title: Effect of fertilising with pig slurry and chicken manure on GHG emissions from Mediterranean paddies.
abstract: Soil fertilisation affects greenhouse gas emissions. The objective of this study was to compare the effect of different fertilisation strategies on N2O, CH4 emissions and on ecosystem respiration (CO2 emissions), during different periods of rice cultivation (rice crop, postharvest period, and seedling) under Mediterranean climate. Emissions were quantified weekly by the photoacoustic technique at two sites. At Site 1 (2011 and 2012), background treatments were 2 doses of chicken manure (CM): 90 and 170kgNH4(+)-Nha(-1) (CM-90, CM-170), urea (U, 150kgNha(-1)) and no-N (control). Fifty kilogram N ha(-1) ammonium sulphate (AS) were topdress applied to all of them. At Site 2 (2012), background treatments were 2 doses of pig slurry (PS): 91 and 152kgNH4(+)-Nha(-1) (PS-91, PS-152) and ammonium sulphate (AS) at 120kgNH4(+)-Nha(-1) and no-N (control). Sixty kilogram NH4(+)-Nha(-1) as AS were topdress applied to AS and PS-91. During seedling, global warming potential (GWP) was ~3.5-17% of that of the whole rice crop for the CM treatments. The postharvest period was a net sink for CH4, and CO2 emissions only increased for the CM-170 treatment (up to 2MgCO2ha(-1)). The GWP of the entire rice crop reached 17Mg CO2-eqha(-1) for U, and was 14 for CM-170, and 37 for CM-90. The application of PS at agronomic doses (~170kgNha(-1)) allowed high yields (~7.4Mgha(-1)), the control of GWP (~6.5MgCO2-eqha(-1)), and a 13% reduction in greenhouse gas intensity (GHGI) to 0.89kgCO2-eqkg(-1) when compared to AS (1.02kgCO2-eqkg(-1)).
authors.affiliation: Environment and Soil Science Department, University of Lleida, Av. Alcalde Rovira Roure 191, E-25198 Lleida, Spain. Electronic address: stefania@macs.udl.cat.
authors.forename: S C
authors.initials: SC
authors.lastname: Maris
authors.affiliation: Environment and Soil Science Department, University of Lleida, Av. Alcalde Rovira Roure 191, E-25198 Lleida, Spain.
authors.forename: M R
authors.initials: MR
authors.lastname: Teira-Esmatges
authors.affiliation: Environment and Soil Science Department, University of Lleida, Av. Alcalde Rovira Roure 191, E-25198 Lleida, Spain.
authors.forename: A D
authors.initials: AD
authors.lastname: Bosch-Serra
authors.affiliation: Soils and Irrigation Department, Agrifood Research and Technology Centre of Aragon (CITA), Av. Montañana 930, E-50059 Zaragoza, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Moreno-García
authors.affiliation: Ebre Field Station, Institute of Agrifood Research and Technology (IRTA), Ctra. de Balada, km 1, E-43870 Amposta, Spain.
authors.forename: M M
authors.initials: MM
authors.lastname: Català
keywords: Ammonium sulphate; Greenhouse gas emissions; Organic fertiliser; Postharvest; Seedling period; Urea