conservation de l'eau (1) sol (1) ruissellement (1) mulch (1) perte (1) infiltration (1) agriculture (1) génie agricole (1) conservation (1) argile (1) Zimbabwe (1) Conservation (1) Agriculture (1) Fallow lands (1) Rates (1) Sustainable agriculture (1) Water conservation (1) Water (1) Tillage (1) Soils--Classification (1) Soils (1) Seepage (1) Runoff (1) Rain and rainfall (1) Fallowing (1) Corn (1) Clay (1) Agriculture (1) Agricultural engineering (1) Stories, plots, etc (1)