These are straight or NPK nitrogen containing fertil- izers treated with specific chemical molecules that stabilize the Nitrogen (N). This is in order to decrease the leach and gasification losses resulting in a consid- erable improvement in fertilization efficency.
The ammoniacal nitrogen (N) is treated with the ni- trification inhibitor DCD (dicyandiamide). The DCD inhibits the Nitrosonomas bacteria responsible for ni- trification for several weeks, allowing the NH4+ ion to remain in the soil for a long period of time. This en- hances the acidifying properties around the root sys- tem of the plants.
The ureic nitrogen is treated with the chemical inhib- itor NBPT (N-butyl thiophosphoric triamide), which reacts with the urease enzyme in order to slow down the hydrolysis reaction. This phenomenon greatly re- duces the volatilization process of Urea, decreasing the ammonia emission in the atmosphere by 50%, in comparison to an untreated fertilizer.