Effects of Nitrification Inhibitors on Soil Nitrification and Ammonia Volatilization in Three Soils with Different pH

The application of nitrification inhibitors (NIs) is considered to be an efficient way delay nitrification, but the effect NIs combinations on soil and ammonia (NH3) volatilization are not clear in soils with different pH values. In this study, we explored nitrapyrin (CP) its 3, 4-dimethylepyrazole phosphate (DMPP), dicyandiamide (DCD) transformation nitrogen, potential rate (PNR), a 120-day incubation experiment three values black soil. Treatments included no fertilizer (Control), ammonium sulfate (AS), AS+CP (CP), AS+CP+DMPP (CP+DMPP), AS+CP+DCD (CP+DCD). significantly decreased NO3?-N contents (p < 0.05), while increased NH4+-N especially CP+DCD CP+DMPP were most effective neutral alkaline soils, respectively. acid soil, CP total NH3 by 31%, reduced 28% compared AS. However, significant difference was found without treatments > 0.05) soils. conclusion, combined had better efficiency all tested inhibiting clay higher value lower organic matter, mitigating environment pollution reducing N loss loam matter. It provided theoretical basis for high Further studies under field conditions required assess effects these inhibitors.