1. Abd‐Elfattah, A.A. and Hilal, M.H. Effect of S application on some properties of Egyptian desert soils. Proc. Arab. Reg. Conf. on Sulphur and Its Usages in the Arab Countries. Riyadh. March2–51985, Saudi Arabia. pp.39–54.
2. Araştirma Dairesi Başkanligi, Yayin no. 47, Rehber no. 8;Anonymous,1984
3. EFFECTS OF ACID SOURCE ON SOIL pH
4. Methods of Soil Analysis
5. Tech. Bull. 13;Burns G.R.,1967