Nitrous oxide and methane emissions from a surface drip‐irrigated system combined with fertilizer management

摘要: Drip-fertigated systems have variable distributions of water and nutrients in the soil, which influence soil microbial activity. Because there is a lack data on greenhouse gas (GHG) fluxes for these systems, field experiment comparing drip irrigation (fertigated non-fertigated) was carried out melon crop. For fertigated treatment, nitrogen (N) as NH4NO3 dissolved split into six applications (Fertigation treatment). In non-fertigated (ANS treatment), granular incorporated homogeneously upper part surface at planting. A control treatment without N fertilizer also included. order to evaluate pattern nitrous oxide (N2O) methane (CH4), measurements were made different distances from distributor point (dripper). An additional with N-15-labelled parallel, aim evaluating contribution nitrification denitrification total N2O flux. Two sources N-15 applied: (NH4NO3)-N-15 (20 at% excess N-15) ((NH4+)-N-15 TR1) excess(15)N) ((NO3-)-N-15 TR2). Results indicated that both treatments Fertigation) had small emission (< 0.1% applied). However, Fertigation produced larger emissions (175.3 g N2O-N ha(-1)) than ANS (90.1 ha(-1)), being strongly influenced by systems. Denitrification contributed (N2O)-N-15 but mainly day after application treatment. Methane affected fertilizer, decrease sink effect CH4 when NH4+ present soil.