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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
05/11/2001 |
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Data da última atualização: |
05/11/2001 |
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Autoria: |
KANDA, K.; TAKAHSHI, M.; MIRANDA, C. H. B. |
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Afiliação: |
Japan International Research Center for Agricultural Sciences (JIRCAS). |
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Título: |
Nitrogen flow in agropastoral systems, Brazil. |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
JIRCAS Journal, Isukuba, n.9, p.23-31, mar. 2001. |
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Idioma: |
Inglês |
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Notas: |
CNPGC. |
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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. |
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Palavras-Chave: |
Agropastoral systems; Basilisk; Brasil; Brazilian savannas; Campo Grande; Integracao agricultura pecuaria; Mato Grosso do Sul. |
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Thesagro: |
Brachiaria Decumbens; Cerrado; Nitrogênio; Panicum Maximum; Pastagem; Soja. |
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Thesaurus Nal: |
Brazil; nitrogen; pastures; soybeans. |
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Categoria do assunto: |
-- |
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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.
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| 2. |  | CRUZ, J. S.; FEITOSA FILHO, J. C.; CAVALCANTE, J. F.; SOUSA, S. M. S. das C.; FEITOSA, H. P. da F.; PINTO, J. M. Efeitos da fertirrigação com chorume bovino sobre características físicas e químicas de solos. In: CONGRESSO BRASILEIRO DE FERTIRRIGFAÇÃO, 1.; MOSTRA DE EQUIPAMENTOS E PRODUTOS UTILIZADOS NA IRRIGAÇÃO E FERTIRRIGAÇÃO, 1., 2003, João Pessoa. Anais... João Pessoa: UFPB; Embrapa Semi-Árido; Areia : CCA, 2003. 1 CD-ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Semiárido. |
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| 3. | | FELIX, V. J. L.; FELIX, E. dos S.; DIAS, B. de O.; SOUSA, S. M. S. das C; FRAGA, V. da S.; ARAUJO FILHO, J. C. de. Relation of pedoenvironments with forms of nitrogen and phosphorus in semiarid soils. In: WORLD CONGRESS OF SOIL SCIENCE, 21., 2018, Rio de Janeiro. Soil science: beyond food and fuel: proceedings... Viçosa, MG: SBCS, 2019. v. 2, p. 25. WCSS 2018.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Solos. |
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| Registros recuperados : 3 | |
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