The productivity of different lettuce groups and roquette was evaluated when sown in two different periods and cultivated either singly or intercropped. Theses experiments were carried out in Jaboticabal, São Paulo State, Brazil. The first growing period was from May to August (Autumn-Winter) and the second from September to November (Spring) of 2001. The experimental design was a randomized complete block with four replications. The treatments consisted of the combination of the following factors levels: lettuce groups (crisp, cv. Vera; looseleaf, cv. Elisa; and crisphead lettuce, cv.
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Showing items 1 through 9 of 45.-
Library ResourceJournal Articles & BooksDecember, 2007Brazil
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Library ResourceJournal Articles & BooksDecember, 2008
The degradation of soils with high sand content, in the southwest of the state of Rio Grande do Sul, is due to the vegetal cover withdrawal, forming sandy areas called "areais", which pose a risk to animal husbandry and the prairie ecosystem. A technique of revegetation with cover crops such as Avena strigosa Schieb. and Lupinus albescens H. et Arn., was developed to reduce the soil particle movement by eolic erosion.
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Library ResourceConference Papers & ReportsJuly, 2008
Esta pesquisa aborda a atividade madeireira sob o regime de concessão florestal desenvolvido no Estado do Acre. Os objetivos do presente estudo são: identificar o custo da produção do manejo florestal sustentável (MFS) para produção madeireira, tendo como base a Floresta Estadual do Antimary (FEA); e, quantificar o valor, a ser pago pela terra, numa área destinada como floresta pública de produção, no ano de 2005. Para tal, foi considerada, como premissa básica, um ciclo de corte de 15 anos.
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Library ResourceJournal Articles & BooksDecember, 2010Brazil
Rural settlements in Brazil were created in order to confront pressures and are characterized by the lack of planning prior to the diagnosis and implementation of the natural resources related to land suitability evaluation, distribution of classes such as topography, rivers system, vegetation, and support mechanisms.
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Library ResourceJournal Articles & BooksDecember, 2004Brazil
The vegetation cover plays a key role in protection and conservation of natural resources, particularly concerning soils. This study had as objective to analyze space and time dimensions of anthropic influence on the vegetation cover in part of the semi-arid region of the Ceará State, Brazil. LANDSAT TM-5 satellite images of 1985 and 1994 combined with geoprocessing techniques were used to verify the hypothesis of intensification of environmental degradation. Maps of the vegetation cover, land use, soils, and hydrography were elaborated.
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Library ResourceJournal Articles & BooksDecember, 2010
The process of natural regeneration in an area degraded for the construction of the Camargos hydroelectric plant dam, MG, was analyzed 155 months after the planting for its reclamation. The analyses were done in function of the distance to the river, soil compaction and distance of the seed sources. The survey of the natural regeneration was done in plots of 2 x 15m allocated every 10m along three transects (15m width and variable length) parallel to the slope direction. All plants with DBH
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Library ResourceJournal Articles & BooksDecember, 2007
The advance of the agricultural frontier, characterized by the conversion of natural ecosystems into cultivated areas, was intensified in the last decades. Most of the practices used to manage soils cause changes in the soil quality and soil organic matter (SOM) dynamics. Studying the impact of different management systems is essential to choose the most adequate soil management practices.
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Library ResourceConference Papers & ReportsJuly, 2008Brazil
O MIMES – Multi-scale Integrated Model of the Earth Sytems Ecological Services é o primeiro modelo global a relacionar a dinâmica entre a tecnologia, produção e bem-estar econômico e os bens e serviços ecossistêmicos do sistema dinâmico da Terra, de forma espacializada. É um “meta-modelo” que representa uma síntese de uma simplificação dos diversos modelos globais dinâmicos existentes nas ciências naturais e sociais em um nível intermediário de complexidade. O objetivo do MIMES é simular o sistema integrado da Terra e avaliar a dinâmica e os valores dos serviços dos ecossistemas.
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Library ResourceConference Papers & ReportsJuly, 2008
A água é essencial à sobrevivência humana. Uma economia política humanizada, isto é dirigida para a satisfação das necessidades básicas, deve preocupar-se com a questão da disponibilidade e distribuição de água. No que diz respeito à satisfação das necessidades básicas, podemos afirmar que é relativamente fácil e barato fornecer água para todos. Porque razão, então existe uma desigualdade na distribuição? Esta desigualdade representa uma violação séria de um direito humano, como será desenvolvido à frente, e não deverá ser tolerada.
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Library ResourceJournal Articles & BooksDecember, 2003
This work was carried ou to indicate the available areas for legal reserve maintenance aiming to provide a basis for discussing the issue of extending legal reserve areas in the Brazilian Amazonia.
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