| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Biblioteca Rui Tendinha. |
|
Data corrente: |
27/07/2015 |
|
Data da última atualização: |
27/07/2015 |
|
Autoria: |
LEITE, C. A. M. |
|
Título: |
Modelo econométrico dos mercados interno e de exportação de soja no Brasil. |
|
Ano de publicação: |
1975 |
|
Fonte/Imprenta: |
Viçosa : UFV, 1975. |
|
Páginas: |
73 p. |
|
Idioma: |
Português |
|
Notas: |
Dissertação (Mestrado)- UFV, Viçosa- MG. |
|
Conteúdo: |
Diante de condições relativamente favoráveis do mercado externo, nos últimos anos, ocorreu um desenvolvimento bastante acentuado da produção e exportação brasileira de soja e subprodutos. Para um produto de importância, como a soja, cujos mercados interno e externo se encontram em expansão, políticas de preço e produção requerem compreensão dos efeitos das variações de preços sobre as quantidades ofertadas e demandadas, isto é, das relações estruturais de oferta e procura agregada do produto. Utilizando-se de dados secundários, foram estimadas as relações estruturais de oferta e demanda de soja no mercado interno, as relações de demanda de exportação e examinaram-se os efeitos das variáveis que afetam os preços no mercado interno. De posse das estimativas, verificou-se o custo social de uma políticas de preços para o setor. Concluiu-se que políticas governamentais com objetivo de incremento de produção terão mais efeito nos incentivos a preços do produto que nos preços de fertilizantes. A demanda de soja para exportação mostrou-se altamente dependente dos preços recebidos pelos exportadores, sendo ainda afetada pelos preços de amendoim e óleo de soja do mercado internacional. |
|
Palavras-Chave: |
Aspectos economicos; Brasil; Brazil; Econometric models; Econometrics models; Economia rural; Economic aspects; Exportacao; Exportation; Glycine max; Intern market; International market; Markets; Mercado; Mercado externo; Mercado interno; Modelo econometrico; Soja; Soybean; Soybeans. |
|
Categoria do assunto: |
-- |
|
Marc: |
LEADER 02206nam a2200373 a 4500
001 1007156
005 2015-07-27
008 1975 bl uuuu m 00u1 u #d
100 1 $aLEITE, C. A. M.
245 $aModelo econométrico dos mercados interno e de exportação de soja no Brasil.
260 $aViçosa : UFV$c1975
300 $a73 p.
500 $aDissertação (Mestrado)- UFV, Viçosa- MG.
520 $aDiante de condições relativamente favoráveis do mercado externo, nos últimos anos, ocorreu um desenvolvimento bastante acentuado da produção e exportação brasileira de soja e subprodutos. Para um produto de importância, como a soja, cujos mercados interno e externo se encontram em expansão, políticas de preço e produção requerem compreensão dos efeitos das variações de preços sobre as quantidades ofertadas e demandadas, isto é, das relações estruturais de oferta e procura agregada do produto. Utilizando-se de dados secundários, foram estimadas as relações estruturais de oferta e demanda de soja no mercado interno, as relações de demanda de exportação e examinaram-se os efeitos das variáveis que afetam os preços no mercado interno. De posse das estimativas, verificou-se o custo social de uma políticas de preços para o setor. Concluiu-se que políticas governamentais com objetivo de incremento de produção terão mais efeito nos incentivos a preços do produto que nos preços de fertilizantes. A demanda de soja para exportação mostrou-se altamente dependente dos preços recebidos pelos exportadores, sendo ainda afetada pelos preços de amendoim e óleo de soja do mercado internacional.
