KHEDIJA, B.; FAYSAL, B. J. EFFECTS OF SULLA CROP (Hedysarum coronarium L.) CONDUCTED IN DIRECT AND CONVENTIONAL DRILLINGS, ON THE PHYSICO-CHEMICAL PROPERTIES OF CLAY SOIL UNDER TUNISIAN SEMI-ARID CLIMATE. Algerian Journal of Arid Environment “AJAE”, v. 5, n. 1, 4 nov. 2018.