Soils (2) eau du sol (1) région (1) Afrique du Nord (1) désertification (1) sujet (1) Afrique (1) Testing (1) Employment (1) Causes (1) Composition (1) Boundaries (1) Parts (1) Agriculture (1) Parts (1) Indexes (1) Restrooms (1) Wells (1) Waves (1) Water (1) Trace elements (1) Toilets (1) State, The (1) Soils, Irrigated (1) Soils (1) Soil temperature (1) Soil moisture (1) Signs and symbols (1) Salinity (1) Risk (1)