| Vermicomposting, the non-thermophilic decomposition of organic wastes by earthworms, is a popular waste management option in the Americas, Europe and the Indian subcontinent. Although the technology is inexpensive and produces an organic fertilizer as well as earthworm biomass, there are few examples of vermicomposting in sub-Saharan Africa. The objective of this thesis was to investigate the potential for vermicomposting in Accra, the capital city of Ghana, by conducting (1) an earthworm survey, (2) vermicomposting trials and (3) assessing farmers' perceptions of vermicompost as an organic fertilizer and other related issues. The earthworm Eudrilus eugeniae (Kinberg), was found in the soil-litter layer at seven locations across Accra. In a 20 d period, the E. eugeniae decomposed 99% of pineapple fibers and 87% of pineapple peels supplied, indicating that this earthworm is capable of vermicomposting. The nutrient value of the vermicompost was low, relative to other organic wastes in West Africa, probably due to the low nutrient content of pineapple wastes. Farmers were aware of the benefits to soil fertility from earthworm activity and associated the presence of earthworm castings with healthy soils. However, those involved in irrigated vegetable farming had insufficient space and time for on-farm vermicomposting and would prefer to purchase this fertilizer. Conversely, subsistence farmers lacked a reliable access to water necessary for on-farm vermicomposting. In summary, farmers were interested in the technology and were willing to adopt it, provided the vermicompost improved crop performance and was affordable and available. |
