Data/hora: 16/06/2024 03:50:10

Biblioteca(s): | Embrapa Agrossilvipastoril.
Data corrente: | 26/10/2011
Data da última atualização: | 26/10/2011
Autoria: | MATOS, E. da S.; CARDOSO, I. M.; SOUTO, R. L.; LIMA. P. C. de; MENDONÇA, E. de S.
Afiliação: | EDUARDO DA SILVA MATOS, CPAMT; IRENE MARIA CARDOSO, UFV; RENATA LÚCIA SOUTO, UFV; PAULO CÉSAR DE LIMA, EPAMIG; EDUARDO DE SÁ MENDONÇA, UFES.
Título: | Characteristics, residue decomposition, and carbon mineralization of leguminous and spontaneous plants in coffee systems.
Ano de publicação: | 2011
Fonte/Imprenta: | Communications in Soil Science and Plant Analysis, New York, v. 42, p. 482-502, 2011.
Idioma: | Inglês
Conteúdo: | Abstract: We investigated the chemical and biochemical composition, residue decomposition, and mineralization rate of leguminous (Cajanus cajan, Crotalaria spectabilis, and Lablab purpureus) and spontaneous vegetation in two experimental coffee systems in south- east Brazil. The nitrogen (N) content of the shoot biomass varied from 19.3 to 45.7 g kg?1 , and phosphorus (P) content ranged from 1.6 to 3.8 g kg?1 . C. cajan contained the greatest values of N and P, whereas spontaneous plants had the lowest values. In both areas, spontaneous vegetation had the greatest values of carbon (C) / P, C/N, polyphenol/N, and (lignin + polyphenol) / N ratios. Decomposition rate increased in the order C. cajan < C. spectabilis < L. purpureus < spontaneous vegetation. There was no correlation between the chemical and biochemical composition and the decom- position rate under field conditions. However, the cumulative carbon dioxide (C-CO2 ) produced by the residues under laboratory conditions was correlated positively with initial contents of N and P and negatively with polyphenol/N and (lignin + polyphe- nol) / N ratio (P < 0.01) throughout the sampling period. The low nutrient content, especially for N, of spontaneous vegetation is compensated by the greater decomposi- tion rate under natural conditions than that of introduced species. Management of the spontaneous plants is therefore an attractive alternative for sustainable agriculture.
Thesagro: | Adubação verde; Cafeicultura; Cajanus Cajan; Leguminosa; Leguminosae; Mineralização.
Thesaurus Nal: | Biogeochemical cycles; Crotalaria spectabilis; Fabaceae; Green manures; Lablab purpureus.
Categoria do assunto: | F Plantas e Produtos de Origem Vegetal
Registro original: | Embrapa Agrossilvipastoril (CPAMT)
Exemplares: | CPAMT - (7-1) - UPC - AP - DD -  -  -  - DIS