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| Effects of paddy field disposal of biogas slurry on rice production，soil fertility and environmental safety |
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| DOI：10.16768/j.issn.1004-874X.2016.10.013 |
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| Abstract: |
| Abstract：The effects of paddy field disposal of biogas slurry on rice production，heavy metal content in rice
grain and straw，soil fertility and environment quality were investigated in field experiment with treatments of control
（no fertilizer input） and different dosage of biogas slurry（ 200，400，600，800，1 000 m3/hm2）. Results showed
that yield of rice grain and straw increased with biogas slurry application，the concentration of nitrogen（N），
phosphorus（P） and potassium（K） in rice straw and the concentration of N in rice grain enhanced，therefore，
the accumulation of N，P and K were improved. With biogas slurry dosage increased，the concentration of arsenic
（As） in rice straw enhanced compared to control，while the concentration of As in rice grain and lead（ Pb） in rice
grain and straw were not improved，however，the concentration of cadmium（ Cd） in rice grain and straw decreased.
The mercury（ Hg） and chrome（ Cr） were not detected in rice grain and straw in this experiment. Furthermore，
the soil organic matter was enhanced with biogas slurry application，soil pH was improved compared to control. In
addition，the contents of Cd，Cr，As，Pb and Hg in soil were lower than the corresponding limitations in the National Soil Environment Quality Standards（ GB 15618-1995），there was no risk of heavy metal contamination. However，
there were significant and markedly significant positive correlations between soil As，Cr concentration and dosage of
biogas slurry，respectively. Thus，it should not be neglected that long-term amended with biogas slurry would lead to
environment pollution due to As and Cr accumulation. |
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