Data/hora: 12/06/2024 08:55:13

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 16/06/2004
Data da última atualização: | 16/06/2004
Autoria: | KANDA, K.; MIRANDA, C. H. B.; TAKAHASHI. M.; MACEDO, M. C. M.
Afiliação: | JIRCAS (Owashi, Japão).
Título: | Nitrogen dynamics in agro-pastoral system of Brazil.
Ano de publicação: | 2004
Fonte/Imprenta: | In: SUENAGA, K.; OSHIBE, A.; TANIGUHI, T. (Ed.). Development of sustainable agro-pastoral systems in the subtropical zone of Brazil. Tsukuba: JIRCAS, 2004.
Páginas: | p. 19-23.
Série: | (JIRCAS. Working Report, 36).
Idioma: | Inglês
Notas: | CNPGC. Proceedings of the Workshop on the results and prospects of comprehensive studies on the development of sustainable agro-pastoral systems in the subtropical zone of Brazil, 2003.
Conteúdo: | In 1999, soil samples were taken from a field experiment on agro-pastoral  system initiated in 1993 in a Purple Red Latosol in Campo Grande, MS, Brazil, from a) a field with continuous soybean cropping; b) a field with soybean cultivation after 4 years of  use as a grassland (rotational soybean);  c)continuous grassland;  d) grassland planted after 4 years of soybean cultivation (rotational grassland), e) degraded grassland;  and  f)  original Cerrados forest. Total C and N contents and mineralization potentials were determined. For  C and N mineralization studies we developed a new anaerobic incubatio method. Results obtained indicated that replacement of the Cerrados forest by a pure grassland and exploitation without proper cattle management and fertilizer application led to a decrease in both total C and N contents. Continuous cultivation of soybean on such a degrated  grassland area induced a further decrease, which could be alleviated by rotation with a grassland. On the other hand, soil  C and N mineralization potentials were not appreciably affected, indicatingthat  grassland degradation did not affect these parameters. Further, we studied nitrogen flow under this agro-pastoral system. A large negative N balance was estimated in the soybean fields, whereas the N balance in the grasslands was  slightly negative.
Palavras-Chave: | Agropastoral systems; Brasil; Brazilian savannas; Integração agricultura pecuária.
Thesagro: | Cerrado; Nitrogênio.
Thesaurus Nal: | Brazil; nitrogen.
Categoria do assunto: | --
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (10497-1) - UPC - PL - -- - 630 - S944d -  - DIS