653 $aAspectos economicos
653 $aBrasil
653 $aBrazil
653 $aEconometric models
653 $aEconometrics models
653 $aEconomia rural
653 $aEconomic aspects
653 $aExportacao
653 $aExportation
653 $aGlycine max
653 $aIntern market
653 $aInternational market
653 $aMarkets
653 $aMercado
653 $aMercado externo
653 $aMercado interno
653 $aModelo econometrico
653 $aSoja
653 $aSoybean
653 $aSoybeans
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Biblioteca Rui Tendinha (BRT) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
|
|
|
Registro Completo |
|
Biblioteca(s): |
Biblioteca Rui Tendinha. |
|
Data corrente: |
29/11/2017 |
|
Data da última atualização: |
18/06/2019 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Circulação/Nível: |
A - 1 |
|
Autoria: |
PADOVAN, M. da P.; BROOK, R. M.; BARRIOS, M.; CRUZ-CASTILHO, J. B.; VILCHEZ-MENDOZA; COSTA, A. N. da.; RAPIDEL, B. |
|
Afiliação: |
Maria da Penha Padovan, Incaper; R.M. Brook, CATIE; M. Barrios, CATIE; J.B. Cruz-Castillo, UNA; S.J. Vilchez-Mendoza, CATIE; Aureliano Nogueira da Costa, Incaper; B. Rapidel, CIRAD. |
|
Título: |
Water loss by transpiration and soil evaporation in coffee shaded by Tabebuia rosea Bertol. and Simarouba glauca dc. compared to unshaded coffee in sub-optimal environmental conditions |
|
Ano de publicação: |
2018 |
|
Fonte/Imprenta: |
Agricultural and Forest Meteorology, v. 248, p. 1-14, 2018. |
|
Idioma: |
Inglês |
|
Conteúdo: |
There is increasing concern that due to land pressure and the need to maximize income, smallholder coffee farmers are increasingly being forced to cultivate in areas which are considered to be sub-optimal for coffee. Little is known about optimal coffee and tree combinations in these conditions and the degree to which crops and trees compete or are synergistic. In environmental conditions which were sub optimal for coffee cultivation in Nicaragua (1470 mm annual rainfall, 27 °C mean annual temperature and 455 m altitude compared to optima of 2000 mm, 23?24 °C and altitude between 1000 and 1400 m at that latitude, respectively), coffee and shade tree transpiration and soil evaporation were directly and separately measured in agroforestry (AFS) and full sun systems (FS). AFS was found to be a more efficient water user than FS because a greater proportion of rainfall was used by plant transpiration rather than being lost by soil evaporation. Plant transpiration accounted for 83% and 69% of evapotranspiration while soil evaporation represented 17% and 31%, in AFS and FS respectively. In AFS most of the water transpiration was due to coffee (72.5%) and much less by deciduous Tabebuia rosea (19%) and evergreen Simarouba glauca shade trees (8.5%). Furthermore, the study demonstrated the vastly different behaviour in water use by the shade trees. When in leaf, Tabebuia rosea transpired at four to six times the rate of evergreen Simarouba glauca, although crown sizes were similar. Contrasting precipitation between two consecutive years of study demonstrated that competition for water between coffee and shade tree occurred only in a severe dry season when coffee leaf water potential (LWP) reached its lowest values of ?2.33 MPa in AFS. It was concluded that in most circumstances there was sufficient water for both coffee and trees, that coffee in AFS was a more efficient user of water than FS coffee, and that evergreen Simarouba glauca was more suitable as coffee shade tree compared to deciduous Tabebuia rosea in the sub optimal environmental condition studied MenosThere is increasing concern that due to land pressure and the need to maximize income, smallholder coffee farmers are increasingly being forced to cultivate in areas which are considered to be sub-optimal for coffee. Little is known about optimal coffee and tree combinations in these conditions and the degree to which crops and trees compete or are synergistic. In environmental conditions which were sub optimal for coffee cultivation in Nicaragua (1470 mm annual rainfall, 27 °C mean annual temperature and 455 m altitude compared to optima of 2000 mm, 23?24 °C and altitude between 1000 and 1400 m at that latitude, respectively), coffee