https://repositorio.ufba.br/handle/ri/3431 2026-04-17T19:52:20Z 2026-04-17T19:52:20Z Couto, Vitor de Athayde https://repositorio.ufba.br/handle/ri/14051 2022-08-26T14:02:48Z 2004-01-01T00:00:00Z

Family Secrets the Economy Is Unaware Of Couto, Vitor de Athayde This article discusses the limits of the concept of the family on the basis of observations from two case studies involving rural families in the Brazilian Northeast. It attempts, in the first place, to show the limitations of research on the home that assumes the family to be a nuclear one: a married couple and their unmarried children. It goes on to develop a critique of the economistic approach that treats the family as exclusively a unit of production and consumption. It concludes with observations about the family in the communities of Gericó and Valente, which are located in two quite different microregions of the state of Bahia. Families in these rural communities have proved to be more extensive and more complex than that of the model originally adopted, both with regard to who belongs to the family and with regard to these families' organization and objectives, which go well beyond the limits of mere units of production. © 2004 Latin American Perspectives. Artigo de Periódico

2004-01-01T00:00:00Z Silva, Simone Alves Cruz, Pedro Jacinto Carvalho, Fernando Irajá Félix de Nedel, Jorge Luís Silva, José Antônio González da Caetano, Vanderlei da Rosa Hartwig, Irineu Sousa, Cássia da Silva https://repositorio.ufba.br/handle/ri/13872 2022-08-26T14:03:41Z 2005-01-01T00:00:00Z

Análise de trilha para os componentes de rendimento de grãos em trigo Silva, Simone Alves; Cruz, Pedro Jacinto; Carvalho, Fernando Irajá Félix de; Nedel, Jorge Luís; Silva, José Antônio González da; Caetano, Vanderlei da Rosa; Hartwig, Irineu; Sousa, Cássia da Silva O objetivo do trabalho foi avaliar o efeito dos caracteres número de espiga por planta, número de grãos por espiga, massa média de grãos, tamanho da espiga e número de espiguetas por espiga sobre o rendimento de grãos, em trigo (Triticum aestivum L.) diferenciado quanto à presença e ausência do caráter "Stay-green", através de seus coeficientes de correlação e sua decomposição por meio da análise de trilha. Foram utilizados sete genótipos, obtidos através de avanços de gerações de 1999 a 2001, utilizando duas épocas de semeadura por ano, na estação de verão e inverno, sob condições de campo e telado, na Universidade Federal de Pelotas, RS. O experimento foi desenvolvido em delineamento de blocos casualizados com cinco repetições. A análise de trilha permite identificar o componente primário MMG, como o de maior potencial para seleção de constituições genéticas superiores para rendimento de grãos. Artigo de Periódico

2005-01-01T00:00:00Z Walker, Robert Perz, Stephen Marcellus Caldas, Marcellus Silva, Luiz Guilherme Teixeira https://repositorio.ufba.br/handle/ri/7532 2022-08-26T14:03:50Z 2002-04-01T00:00:00Z

Land use and land cover change in forest frontiers: the role of household life cycles Walker, Robert; Perz, Stephen; Marcellus Caldas, Marcellus; Silva, Luiz Guilherme Teixeira Tropical deforestation remains a critical issue given its present rate and a widespread consensus regarding its implications for the global carbon cycle and biodiversity. Nowhere is the problem more pronounced than in the Amazon basin, home to the world’s largest intact, tropical forest. This article addresses land cover change processes at household level in the Amazon basin, and to this end adapts a concept of domestic life cycle to the current institutional environment of tropical frontiers. In particular, it poses a risk minimization model that integrates demography with market-based factors such as transportation costs and accessibility. In essence, the article merges the theory of Chayanov with the household economy framework, in which markets exist for inputs (including labor), outputs, and capital. The risk model is specified and estimated, using survey data for 261 small producers along the Transamazon Highway in the eastern sector of the Brazilian Amazon. Artigo de Periódico

2002-04-01T00:00:00Z Hernanz, J. L. Silva, Heraldo Peixoto da Cerisola, C. Sánchez-Girón, V. https://repositorio.ufba.br/handle/ri/7290 2022-08-26T14:03:01Z 2000-10-01T00:00:00Z

An empirical model to predict soil bulk density profiles in field conditions using penetration resistance, moisture content and soil depth Hernanz, J. L.; Silva, Heraldo Peixoto da; Cerisola, C.; Sánchez-Girón, V. Cylindrical soil probes measuring 300 mm in diameter by 300 mm in height were prepared in the laboratory using samples extracted from a well drained loamy soil (FAO classification: Vertic Luvisol). These probes were compacted at different moisture contents [3, 6, 9, 12, 15 and 18 (% w/w)] and using different compaction energies (9.81, 49.05, 98.1 and 981 J). The soil penetration resistance was determined by means of the ASAE 129 mm2 base area cone and seven other different cones with base sizes of 175, 144, 124, 98, 74, 39 and 26 mm2. The variability of the penetration resistance measurements increased as the size of the cone decreased. Nevertheless, the penetration resistance values proved to be independent of the cone used, as long as the size of the latter was equal to or greater than 98 mm2. This confirms the possibility of using cones with areas smaller than the ASAE standard when measurements are to be carried out in dry soils with high levels of mechanical resistance. The experimental data were used to develop an empirical model, a linear additive model on a log–log plane, capable of estimating soil bulk density depending on soil penetration resistance, soil moisture content and depth. This model has provided good results under field conditions and has allowed soil bulk density profiles and accumulated water profiles to be accurately estimated. Elsevier Artigo de Periódico

2000-10-01T00:00:00Z