Effects of Biogas Slurry Application on Crop Production and Soil Properties in a Rice–Wheat Rotation on Coastal Reclaimed Farmland
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The field experiment of a rice–wheat rotation system was conducted on a coastal reclaimed farmland with different application rates of biogas slurry from a large-scale standardized hoggery. Crop yield, grain quality, and soil properties were examined to determine the appropriate application rate. At the slurry application rates of 480 m3 ha−1 for rice and 9.00–11.25 m3 ha−1 for wheat, grain yields of rice and wheat were 8.9 and 15.7% higher than those under conventional fertilization, respectively. When 840 m3 ha−1 biogas slurry was applied to the rice field, the grain amino acid content was significantly higher than that of conventionally fertilized rice. In the rice–wheat rotation system, under biogas slurry treatments, soil pH and EC did not significantly increase; the contents of soil Pb, Cr, Cu, and Zn were within allowable limits; the contents of soil alkali-hydrolyzable nitrogen were greatly increased and significantly higher than those under conventional fertilization treatment; and the content of soil organic matter had no significant difference with that under no fertilization treatment. Therefore, the recommended application rate of biogas slurry on coastal reclaimed farmland should be 480 and 9.00–11.25 m3 ha−1 for rice and wheat, respectively.
KeywordsBiogas slurry Standardized hoggery Coastal zone Rice Wheat Heavy metal
This study was financially supported by the Doctorate Fellowship Foundation of Nanjing Forestry University, the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the “Six Talent Peaks” Project of Jiangsu Province (2016-NY-064), the Jiangsu Agriculture Science and Technology Innovation Fund (JASTIF) (CX(16)1003-8), and the Key Project of Science and Technology Support (Agriculture) of the Jiangsu Province (BE2013382). The authors would like to thank numerous farmers for the fieldwork, Prof. Jianming Xue for revising and improving the manuscript, and anonymous referees for their valuable suggestions that improve the manuscript.
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
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