Liberalización comercial agrícola con costos de transporte y transacción elevados: evidencia para América Latina

Incluye Bibliografía

Aspectos determinantes del estado de la facilitación del transporte en América Latina: los casos de Colombia y el Perú (Comunidad Andina de Naciones)

Includes bibliography

Análise espacial de nutrientes e produção de alface cultivada em ambiente protegido

The objective of this work was to study spatial variability of some chemical soil attributes and lettuce production (total shoot fresh matter mass - MF; commercial shoot fresh matter mass - MFC; commercial shoot dry matter mass - MCS; and head commercial diameter - DCC) offering subsidies to the protected environment mapping in nutrients management areas in lettuce culture aiming for a higher productivity with application of fertilizers. The experiment was conducted in a protective environment (greenhouse) with lettuce irrigated by drip irrigation and sampling grid with 152 points. The special dependence analysis, determined by the variogram, was obtained with the aid of the GS+ Program. Considering the need for crop nutrients through the map obtained for element P (phosphorus) it was possible to establish two distinct areas for the application of this element in plantation fertilization. Through the lettuce yield maps obtained with MFC and DCC attributes was difficult to establish distinct areas for its management with data observed in only one crop cycle. Krigagem has proved useful for mapping the attributes studied.

Determinação da massa seca, teor de nutrientes e cobertura do solo de espécies semeadas no outono-inverno

Culture options for the autumn-winter season are a major problem for production systems under low rainfall. The aim of this study was to evaluate the effect of the sowing season on dry matter yield, nutrient content of the shoot and soil covering percentage of coverage plants on the soil on the intercrop: grain sorghum, rattlepods, pearl millet brachiaria grass and an area with weeds (fallow). The experiment was conducted under field conditions on an Oxisol (Haplustox), clay texture, in Selvíria, Mato Grosso do Sul, Brazil. The experimental design was a randomized block design with eight replications, two sowing seasons and five coverage treatments. When the sorghum culture of the first sowing season reached the harvest stage, the dry matter yield on the other treatments was evaluated. Results showed that sowing in March results in higher dry mass yield and higher soil coverage percentage in the studied species. In the first sowing season, Brachiaria brizantha presents higher dry matter yield and macronutrients extraction.

Nitrogênio, fósforo e potássio na produção de massa seca e no acúmulo de nutrientes em mudas de limeira ácida 'tahiti'

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Provisión de infraestructura de transporte en América Latina: experiencia reciente y problemas observados

Incluye Bibliografía

Hacia un desarrollo sustentable e integrado de la Amazonía: los corredores de transporte en la cuenca amazónica central-occidental y sus afluentes principales en Brasil, Colombia, Ecuador y Perú

Incluye Bibliografía

Infraestructura y servicios de transporte ferroviario vinculados a las vías de navegación fluvial en América del Sur

Incluye Bibliografía

Los desafíos del sistema de transporte en los países sin litoral de América del Sur

Incluye Bibliografía

Políticas integradas de infraestructura, transporte y logística: experiencias internacionales y propuestas iniciales

Incluye Bibliografía

La industria del transporte marítimo y las crisis económicas

Incluye Bibliografía

Infraestructura y equidad social: experiencias en agua potable, saneamiento y transporte urbano de pasajeros en América Latina

Incluye Bibliografía

El papel del transporte con relación a los Objetivos de Desarrollo del Milenio

Incluye Bibliografía

El desarrollo institucional del transporte en América Latina durante los últimos veinticinco años del siglo veinte

Incluye Bibliografía

La evaluación socioeconómica de concesiones de infraestructura de transporte: caso túnel El Melón, Chile

Incluye Bibliografía