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50 Febr alfisols annual rainfall appr average surface runoff bananas bulk density cassava catchment clay cm thick coffee crumby cultivated denudation/year eroded erosion plots field capacity Figures in brackets forest sites forest soils gentle-slope plots Heijnen high runoff percentages Highland Evergreen Forest Highland forest humic infiltration capacity infiltrometer inorg Intermediate Evergreen Forest l00 April l975 respectively late to monthly layer Lundgren Lushoto District maize measurements mm/h monthly throughfall mulch O'O O'O O'O organic matter content plant available water plots Ro population density porosity present study rain-days rainfall and throughfall rainfall/rain-day rainy seasons Rapp runoff and soil runoff water Saboni samples soil erosion steep steep-slope plots Stockholm surface runoff T'O T'O Table l4 Tanzania Tengeru texture three sites throughfall in l974 ton/ha/y topsoil total organic carbon total soil loss tropical University of Stockholm Usambara Mts water-stable aggregates weeding West Usambara