and shade tree transpiration and soil evaporation were directly and separately measured in agroforestry (AFS) and full sun systems (FS). AFS was found to be a more efficient water user than FS because a greater proportion of rainfall was used by plant transpiration rather than being lost by soil evaporation. Plant transpiration accounted for 83% and 69% of evapotranspiration while soil evaporation represented 17% and 31%, in AFS and FS respectively. In AFS most of the water transpiration was due to coffee (72.5%) and much less by deciduous Tabebuia rosea (19%) and evergreen Simarouba glauca shade trees (8.5%). Furthermore, the study demonstrated the vastly different behaviour in water use by the shade trees. When in leaf, Tabebuia rosea transpired at four to six times the rate of evergreen Simarouba glauca, although crown sizes were similar. Co... Mostrar Tudo |
|
Palavras-Chave: |
Coffee agroforestry; Coffee leaf water potential; Competition for water; Evapotranspiration. |
|
Categoria do assunto: |
J Meteorologia |
|
URL: |
https://biblioteca.incaper.es.gov.br/digital/bitstream/123456789/2879/1/BRT-PadovanBrooketal2017AgriculturalandForestMeteorology-padovan.pdf
https://www.sciencedirect.com/science/article/pii/S0168192317302873
|
|
Marc: |
LEADER 02921naa a2200241 a 4500
001 1017263
005 2019-06-18
008 2018 bl uuuu u00u1 u #d
100 1 $aPADOVAN, M. da P.
245 $aWater loss by transpiration and soil evaporation in coffee shaded by Tabebuia rosea Bertol. and Simarouba glauca dc. compared to unshaded coffee in sub-optimal environmental conditions$h[electronic resource]
260 $c2018
520 $aThere is increasing concern that due to land pressure and the need to maximize income, smallholder coffee farmers are increasingly being forced to cultivate in areas which are considered to be sub-optimal for coffee. Little is known about optimal coffee and tree combinations in these conditions and the degree to which crops and trees compete or are synergistic. In environmental conditions which were sub optimal for coffee cultivation in Nicaragua (1470 mm annual rainfall, 27 °C mean annual temperature and 455 m altitude compared to optima of 2000 mm, 23?24 °C and altitude between 1000 and 1400 m at that latitude, respectively), coffee and shade tree transpiration and soil evaporation were directly and separately measured in agroforestry (AFS) and full sun systems (FS). AFS was found to be a more efficient water user than FS because a greater proportion of rainfall was used by plant transpiration rather than being lost by soil evaporation. Plant transpiration accounted for 83% and 69% of evapotranspiration while soil evaporation represented 17% and 31%, in AFS and FS respectively. In AFS most of the water transpiration was due to coffee (72.5%) and much less by deciduous Tabebuia rosea (19%) and evergreen Simarouba glauca shade trees (8.5%). Furthermore, the study demonstrated the vastly different behaviour in water use by the shade trees. When in leaf, Tabebuia rosea transpired at four to six times the rate of evergreen Simarouba glauca, although crown sizes were similar. Contrasting precipitation between two consecutive years of study demonstrated that competition for water between coffee and shade tree occurred only in a severe dry season when coffee leaf water potential (LWP) reached its lowest values of ?2.33 MPa in AFS. It was concluded that in most circumstances there was sufficient water for both coffee and trees, that coffee in AFS was a more efficient user of water than FS coffee, and that evergreen Simarouba glauca was more suitable as coffee shade tree compared to deciduous Tabebuia rosea in the sub optimal environmental condition studied
653 $aCoffee agroforestry
653 $aCoffee leaf water potential
653 $aCompetition for water
653 $aEvapotranspiration
700 1 $aBROOK, R. M.
700 1 $aBARRIOS, M.
700 1 $aCRUZ-CASTILHO, J. B.
700 1 $aVILCHEZ-MENDOZA
700 1 $aCOSTA, A. N. da.
700 1 $aRAPIDEL, B.
773 $tAgricultural and Forest Meteorology$gv. 248, p. 1-14, 2018.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Biblioteca Rui Tendinha (BRT) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
