Data/hora: 24/06/2024 01:10:00

Biblioteca(s): | Embrapa Suínos e Aves.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | A - 2
Data corrente: | 03/12/2020
Data da última atualização: | 04/12/2020
Autoria: | LEAL, O. A.; AMADO, T. J. C.; FIORIN, J. E.; KELLER, C.; REIMCHE, G. B.; RICE, C. W.; NICOLOSO, R. da S.; BORTOLOTTO, R. P.; SCHWALBERT, R.
Afiliação: | OTÁVIO A. LEAL, UFSM; TELMO JORGE CARNEIRO AMADO, UFSC; JACKSON ERNANI FIORIN, Cooperativa Central Gaúcha Ltda; CRISTIANO KELLER, UFSM; GEOVANE REIMCHE, UFSM; CHARLES W. RICE, Kansas State University; RODRIGO DA SILVEIRA NICOLOSO, CNPSA; RAFAEL PIVOTTO BORTOLOTTO, Unicruz; RAÍ SCHWALBERT, UFSM.
Título: | Linking 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.
Ano de publicação: | 2020
Fonte/Imprenta: | Agronomy, v. 10, n. 1848, 2020.
DOI: | 10.3390/agronomy10121848.
Idioma: | Inglês
Conteúdo: | Abstract: 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
Palavras-Chave: | Emissão de carbono.
Thesagro: | Aveia; Cobertura do Solo; Cultivo Intensivo; Ervilhaca; Milho; Planta de Cobertura; Plantio Direto; Soja.
Categoria do assunto: | --
Registro original: | Embrapa Suínos e Aves (CNPSA)
Exemplares: | CNPSA - (22016-1) - UPC - AP - DD -  -  -  - DIS