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Evaluation of wood ash as additive for green waste composting

By: Blaise P. Bougnom, Alain M. Sontsa-Donhoung, Dieudonne Onguene, Pauline Mounjouenpou, François X. Etoa

Key Words: Compost, Wood ash, Green waste, Tropical agriculture.

Int. J. Agron. Agri. Res. 13(5), 35-45, November 2018.

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A study was conducted to produce composts with a high liming potential using both green waste and wood ash for use in agriculture. increased proportions of wood ash were co-composted with green waste. During composting, all the produced composts presented the classical composting temperature curve and reached a thermophilic composting phase (P ≥50 °C) which lasted for 8 days. The produced composts had a C/N ratio between 10 and 15, and their pH was above neutrality, meaning maturity. They were rich in nutrients (Mg, K and Na) and poor in heavy metals (Pb, Zn, and Cu). Wood ash addition did not impair neither the bacterial nor the fungal communities; however, addition of high amounts of wood ash could reduce the metabolism of the microbial communities including cellulase activity that showed a proportional decrease according to the added amount. The composts showed a germination index greater than 100% at all concentrations. It could be concluded that co-composting green waste with wood as hallowed to obtain a good organic fertiliser with higher liming potential, nutrient content, and less hazardous material which could beused to remediate soil acidity of tropical soils.

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Evaluation of wood ash as additive for green waste composting

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Blaise P. Bougnom, Alain M. Sontsa-Donhoung, Dieudonne Onguene, Pauline Mounjouenpou, François X. Etoa.
Evaluation of wood ash as additive for green waste composting.
Int. J. Agron. Agri. Res. 13(5), 35-45, November 2018.
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