Biological and chemical reactivity and phosphorus forms of buffalo manure compost, vermicompost and their mixture with biochar

Biological reactivity of these substrates was related to their soluble organic matter content, which decreased in the order buffalo manure > compost > vermicompost. Phosphorus was labile in all organic substrates and composting transformed organic P into plant available P. The presence of biochar led to a protection of organic matter against chemical oxidation and changed their susceptibility to biological degradation, suggesting that biochar could increase the carbon sequestration potential of compost, vermicompost and manure, when applied in mixture.