|
|
|
| Registros recuperados: 1.893 | |
|
| |
|
| |
|
|
| Sick,Helmut; Gonzaga,Luiz Pedreira; Teixeira,Dante Martins. |
| The case of the Indigo, or Lear's Macaw, Anodorhynchus leari, is unique in South American ornithology. The species, although described more than 100 years ago, was known only through very few living specimens, which entered occasionally the bird trade, without any indication of their origins. It was presumed "probably some part of Brazil" (Salvadori, 1891). The last speculation was that it was unlikely, though not impossible, that the Indigo Macaw might not be an independem species, but rather, a hybrid between the two other well known blue macaws, Anodorhynchus hyacinthinus and A. glaucus (Voous, 1965). |
| Tipo: Info:eu-repo/semantics/article |
|
| Ano: 1986 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751986000300004 |
| |
|
| |
|
| |
|
|
| Griffiths, William E.. |
| A Bayesian approach is used to provide a framework for optimal input allocation for a stochastic production function with uncertain parameters. The chosen production function is a single-input version of a function which can exhibit positive or negative marginal risk. The sensitivity of optimal input allocation to the degree of risk aversion, the marginal risk parameter, and the assumed level of uncertainty about the parameters is examined. Using an example problem it is shown that parameter uncertainty will not always lead to a lower input level when a producer is risk averse. Some problems with the production function specification are uncovered, as is the incompatibility of some expected utility and stochastic assumptions. |
| Tipo: Journal Article |
Palavras-chave: Research Methods/ Statistical Methods; Risk and Uncertainty. |
| Ano: 1986 |
URL: http://purl.umn.edu/22898 |
| |
|
| |
|
| |
|
| |
|
|
| SAMPAIO, J. M. M.; RODRIGUES, J. A. S.. |
| As áreas de melhor adaptação para mangueira são aquelas onde as estações secas e chuvosas são bem defini das. O período seco deve ocorrer bem antes do florescimento, a fim de permitir um período de repouso vegetativo á planta, e prolongar-se até a frutificação para evitar os danos causados pelo ataque da antracnose e do oídio. Após frutificação, é benéfica a ocorrência de chuva afim desestimular o desenvolvimento e impedir a queda dos frutos. A quantidade de chuva pode variar entre 500 e 2.500mn anuais, desde que atendidas as condições referidas acima. |
| Tipo: Circular Técnica (INFOTECA-E) |
Palavras-chave: Cultivo de manga. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/638058 |
| |
|
| |
|
| |
|
|
| Knapp, Keith C.; Dinar, Ariel. |
| Irrigation with saline waters is a major problem in many parts of the world. Economic questions have usually been addressed using synthesized production functions and theoretically based soil salinity relations. The purpose of this paper is to estimate functions relating crop yield and salt accumulation in the soil to initial soil salinity and water quantity and quality. Crop response functions and dynamic salt balance relations are estimated from experimental data for alfalfa and cotton. The estimated functions are then used in a dynamic programming model to determine optimal water applications for different levels of initial soil salinity and crop and water prices. |
| Tipo: Journal Article |
Palavras-chave: Crop Production/Industries; Resource /Energy Economics and Policy. |
| Ano: 1986 |
URL: http://purl.umn.edu/32547 |
| |
|
|
| SCOLARI, D. D. G.. |
| Dentre as alternativas brasileiras para o aumento da producao nacional de graos, tanto para atendimentos do mercado interno como para exportacao, a regiao dos Cerrados do Brasil ja desempenha papel de destaque. A estagnacao da producao nacional de cereais, notadamente nos ultimos anos, decorrencia de frustacoes climaticas na regiao sul do Pais, com perdas substanciais de safras, demonstra claramente a necessidade de diversificacao espacial na producao agricola. Nesse contexto o aumento da oferta de alimentos a nivel nacional, atraves de intensificacao da agricultura nos Cerrados, visando principalmente ao aumento vertical da producao, se apresenta como grande alternativa da sociedade brasileira. Existe uma serie de fatores de natureza tecnica, politica e... |
| Tipo: Documentos (INFOTECA-E) |
Palavras-chave: Aspecto economico; Brasil; Production; Economic situation; Agriculture production; Budgets; Custos; Economics aspects; Metodologia; Região cerrados; Solos.; Análise Econômica; Agricultura; Cerrado; Economia; Produção; Produção Agrícola.; Agricultural products; Agriculture; Economic analysis; Brazil; Yields.. |
| Ano: 1986 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/547619 |
| |
|
|
| MacKenzie, John; Weaver, Thomas F.. |
| A model analyzing household substitution of fuelwood for other heating fuels is needed to clarify the relationship between energy prices and patterns of forest resource utilization. This paper employs the household production methodology to model fuelwood demand in Rhode Island. Data from a cross-sectional survey of 515 households are employed to test a discrete-choice model of household participation in wood-burning and a four-equation system modeling household production of heat and aesthetic benefits from fuelwood and stove capital. Control of selection bias via inclusion of an appropriate instrument allows analysis of aggregate demands. Some broad policy prescriptions applicable to the Northeast generally are presented. |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 1986 |
URL: http://purl.umn.edu/28884 |
| |
| Registros recuperados: 1.893 | |
|
|
|
