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Mekelle University The School of Graduate Studies Faculty of ...

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and N-total during composting and vermicomposting. Agrociencia-Montecillo,35 (4), 377-384.SAS Institute (2002). SAS user’s guide: Statistics. Statistical Analysis System Institute,Cary, NC.Satchell, J.E. (1983). Earthworm Ecology from Darwin to Vermiculture. Chapman andHall. London.Satchell, J.E. (1967). Lumbricidae. In: Burges, A. and F. Raw (eds.). Soil Biology.Academic Press. New York, NY. pp. 259- 322.Sharpley AN, Syres JK (1977). Seasonal variations in casting activity and in the amountsand release to solution <strong>of</strong> phosphorous forms in earthworm casts. Soil Biol.Biochem. 9: 227-231.Shipitalo, M.J. & Protz, R. (1989). Chemistry and micromorphology <strong>of</strong> aggregation inearthworm casts. Geoderma, 45, 357-374.Shipitalo, M.J. (1987). Soil structure formation and stabilization by earthworms andtillage effects on soil porosity. PhD <strong>University</strong> <strong>of</strong> Guelph Canada.Shipitalo, M.J. and R. Protz. (1989). Chemistry and micromorphology <strong>of</strong> aggregation inearthworm casts. Geoderma 45:357-374.Sims, J.T. (1990). Nitrogen mineralization and elemental availability in soils amendedwith cocomposted sewage sludge. Journal <strong>of</strong> Environmental Quality, 19 (4), 669-675.70

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