Chemical and biological evaluation of maturity of pig manure compost at different C/N ratios

Guofeng Huang*, Qitang Wu, Fange A.I. Li, Jonathan W C WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Aerobic static pile composting (mechanical turning every 3 days) of pig manure was prepared at 8 m3 windrow heaps. Sawdust was used as the bulking agent to provide additional carbon and to increase the porosity of the substrate. Two treatments at initial C/N ratios of 30 and 15, respectively, were designed in the study. Dissolved organic carbon (DOC), soluble NH-4-N, C/N ratios in solid and aqueous phases, E-4/Ec ratios, and seed germination index (GI) were determined to evaluate the maturity of the co-composts. Seed germination index, a biological parameter, was suggested as one of the most reliable maturity indicators for organic compost. The results showed that the treatment at the initial C/N ratio of 30 reached maturity after 49 days of composting; however, the treatment at the initial C/N ratio of 15 should require composting time of longer than 63 days to obtain maturation. Chemical multi-indicator evaluation was necessary, and the GI measurement was the recommended approach for maturity evaluation in the study.

Original languageEnglish
Pages (from-to)243-250
Number of pages8
JournalPedosphere
Volume11
Issue number3
Publication statusPublished - 2001

Scopus Subject Areas

  • Soil Science

User-Defined Keywords

  • C/N ratio
  • Composting
  • Maturity
  • Pig manure

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