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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...
Preliminary critical nitrogen nutritional indices for lemon balm (Melissa offic...
Freitas, Sara; Arrobas, Margarida; Ferreira, I.Q.; Sousa, Maria João; Rodrigues, M.A.The management of crop fertilization presupposes previous diagnoses of soil fertility and plant nutritional status. In Europe, regular soil testing and plant analysis is mandatory for farmers receiving EU subsidies. Soil testing provides information on the potential availability of nutrients in the soil, a key component in the fertilization recommendation systems. By analyzing plant tissues we can access the nu...
Nitrogen content in above-ground plant parts as an aid to establish more accura...
Rodrigues, M.A.; Ferreira, I.Q.; Freitas, Sara; Verdial, João; Arrobas, MargaridaNitrogen is the nutrient applied most frequently as fertilizer in annual and perennial crops. In grapevine, nitrogen determines the vigor and yield of vine and several attributes of must quality (Akin et al., 2012; Pérez-Alvaréz et al., 2013). The close relationship between nitrogen application, vine performance and the quality of wine requires the rational use of fertilizer-N. In addition, the excessive use of...
Growth and nitrogen recovery in the above-ground biomass of eleven self-reseedi...
Arrobas, Margarida; Ferreira, I.Q.; Freitas, Sara; Dimande, Paulo; Pires, Jaime; Rodrigues, M.A.Most of the traditional dry-farmed olive orchards of the NE of Portugal are planted in shallow soils on sloping terrain. The olive yields obtained are usually low, due to the severe environmental constraints under which these orchards are grown. Growing olive trees in such hard conditions, may recommend the management of the orchards as organic, a low-input farming system from which the farmer profit can arise ...
O impacto do risco social num internamento pediátrico
Nascimento, J.; Ferreira, I.; Zilhão, C.; Pinto, S.; Ferreira, C.; Caldas, L.; Guedes, M.; Senra, V.Introdução: Os maus tratos a crianças correspondem a qualquer acção ou omissão não acidental, que ameace a sua segurança, dignidade e correcto desenvolvimento biopsicossocial. Pretendeu-se avaliar o seu impacto no internamento de Pediatria. Metodologia: Estudo retrospectivo dos doentes internados no Serviço de Pediatria de um hospital terciário entre 1/10/10 e 30/09/11, sinalizados ao Núcleo Hospitalar de Apoio...
Soil nitrogen availability in olive orchards after mulching legume cover crop r...
Rodrigues, M.A.; Correia, C.M.; Claro, Ana Marília; Ferreira, I.Q.; Barbosa, José Carlos; Moutinho-Pereira, J.M.; Bacelar, E.A.; Fernandes-Silva, A.A.A natural source of nitrogen (N) is needed to increase soil fertility in traditional olive orchards and to maintain the N nutritional status of olive trees. With this aim, we studied the introduction of legume cover crops in two olive orchards, which were converted into mulches and left on the ground as phytomass after they had been cut. The experiments were carried out in Suçães and Qta do Carrascal, NE Portug...
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