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Evaluation of the noise exposure of symphonic orchestra musicians
Rodrigues, M. A.; Freitas, Marisa; Neves, Paula; Silva, Manuela VieiraFor musicians, the impact of noise exposure is not yet fully characterized. Some inconsistencies can be found in the methodology used to evaluate noise exposure. This study aims to analyze the noise exposure of musicians in a symphonic orchestra to understand their risk for hearing loss, applying the methodology proposed by ISO 9612:2009. Noise levels were monitored among musicians during the rehearsal of eight...
Risk criteria in occupational environments: critical overview and discussion
Rodrigues, M. A.; Arezes, Pedro; Leão, Celina PintoThe current work can be seen as a starting point for the discussion of the problematic on risk acceptance criteria in occupational environments. Some obstacles to the quantitative acceptance criteria formulation and use were analyzed. A look to the long tradition of major hazards accidents was also performed. This work shows that organizations can have several difficulties in acceptance criteria formulation and...
Guidelines for fertilizer use in vineyards based on nutrient content of grapevi...
Arrobas, Margarida; Ferreira, I.Q.; Freitas, Sara; Verdial, João; Rodrigues, M.A.Plant analysis plays a major role in fertilizer recommendations for perennial tree crops and vines. Plantanalysis, however, does not quantify the rate of nutrients to apply. The approach developed in this worktakes into account the content of the nutrients in grapevine parts and their dynamic within the plantto assist in the estimation of the amount of fertilizer to apply. Groups of three vines were cut at grou...
Monitoring nitrogen nutritional status of vegetables in the social garden of Po...
Lopes, H.; Arrobas, Margarida; Freitas, Sara; Ferreira, I.Q.; Rodrigues, M.A.Urban agriculture is a global phenomenon. In developing countries urban agriculture has had crucial importance in alleviating problems of extreme poverty and unemployment of the populations of the larger cities. In developed countries has been particularly important during periods of economic depression. Nowadays, the urban agriculture in developed countries is increasing, aimed more at leisure, sports and recr...
Fertilização de lameiros naturais: produtividade e composição química da vegetação
Rodrigues, M.A.; Dias, D.; Pires, Jaime; Ferreira, I.Q.; Freitas, Sara; Aguiar, Carlos; Arrobas, MargaridaOs lameiros são pastagens seminaturais de montanha com elevada predominância no centro e Norte de Portugal, de elevado valor ecológico e a base de suporte da atividade pecuária local. A produtividade e a composição florística dos lameiros têm sido estudados em função de gradientes ecológicos diversos, mas poucos estudo têm incluído diferentes estratégias de fertilização com incorporação de micronutrientes. Nest...
Efeito de um coberto de leguminosas pratenses no estado nutricional de um oliva...
Dimande, Paulo; Arrobas, Margarida; Ferreira, I.Q.; Freitas, Sara; Rodrigues, M.A.O solo dos pomares e vinhas é cada vez mais gerido com cobertos vegetais. Os cobertos vegetais protegem o solo da erosão e incrementam o sequestro de carbono no solo, com aumento favorável do teor de matéria orgânica. Se forem utilizados cobertos vegetais de leguminosas semeadas, para além do efeito reforçado do sequestro de carbono, devido à maior produção de biomassa, acresce o aumento da pool de azoto (N) or...
The effect of different winter cover crops on sorghum nutritional status and dr...
Ferreira, I.Q.; Aguiar, Carlos; Arrobas, Margarida; Dias, D.; Freitas, Sara; Rodrigues, M.A.Growing winter cover crops has a great agroecological meaning, since it allow maintaining the residual inorganic N in the soil/plant system, thus avoiding leaching of N (Rodrigues et al., 2002). As winter cover crops, it can be grown diverse species (Jensen, 1992). If legume species were used, they can access atmospheric N through the establishment of a symbiotic relationship with N-fixing bacteria (Russelle, 2...
Nitrogen mineralized during sorghum growth after soil incorporation of differen...
Dias, D.; Aguiar, Carlos; Arrobas, Margarida; Rodrigues, M.A.Growing catch crops during the autumn/winter period is a strategy of high ecological significance since it allows reducing the residual inorganic-N present in the soil after the summer season (Rodrigues et al., 2002). Thus, winter catch crops reduce the risk of denitrification and nitrate leaching associated to the excess of rain of the autumn/winter months. Incidentally, the evergreen systems confer several ot...
A introdução de pastagens na rotação melhora a fertilidade do solo
Aguiar, Peltier; Arrobas, Margarida; Fereira, I.Q.; Freitas, Sara; Rodrigues, M.A.A rotação de culturas é a base da sustentabilidade dos sistemas de cultivo. A rotação de culturas permite diminuir os problemas fitossanitários e reduzir custos e impactes ambientais com o uso de pesticidas. A rotação de culturas podem também promover a fertilidade do solo se nela forem introduzidas leguminosas, devido à sua capacidade em obter azoto a partir da atmosfera. Na área das pastagens, as rotações são...
Agronomic performance of five rapeseed varieties grown for biodiesel in the nor...
Rodrigues, M.A.; Arrobas, Margarida; Almeida, ArlindoRapeseed 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...
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