1. United Nations Organization (UNO). World Population Expected to Reach 9.6 Billion in 2050; 2013. p. 7. Available from: http://www.adequations.org/spip.php?article985
2. Food and Agriculture Organization (FAO). Fertilizer Use by Crop in Algeria. 1st Ed. Rome, Italy: FAO; 2005. p. 56
3. National Institute of Soil for Irrigation and Draining (INSID). Summary Note on the Actions Carried out by the National Institute of Soils, Irrigation and Drainage in the Context of Fertilization. 2009. p. 16. Available from: http://insid.dz/realisation/sol/R6.pdf
4. Haffaf H, Benkherbache N, Benniou R, Saoudi M. Study of nitrogen fertilization applied to the production of seeds of Triticum durum wheat (waha variety) in the semi-arid zone (M'sila). Agriculture Journal. 2016;S1:272-277
5. Saoudi M, Benkherbache N, Benniou R, Haffaf H. Study of nitrogen fertilization applied to the production of Hordeum vulgare L barley seeds. (Tichedrett variety) in the semi-arid zone of M'sila. Agriculture Journal. 2016;S1:265-271