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Nutrient conservation during spent mushroom compost application using spent mushroom substrate derived biochar.

Authors
  • Lou, Zimo1
  • Sun, Yue1
  • Bian, Shuping1
  • Ali Baig, Shams2
  • Hu, Baolan1
  • Xu, Xinhua3
  • 1 Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China.
  • 2 Department of Environmental Sciences, Abdul Wali Khan University, Mardan 23200, Pakistan.
  • 3 Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, People's Republic of China. Electronic address: [email protected]
Type
Published Article
Journal
Chemosphere
Publication Date
February 2017
Volume
169
Pages
23–31
Identifiers
DOI: 10.1016/j.chemosphere.2016.11.044
PMID: 27855328
Source
Medline
Keywords
License
Unknown

Abstract

Spent mushroom compost (SMC), a spent mushroom substrate (SMS) derived compost, is always applied to agriculture land to enhance soil organic matter and nutrient contents. However, nitrogen, phosphate and organic matter contained in SMC can leach out and contaminate ground water during its application. In this study, biochars prepared under different pyrolytic temperatures (550 °C, 650 °C or 750 °C) from SMS were applied to soil as a nutrient conservation strategy. The resultant biochars were characterized for physical and mineralogical properties. Surface area and pore volume of biochars increased as temperature increased, while pore size decreased with increasing temperature. Calcite and quartz were evidenced by X-ray diffraction analysis in all biochars produced. Results of column leaching test suggested that mixed treatment of SMC and SMS-750-800 (prepared with the temperature for pyrolysis and activation was chosen as 750 °C and 800 °C, respectively) could reduce 43% of TN and 66% of CODCr in leachate as compared to chemical fertilizers and SMC, respectively. Furthermore, increasing dosage of SMS-750-800 from 1% to 5% would lead to 54% CODCr reduction in leachate, which confirmed its nutrient retention capability. Findings from this study suggested that combined application of SMC and SMS-based biochar was an applicable strategy for reducing TN and CODCr leaching.

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