02483naa a2200313 a 450000100080000000500110000800800410001910000160006024501160007626000090019252016170020165000090181865000090182765300230183665300200185965300190187965300300189865300160192865300210194470000160196570000140198170000190199570000180201470000150203270000170204770000140206470000220207877300690210019995932015-03-06       2014    bl uuuu     u00u1 u    #d1 aPIVA, J. T.  aSoil gaseous N2O and CH4 emissions and carbon pool due to integrated crop-livestock in a subtropical Ferralsol.  c2014  aWe assessed the impact of integrated crop-livestock (CL), with silage maize (Zea mays L.) in summerand grazed annual-ryegrass (Lolium multiflorum Lam.) in winter, and continuous crop (CC), with annual-ryegrass used only as cover-crop, on net greenhouse gas emission from soil (NetGHG-S) in a subtropicalFerralsol of a 3.5-year-old experiment in Brazil. Emissions from animal excreta in CL were estimated.Soil N2O fluxes after N application to maize were higher in CL (max. 181 g N2O-N m−2h−1) than in CC(max. 132 g N2O-N m−2h−1). The cumulative annual N2O emission from soil in CL surpassed that in CCby more than three-times (4.26 vs. 1.26 kg N2O-N ha−1, p &lt 0.01), possibly because of supplementary Napplication to grazed ryegrass in CL (N was not applied in cover-crop ryegrass of CC) and a certain degreeof soil compaction visually observed in the first few centimetres after grazing. The estimated annual N2Oemission from excreta in CL was 2.35 kg N2O-N ha−1. Cumulative annual CH4emission was not affectedsignificantly (1.65 in CL vs. 1.08 kg CH4-C ha−1in CC, p = 0.27). Soil organic carbon (OC) stocks were notaffected by soil use systems, neither in 0?20-cm (67.88 in CL vs. 67.20 Mg ha−1in CC, p = 0.62) or 0?100-cm (234.74 in CL vs. 234.61 Mg ha−1in CC, p = 0.97). The NetGHG-S was 0.652 Mg CO2-Ceqha−1year−1higher in CL than in CC. Crop-livestock emitted more N2O than CC and no soil OC sequestration occurredto offset that emission. Management of fertiliser- and excreta-N must be focused as a strategy to mitigate NO2 fluxes in CL.  aGado  aSolo  aAquecimento global  aDairy livestock  aFertilização  aGlobal warming mitigation  aMitigação  aSubtropical soil1 aDIECKOW, J.1 aBAYER, C.1 aZANATTA, J. A.1 aMORAES, A. de1 aTOMAZI, M.1 aPAULETTI, V.1 aBARTH, G.1 aPICCOLO, M. de C.  tAgriculture, Ecosystems and Environmentgv. 190, p. 87-93, 2014.