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Ésteres combustíveis em motor de ciclo diesel sob condições de pré-aquecimento e variação no avanço de injeção
(Universidade Federal de Santa Maria, 2008-04-23)
The renewed interest in energy for biomass is supported by the need for different energy sources and the need to protect the environment. Recently, because of increases in
crude oil prices, limited resources of fossil oil ...
Épocas de menor risco de estresse hídrico e térmico para o feijoeiro na região central do Rio Grande do Sul
(Universidade Federal de Santa Maria, 2005-01-27)
The common bean is the main food of many Brazilians and it is produced in the whole national territory, wich means that this spcies cultivated in variety of meteorological conditions. In spite of its great importance, the ...
Produtividade, severidade de mancha de alternaria e deficiência hídrica em diferentes épocas de semeadura do girassol em Santa Maria - RS
(Universidade Federal de Santa Maria, 2009-12-15)
This study aimed to determine the occurrence of values of severity of injury caused by alternaria leaf spot and water deficit during the developmental cycle of three genotypes of sunflower and its relationship with ...
Comportamento dinâmico e mecânico do solo sob níveis diferenciados de escarificação e compactação
(Universidade Federal de Santa Maria, 2007-02-16)
Soil compaction under no-tillage system has been causing serious problems to plant growth and to agriculture machines operation due to high soil resistance to tillage. Soil chiseling is a possible solution, however, some ...
Estudo da dinâmica hídrica de um reservatório afetado pela construção de um segundo reservatório a montante
(Universidade Federal de Santa Maria, 2004-07-23)
The construction of reservoirs in sequence in the same basin has produced great problems in rural environment. It is supposed that reservoirs constructed in downstream of a second reservoir have their discharge affluent ...
Efeito de diferentes estratégias de irrigação sob as culturas de feijão (Phaseolus vulgaris L.) e milho (Zea mays L.) na região de Santiago, RS
(Universidade Federal de Santa Maria, 2007-02-16)
Water is one of the production factors that limit the most the output of cultivated plants. In regions in which the rain distribution is irregular, it may occur significant losses in the output of cultures. In these cases, ...
Estimativa da retenção de água em solos para fins de irrigação
(Universidade Federal de Santa Maria, 2007-03-08)
The purpose of the present work was to establish and to test pedotransfer functions for water retention the Rio Grande do Sul s soils. Water retention data were obtained from Solano Peraza s dissertation, Irriga System ...
Estudo comparativo entre a utilização real e a determinada pelo planejamento da mecanização agrícola em empresas rurais de soja e arroz
(Universidade Federal de Santa Maria, 2008-03-12)
The objective of this thesis was to carry out a study comparing actual utilization in rural businesses of soy and rice to that which is determined by agricultural mechanization planning. In this context, the specific ...
Avaliação de três sistemas de aplicação de produtos fitossanitários líquidos
(Universidade Federal de Santa Maria, 2004-05-06)
At present days agriculture has been looking for new technologies for quickly supplying the human needs in foods. It is undeniable that the use of machines in the agriculture as well as the discovery and application of new ...
Desempenho de um motor diesel de injeção indireta em função da variação do teor de biodiesel
(Universidade Federal de Santa Maria, 2008-10-01)
Due to the current world scenery of energy, the biodiesel presents a great potential as option to consumption of fuels of the finite sources. The largest use of the biodiesel in the world is with the methyl ester of soybean ...