Rapeseed is an important crop for several European countries and for many others such as Canada and China. Rapeseed oil may have several industrial uses (Sonntag, 1995) and shows excellent properties for the manufacture of biodiesel (Körbitz, 1995). Rapeseed oil may also present high food quality, namely CANOLA (Canadian Oilseed Low-Acid) and European “double-zero” varieties (erucic acid in the oil and glucosin...
In the last decades Portuguese olive growers spent a substantial part of their gross return to face costs of manually cultural practices, due to high price of labour. The mechanization of field operations has been the solution for this problem. As a result of research, transplanters with laser systems, pruning equipment and mechanical harvesters are becoming usual on olive growing. However the price of these eq...
In the last decades olive growers spent a substantial part of their gross return to face high costs of manually cultural practices, due to shortage of manpower. Olive crop is in a critical situation due to low product price and high production costs. In order to face the problem it is mandatory to increase competitiveness on the global market, reducing costs and improving fruit quality. Low mechanization level ...
Portugal necessita de incorporar 10% de biocombustíveis nos combustíveis convencionais até 2020. Tudo indica que se estas metas forem atingidas, sê-lo-ão à custa da importação das matérias- primas. A colza pode ajudar a mitigar o problema, na medida em que atinge produtividades interessantes em sequeiro. A técnica cultural é muito semelhante à dos cereais de inverno, o que facilita a sua inclusão nos sistemas d...
The rapeseed production in the world has more than doubled in the last twenty years. Total world production increased from 26.7 x 106 in 1992 to 62.5 x 106 in 2011 [1]. The increase in rapeseed production has been stimulated by the improved quality of the oil for human consumption, but also due to the increased demand for the production of biodiesel. Rapeseed production is widespread in cold temperate European ...
Cultivo de colza para produção de biodiesel ; O presente trabalho teve como objetivo principal estudar a adaptação da colza às condições de cultivo do Nordeste de Portugal. Procedeu-se ainda à determinação laboratorial do teor de óleo em sementes de colza. A partir de óleos alimentares usados foi produzido biodiesel e determinados os índices de iodo e de acidez, de acordo com as normas EN14111 e EN14104, respe...
The rapeseed production in the world has more than doubled in the last twenty years. Total world production increased from 26.7 x 106 in 1992 to 62.5 x 106 in 2011 [1]. The increase in rapeseed production has been stimulated by the improved quality of the oil for human consumption, but also due to the increased demand for the production of biodiesel. Rapeseed production is widespread in Europe. However, in the ...
The main goal of this paper was to assess the greenhouse gas (GHG) intensity of olive oil production in Portugal. A life-cycle model and inventory were implemented for the entire production process, including a comprehensive analysis of olive cultivation, olive oil extraction, packaging, and distribution. Data originates from five differently-sized Portuguese olive growers and from a total of six olive oil mill...
The main goal of this paper was to assess the greenhouse gas (GHG) intensity of olive oil production in Portugal. A life-cycle model and inventory were implemented for the entire production process, including a comprehensive analysis of olive cultivation, olive oil extraction, packaging, and distribution. Data originates from five differently-sized Portuguese olive growers and from a total of six olive oil mill...
Na Primavera de 2009 foi instalado em S. Pedro Vale do Conde, em Mirandela, um olival em duas densidades 4 x 1,35 m e 7 x 3,5 m. Na densidade 4 x 1,35 m foram instaladas três cultivares: Cobrançosa, Negrinha e Arbequina. Na densidade 7 x 3,5 m foram instaladas as cultivares: Cobrançosa, Madurai e Verdeal Transmontana. O olival foi instalado num solo franco-arenoso, com 1% de matéria orgânica e pH em água de 4,3...
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