| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Corte. |
|
Data corrente: |
05/11/2001 |
|
Data da última atualização: |
05/11/2001 |
|
Autoria: |
KANDA, K.; TAKAHSHI, M.; MIRANDA, C. H. B. |
|
Afiliação: |
Japan International Research Center for Agricultural Sciences (JIRCAS). |
|
Título: |
Nitrogen flow in agropastoral systems, Brazil. |
|
Ano de publicação: |
2001 |
|
Fonte/Imprenta: |
JIRCAS Journal, Isukuba, n.9, p.23-31, mar. 2001. |
|
Idioma: |
Inglês |
|
Notas: |
CNPGC. |
|
Conteúdo: |
Agropastoral systems that combine soybean and grasses in a crop rotation have been proposed for sustaining grassland productivity in the low-fertility soils of the Brazilian savanna. We studied the nitrogen flow under an agro-pastoral system developed in 1993 in a Purple Red Latosol in Campo Grande, MS. Four cropping systems were included: continuous soybean cropping, soybean cropping after 4 years of grass cultivation. continuous grass cultivation, grass cultivation after 4 years of soybean cropping. The rate of N fixation in soybean was determined by the N difference method and 15N natural abundance method. A non-modulating isoline, T201, was used as a control in both methods. The rate of N2 fixation rangel from 23 to 51% of the total plant N. The amount of N taken out as grains was larger than the amount of fixed N in soybean. the amount of entering the system through rainwater was 6 kgN/ha/yr. Nitrato accumulating in soil from the surface to a deph of 100 cm under soybeans indicated the potential leaching of nitrate. The estimated amount of nitrate leaching from the soybean fields was large compared with that from the grasslands. A large negative N balance of 134-211 kgN/ha/yr was estimated in the soybean fields, whereas the N balance in the grasslands was a sligtly negative. |
|
Palavras-Chave: |
Agropastoral systems; Basilisk; Brasil; Brazilian savannas; Campo Grande; Integracao agricultura pecuaria; Mato Grosso do Sul. |
|
Thesagro: |
Brachiaria Decumbens; Cerrado; Nitrogênio; Panicum Maximum; Pastagem; Soja. |
|
Thesaurus Nal: |
Brazil; nitrogen; pastures; soybeans. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02204naa a2200361 a 4500
001 1324250
005 2001-11-05
008 2001 bl uuuu u00u1 u #d
100 1 $aKANDA, K.
245 $aNitrogen flow in agropastoral systems, Brazil.
260 $c2001
500 $aCNPGC.
520 $aAgropastoral systems that combine soybean and grasses in a crop rotation have been proposed for sustaining grassland productivity in the low-fertility soils of the Brazilian savanna. We studied the nitrogen flow under an agro-pastoral system developed in 1993 in a Purple Red Latosol in Campo Grande, MS. Four cropping systems were included: continuous soybean cropping, soybean cropping after 4 years of grass cultivation. continuous grass cultivation, grass cultivation after 4 years of soybean cropping. The rate of N fixation in soybean was determined by the N difference method and 15N natural abundance method. A non-modulating isoline, T201, was used as a control in both methods. The rate of N2 fixation rangel from 23 to 51% of the total plant N. The amount of N taken out as grains was larger than the amount of fixed N in soybean. the amount of entering the system through rainwater was 6 kgN/ha/yr. Nitrato accumulating in soil from the surface to a deph of 100 cm under soybeans indicated the potential leaching of nitrate. The estimated amount of nitrate leaching from the soybean fields was large compared with that from the grasslands. A large negative N balance of 134-211 kgN/ha/yr was estimated in the soybean fields, whereas the N balance in the grasslands was a sligtly negative.
650 $aBrazil
650 $anitrogen
650 $apastures
650 $asoybeans
650 $aBrachiaria Decumbens
650 $aCerrado
650 $aNitrogênio
650 $aPanicum Maximum
650 $aPastagem
650 $aSoja
653 $aAgropastoral systems
653 $aBasilisk
653 $aBrasil
653 $aBrazilian savannas
653 $aCampo Grande
653 $aIntegracao agricultura pecuaria
653 $aMato Grosso do Sul
700 1 $aTAKAHSHI, M.
700 1 $aMIRANDA, C. H. B.
773 $tJIRCAS Journal, Isukuba$gn.9, p.23-31, mar. 2001.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Corte (CNPGC) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
| Registros recuperados : 7 | |
| 4. |  | KANDA, K.; MIRANDA, C. H. B.; TAKAHASHI. M.; MACEDO, M. C. M. Nitrogen dynamics in agro-pastoral system of Brazil. In: SUENAGA, K.; OSHIBE, A.; TANIGUHI, T. (Ed.). Development of sustainable agro-pastoral systems in the subtropical zone of Brazil. Tsukuba: JIRCAS, 2004. p. 19-23. (JIRCAS. Working Report, 36). 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.| Biblioteca(s): Embrapa Gado de Corte. |
|   |
| 6. | | MIRANDA, C. H. B.; MACEDO, M. C. M.; KANDA, K.; NAKAMURA, T. Soil organic residues accumulation in agro-pastoral systems in the cerrados of Brazil. In: SUENAGA, K.; OSHIBE, A.; TANIGUHI, T. (Ed.). Development of sustainable agro-pastoral systems in the subtropical zone of Brazil. Tsukuba: JIRCAS, 2004. p. 29-33. (JIRCAS. Working Report, 36). 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.| Biblioteca(s): Embrapa Gado de Corte. |
| |
| 7. | | KANNO, T.; MACEDO, M. C. M.; NAKAMURA, T.; YOSHIMURA, Y.; FUKUDA, E.; KANDA, K.; NAKANISHI, N.; SAITO, M.; ANDO, Y. Grassland management technology for sustainable agro-pastoral systems in the subtropical zone of Brazil. In: SUENAGA, K.; OSHIBE, A.; TANIGUHI, T. (Ed.). Development of sustainable agro-pastoral systems in the subtropical zone of Brazil. Tsukuba: JIRCAS, 2004. p. 5-13. (JIRCAS. Working Report, 36). 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.| Biblioteca(s): Embrapa Gado de Corte. |
| |
| Registros recuperados : 7 | |
|
| Nenhum registro encontrado para a expressão de busca informada. |
|
|
