Managing Fertigation Frequency and Level to Mitigate N2O and CO2 Emissions and NH3 Volatilization from Subsurface Drip-Fertigated Field in a Greenhouse

Agricultural practices such as water and N management can contribute to greenhouse gas (GHG) emissions. Fertigation frequency level are the two most important factors of irrigation scheduling. Proper establish moderate moist conditions throughout crop growth period in root zone reduce GHG emissions NH3 volatilization. The main objective was evaluate possibility reducing soil N2O CO2 volatilization without yield reduction by manipulating subsurface-drip fertigation (SDF) level. An experiment carried out adopting three SDF frequencies, High-Frequency (7-day, HF), Medium-Frequency (8-day, MF), Low-Frequency (10-day intervals, LF), levels, 80% (I80) 70% (I70) amount farmer’s common practice (1500 m3 ha−1). Urea, > 46.2% at rate 90% traditional fertilization (270 Kg ha−1) injected with water. Results indicated that N2O, CO2, NO3−-N, NO2−-N, water-filled pore space increased an opposite pattern for NH4+-N NH3. HF significantly (p < 0.05) 45.1% 49.2% compared LF, under I80 I70 respectively. At same level, optimum practice. Person correlation analysis showed significant correlations between NO2−-N temperature, study suggests emitters buried 0.15 m depth helps keep high Chinese cabbage increases emissions, but is not significant, decreases