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| Effects of pig farm slurry application on heavy metals in the cabbage and soil |
| Received:September 06, 2021 |
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| KeyWord:pig farm slurry;cabbage;soil;heavy metal form |
| Author Name | Affiliation | E-mail | | CHENG Juan | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | LIU Muheng | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | | | XIAO Nengwu | Shiyan Academy of Agricultural Science, Shiyan 442000, China | | | YANG Liu | Shiyan Academy of Agricultural Science, Shiyan 442000, China | | | DU Huiying | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | duhuiying@caas.cn | | DU Lianzhu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | dulianzhu99@163.com | | ZHANG Keqiang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China | |
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| Abstract: |
| It is important to study the accumulation of heavy metals in the process of farmland application of pig farm slurry because of potential impacts such as effectiveness enhancement and morphological changes. This study conducted field experiments to explore the effects of pig farm slurry application on the contents, available states, and forms of heavy metals in facility cabbage and soil. The results showed that there was no significant difference between the application of slurry treatment and optimized fertilization(NOPT), with low Cu, Zn, Cr, Pb, As, and Cd contents in the shoots of the cabbage. The Cu, Zn, Cr, Pb, As, and Cd contents did not exceed the safety limit value of the Limits of Contaminants in Foods(GB 2762-2017). After four crops of facility cabbage were planted, compared with those of NOPT, 561 kg·hm-2 of slurry application treatment significantly increased the soil Cu, Zn, and Cr contents, the Zn(except for in the 0~20 cm soil layer), Pb, Cr, Cd, and As contents in the 281 kg·hm-2 of slurry application treatment and NOPT were not significantly different, and the Cu, Zn Cr, Pb, As and Cd contents were lower than the safety limit value of the Soil Environmental Quality Risk Control Standard for Soil Contamination of Agricultural Land(GB 15618-2018). The application of chemical fertilizers and manure water significantly increased the soil effective Cu and Zn contents. The manure water treatment had little effect on the morphology of the Cr, Pb, As, and Cd in the soil, whereas it significantly increased the content of Fe-Mn-bound Zn. Correlation analysis showed that soil available Cu, Zn, Cr, Cd, and Pb had a significant positive correlation with soil organic matter, olsen P, total nitrogen, and NO3-N, and a significant negative correlation with pH. Four consecutive applications of manure water will not pose a the risk of the soil heavy metals content exceeding the standard. Studies have shown that four consecutive applications of manure water did not pose the content of heavy metals in the facility cabbage and soil to exceed the standard, significantly enhance the effectiveness of Cu and Zn, and significantly increase the content of Fe-Mn-bound Zn. |
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