Data/hora: 12/06/2024 04:31:44

Biblioteca(s): | Embrapa Pesca e Aquicultura.
Data corrente: | 14/02/2019
Data da última atualização: | 14/02/2019
Autoria: | KOHMANN, M. M.; SOLLENBERGER, L. E.; DUBEUX JUNIOR, J. C. B.; SILVEIRA, M. L.; MORENO, L. S. B.; SILVA, L. S. da; ARYAL, P.
Afiliação: | MARTA M. KOHMANN, UNIVERSITY OF FLORIDA, Gainesville-FL; LYNN E. SOLLENBERGER, UNIVERSITY OF FLORIDA, Gainesville-FL; JOSE C. B. DUBEUX JUNIOR, UNIVERSITY OF FLORIDA, Marianna-FL; MARIA L. SILVEIRA, UNIVERSITY OF FLORIDA, Ona-FL; LEONARDO SIMOES DE BARROS MORENO, CNPASA; LILIANE S. DA SILVA, UNIVERSITY OF FLORIDA, Gainesville-FL; PARMESHWOR ARYAL, UNIVERSITY OF FLORIDA, Gainesville-FL.
Título: | Nitrogen fertilization and proportion of legume affect litter decomposition and nutrient return in grass pastures.
Ano de publicação: | 2018
Fonte/Imprenta: | Crop Science, v. 58, n. 5, p. 2138-2148, Sept./Oct. 2018.
ISSN: | 0011-183X
DOI: | 10.2135/cropsci2018.01.0028
Idioma: | Inglês
Conteúdo: | Warm-climate grasslands are often N limited. Legume litter decomposition can contribute significantly to N input in grazing systems, but its contribution depends on litter deposition, decomposition, and chemical composition. We evaluated these responses for 2 yr in unfertilized (BG) and fertilized (BGN; 50 kg N ha&#8722;1) bahiagrass (Paspalum notatum Flügge) monocultures and in mixed swards of bahiagrass plus the legume rhizoma peanut (Arachis glabrata Benth.). Legume?grass mixture litter had greater initial N concentration (26 g N kg&#8722;1 organic matter [OM]) and lower C/N ratio (22) than BG and BGN, which did not differ from each other (18 g N kg&#8722;1 OM, C/N ratio of 31). Litter biomass relative decay rate was greater for mixtures than for bahiagrass monocultures. As a result, less biomass and N remained at the end of incubation in mixtures (62 and 76%, respectively) than in monocultures (69 and 80%, respectively). Litter deposition rate was similar across treatments, but faster decomposition and greater N concentration for legume?grass mixtures resulted in larger litter N release than in monocultures (44 and 26 kg ha&#8722;1, respectively). At the end of incubation, remaining litter biomass and remaining N decreased with increasing litter legume proportion, whereas litter N concentration and litter decay rate increased. Results indicate that legume?grass mixtures are an alternative to N fertilizer for increasing N cycling through plant litter in grasslands, and although litter deposition rates were similar across treatments, increasing legume proportion in mixtures is likely to be associated with greater litter N release.
Thesagro: | Biomassa; Decomposição; Fertilizante Nitrogenado; Nitrogênio; Pastagem.
Thesaurus Nal: | Grasslands; Nitrogen fertilizers; Nutrient requirements; Pastures; Plant litter.
Categoria do assunto: | P Recursos Naturais, Ciências Ambientais e da Terra
Registro original: | Embrapa Pesca e Aquicultura (CNPASA)
Exemplares: | CNPASA - (779-1) - UPC - AP - DD - CNPASA_AP96 -  - 2018.096 - DIS