Uar - High dam soil survey - Vol 4, special subjects and investigations.

abonos besoin en eau calcio calcium chemicophysical properties ciencia del suelo desert soils engrais fertilizers gypse gypsum infiltration irrigation irrigation de surface irrigation par aspersion methode methods necesidades de agua palaeontology paleontologia paleontologie palinologia palynologie palynology riego riego de superficie roca roche rock saline sodic soils sandy soils sciences du sol soil mechanics soil sciences sol sableux sol salin sodique sprinkler irrigation suelo arenoso suelo de desiertos surface irrigation valles valleys variedades varieties vertisol vertisoles vertisols water requirements yeso