0.0283 mg·L-1, <5×10-4 mg·L-1 respectively. It conforms to standary for irrigation water quality.The late-maturing middle Japonica rice Huaidao No.5 and pig slurry were adopted in a field experiment to investigate the combined pig slurry and N fertilizers（187.5 kg·hm-2） on six medium, micro elements contents and five heavy elements. The results showed that the contents of Pb, As, Ca, Mg and Fe in rice reached the highest at every growth stage, when combined with the treatment of base fertilizer 90 m3·hm-2 pig sulurry and pannicle fertilizer 120 m3·hm-2 pig sulurry plus 187.5 kg·hm-2 urea . The levels of Cd, Hg, Cr and Mn reached the highest at every growth stage when using conventional fertilization（CK2）. Cu reached the highest value at every growth stage except jointing stage when using pig slurry treatments（M）. Zn reached the highest value at every growth stage except jointing stage, when combined with base fertilizer 90 m3·hm-2 pig slurry, 120 m3·hm-2 and 187.5 kg·hm-2 N fertilizer.As, Pb, Mg, Zn, Fe, Mn and Cu increased with the increasement of pig slurry in heading stage on the basis of identical pig slurry as base fertilizer.Meanwhile, Hg, Cd and Cr reduced with the increasement of pig slurry.The contents of Pb, Cd, Cr, As and Hg in grains of every treatments were lower than the Maximum levels of contaminants in foods（GB 2762—2005）. Meanwhile the pig slurry as basal, panicle fertilizer and compound fertilizer could not only enhance the contents of Zn, Fe, Mn, Ca, Na and Mg, but also reduce the contents of Hg, Cd, Cr. It is concluded that the substitute ferlitizer of pig slurry could partially improve the beneficial elements contents. Moreover, it could not lead to the elevation of heavy metals, whereas, it could reduce the levels of some heavy metals, such as Hg, Cd and Cr. |
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