Tillage and nitrogen fertilization in irrigated maize: key practices to reduce soil CO2 and CH4 emissions
Pareja Sánchez, Evangelina
MetadataShow full item record
In newly irrigated Mediterranean agroecosystems, the combined effect of tillage and N fertilization on soilcarbon dioxide (CO2) and methane (CH4)fluxes is at present poorly understood. The goal of this study was toquantify both soil CO2and CH4emissions as well as crop performance under different tillage systems and Nfertilization rates during three maize (Zea maysL.) growing seasons (2015-2017) in a semiarid area converted toirrigated. Three types of tillage (conventional tillage, CT, reduced tillage, RT, and no-tillage, NT) and threemineral N fertilization rates (0, 200, and 400 kg N ha−1) were compared in a randomized block design withthree replications. Weekly soil CO2and CH4emissions, soil temperature and gravimetric moisture were mea-sured. Moreover, maize above-ground biomass, grain yield, and above-ground C-inputs were quantified. Carbondioxide emissions ranged from 173 to 4378 mg CO2-C m-2d-1. No-tillage showed a greater mean soil CO2fluxthan CT when applying the highest rate of N (400 kg N ha-1). Although some emissions of CH4were observed, alltreatments acted as net CH4sinks during most of the experimental period. A linear multiple relationship betweensoil CO2fluxes and soil gravimetric moisture (0-5 cm depth) and temperature (10 cm depth) were found. In the2015 growing season, greater cumulative CO2emissions were found under NT and RT compared with CT, whilein 2016 N T showed the highest values compared to CT with intermediate values in RT. Differently, in 2017 nodifferences between tillage systems were found. When applying N fertilizer, NT and RT increased maize grainproduction and above-ground C-inputs compared to CT, since a severe soil crusting occurred in this last, whichcaused crop water deficit. The results suggest that tillage intensity and N fertilization rate reduction can increasemaize biomass production and yield which leads to greater C-input that returns to the soil.
Is part ofSoil & Tillage Research, 2019, vol. 191, p. 29-36
European research projects
The following license files are associated with this item:
Showing items related by title, author, creator and subject.
No-tillage reduces long-term yield-scaled soil nitrous oxide emissions in rainfed Mediterranean agroecosystems: a field and modelling approach Plaza Bonilla, Daniel; Álvaro-Fuentes, Jorge; Bareche Sahún, Javier; Pareja Sánchez, Evangelina; Justes, Éric; Cantero-Martínez, Carlos (Elsevier, 2018)There is a strong need to identify agricultural management practices that maintain agronomic productivity while diminishing soil N2O emissions. The yield-scaled N2O emissions (YSNE) indicator can help to evaluate the ...
Is it feasible to reduce tillage and N use while improving maize yield in irrigated Mediterranean agroecosystems? Pareja Sánchez, Evangelina; Plaza Bonilla, Daniel; Álvaro-Fuentes, Jorge; Cantero-Martínez, Carlos (Elsevier B.V., 2019-05-31)Mediterranean rainfed areas are transformed into irrigation to stabilize or increase crop yields. The gradual occupation of irrigation leads to an increase in nitrogen use and intensity of tillage. The aim of this work was ...
Impact of tillage and N fertilization rate on soil N2O emissions in irrigated maize in a Mediterranean agroecosystem Pareja Sánchez, Evangelina; Cantero-Martínez, Carlos; Álvaro-Fuentes, Jorge; Plaza Bonilla, Daniel (Elsevier, 2019-09-17)In irrigated Mediterranean conditions there is a lack of knowledge about the best combination of tillage and N fertilization practices to reduce soil nitrous oxide (N2O) emissions while maintaining maize productivity. The ...