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Vertisol --- Vertisols --- Climatologie --- Climatology --- Irrigation --- Eau du sol --- Soil water --- Sol argileux --- Clay soils --- Labour --- Ploughing --- Système de culture --- cropping systems --- Agriculture traditionnelle --- Traditional farming --- Drainage --- drainage --- ILCA --- Afrique au sud du Sahara --- Africa South of Sahara --- Ethiopia --- 631.445.723 --- 631.11 <66/67> --- -Soil management --- -Soils --- Soil science --- Agronomy --- Shrink-swell soils --- Swell-shrink soils --- Soils --- Grumusol. Black friable soils. Vertisols --- Farms, farm properties and farming systems--States and territories south of the Sahara. Sub-Saharan Africa --- Congresses --- Management --- Conferences - Meetings --- -Grumusol. Black friable soils. Vertisols --- 631.445.723 Grumusol. Black friable soils. Vertisols --- -631.445.723 Grumusol. Black friable soils. Vertisols --- Soil management --- drainage. --- 1988