02538naa a2200337 a 450000100080000000500110000800800410001902400350006010000160009524501680011126000090027952015700028865000100185865000220186865000220189065000140191265000100192665000240193665000190196065000090197965300240198870000200201270000180203270000150205070000190206570000160208470000230210070000220212370000190214577300360216421275652020-12-04       2020    bl uuuu     u00u1 u    #d7 a10.3390/agronomy10121848.2DOI1 aLEAL, O. A.  aLinking cover crop residue quality and tillage system to CO2-C emission, soil C and N stocks and crop yield based on a long-term experiment.h[electronic resource]  c2020  aAbstract: Cover crops (CC), particularly legumes, are key to promote soil carbon (C) sequestration in no-tillage. Nevertheless, the mechanisms regulating this process need further elucidation within a broad comprehensive framework. Therefore, we investigated effects of CC quality: black oat (Avena strigosa Schreb) (oat), common vetch (Vicia sativa L.) (vetch), and oat + vetch on carbon dioxide-C (CO2-C) emission (124 days) under conventional- (CT), minimum- (MT) and no-tillage (NT) plots from a long-term experiment in Southern Brazil. Half-life time (t1/2) of CC residues and the apparent C balance (ACB) were obtained for CT and NT. We linked our data to long-term (22 years) soil C and nitrogen (N) stocks and crop yield data of our experimental field. Compared to CT, NT increased t1/2 of oat, oat + vetch and vetch by 3.9-, 3.1- and 3-fold, respectively; reduced CO2-C emissions in oat, oat + vetch and vetch by 500, 600 and 642 kg ha-1, respectively; and increased the ACB (influx) in oat + vetch (195%) and vetch (207%). For vetch, CO2-C emission in MT was 77% greater than NT. Legume CC should be preferentially combined with NT to reduce CO2-C emissions and avoid a flush of N into the soil. The legume based-NT system showed the greatest soil C and N sequestration rates, which were significantly and positively related to soybean (Glycine max (L.) Merrill) and maize (Zea mays L.) yield. Soil C (0?90 cm depth) and N (0?100 cm depth) sequestration increments of 1 kg ha-1 corresponded to soybean yield increments of 1.2 and 7.4 kg ha-1, respectively  aAveia  aCobertura do Solo  aCultivo Intensivo  aErvilhaca  aMilho  aPlanta de Cobertura  aPlantio Direto  aSoja  aEmissão de carbono1 aAMADO, T. J. C.1 aFIORIN, J. E.1 aKELLER, C.1 aREIMCHE, G. B.1 aRICE, C. W.1 aNICOLOSO, R. da S.1 aBORTOLOTTO, R. P.1 aSCHWALBERT, R.  tAgronomygv. 10, n. 1848, 2020.