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| Safety dosage of pig manure based on soil copper accumulation on rice and wheat rotated farmland |
| Received:June 21, 2016 |
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| KeyWord:manure;heavy metal;accumulation rate;replacement ratio |
| Author Name | Affiliation | E-mail | | SUN Guo-feng | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | CHEN Yu-wen | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | SHENG Jing | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHANG Li-ping | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHOU Wei | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | CHEN Liu-gen | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | ZHENG Jian-chu | Institute of Agricultural Resources and Environments, Jiangsu Academy of Agricultural Sciences/Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | zjc@jaas.ac.cn |
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| Abstract: |
| A field experiment was conducted with different dosage of pig manure on rice and wheat rotated farmland. Five mixed soil samples were taken in the 0~10 cm and 10~20 cm soil layers in the rice harvest period in 2013 and 2014, respectively. The contents of total and available copper were determined by atomic absorption spectrometry after HF-HNO3-HClO4 heating digestion method and DTPA extraction method respectively to analyze the characteristic changes and accumulation rate of total and available copper under different dosage of pig manure. The analysis of pig manure safety use ages was according to the secondary standard of agricultural safety production combined with total copper annual accumulation rate of different dosages of pig manure in the 0~10 cm soil layer. The field experiments results clearly demonstrated that the contents and accumulation rate of total and effective copper showed a linearly increasing trend with the increased pig manure application ratio in the arable soil layer on rice harvest. By average annual accumulation rate of total copper, safety use ages of pig manure showed a decreasing trend of power equation with the increased pig manure application ratio in the 0~10 cm soil layer. Replacement ratios of pig manure nitrogen to chemical nitrogen were 50.3%~62.7% in 20 years scale, and 19.1%~26.1% in 50 years scale according to the secondary standard of agricultural safety production. In all, based on soil copper accumulation rate, it is suggested that replacement ratios of pig manure nitrogen are less than 50% in 20 years scale, and within 20% in 50 years scale in the rice and wheat field experiment. |
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