A high level of organic matter in the soil may encourage increased mineralization of N and may also lead to increased nitrate leaching if the use of N fertilizers is not sufficiently reduced (Sincik et al., 2008). One should keep in mind this when formulating a crop fertilizer system.Chernenok (1997) indicated that nitrate content and dynamics depend on various factors like soil fertility, rainfall and precipitation distribution, temperature, aeration, soil treatment, and precious crop. This is what nitrification process is so dynamic.