43 documents found, page 1 of 5
Evaluating soil phosphorus tests and nutrient limitations in Mediterranean past...
Arrobas, Margarida; Raimundo, Soraia; Sawimbo, Almeida; Rodrigues, Nuno; Jongen, Marjan; Teixeira, Ricardo F.M.; Domingos, TiagoReliable phosphorus (P) fertilization guidelines for Mediterranean pastures remain uncertain due to inconsistent soil testing methods, the complexity of mixed-species systems, and the neglect of other limiting nutrients. This study primarily aimed to identify reliable soil P tests and secondarily to explore potential nutrient limitations by assessing seven acidic Portuguese soils under Mediterranean conditions ...
White Lupin and Hairy Vetch as Green Manures: Impacts on Yield and Nutrient Cyc...
Raimundo, Soraia; Arrobas, Margarida; Ribeiro, António C.; Rodrigues, Manuel ÂngeloOrganic farming systems, which prohibit synthetic fertilizers, often rely on legumes for their ability to fix atmospheric nitrogen (N). In orchards, legumes can be established as cover crops between tree rows to enhance nutrient cycling. This study evaluated the effects of two legume cover crops, white lupin (Lupinus albus L.) and hairy vetch (Vicia villosa Roth), compared to a Control treatment with convention...
Nitrogen Fixation and Growth of Potted Olive Plants through Foliar Application ...
Rodrigues, M.A.; Raimundo, Soraia; Correia, Carlos M.; Arrobas, MargaridaGiven the importance of biological nitrogen (N) fixation in agroecosystems, using inoculants with phyllosphere N fixers effective across various crops would revolutionize agriculture. In this study, the application of an inoculant prepared from Methylobacterium symbioticum was tested on young olive trees. The pot experiment was arranged in a factorial design, with inoculant (Yes and No) and mineral N applied to...
Omitting the Application of Nitrogen or Potassium Reduced the Growth of Young C...
Arrobas, Margarida; Raimundo, Soraia; Correia, Carlos M.; Rodrigues, M.A.The chestnut tree (Castanea sativa Mill.) is gaining importance in the mountainous regions of southern Europe due to the high value of its fruits. It is essential to establish effective cultivation protocols, considering that this species is still relatively understudied. In this study, we present the outcomes of the initial establishment of a chestnut orchard conducted through a nutrient omission trial for fou...
Dolomitic limestone was more effective than calcitic limestone in increasing so...
Arrobas, Margarida; Conceição, Nuno; Pereira, Ermelinda; Martins, Sandra; Raimundo, Soraia; Brito, Cátia; Correia, Carlos M.; Rodrigues, M.A.In acid soils, when no-tillage farmers intend to apply lime, the question arises as to whether it should be incorporated into the soil or whether it can be left on the soil surface. In this study, two types of limestone, calcitic (Lcal) and dolomitic (Lmag), were tested in two olive groves of cv. Cobrançosa, with an initial pH of 4.9 (S. Pedro) and 5.5 (Raparigas). In S. Pedro, limestone was incorporated into t...
On sandy, boron-poor soils, liming induced severe boron deficiency and drastica...
Arrobas, Margarida; Raimundo, Soraia; Conceição, Nuno; Moutinho-Pereira, José; Correia, Carlos M.; Rodrigues, M.A.In the northeast of Portugal, like in many parts of the world, most soils are acidic, which may hamper crop productivity. This study presents the findings of a factorial experiment on olive (Olea europaea L.) involving three factors: (i) soil type [schist (Sch) and granite (Gra)]; (ii) cultivars [Cobrançosa (Cob) and Arbequina (Arb)]; and (iii) fertilizer treatments [liming (CaCO3) plus magnesium (Mg) (LMg), ph...
Large chestnut trees did not respond to annual fertiliser applications, requiri...
Arrobas, Margarida; Silva, João; Busato, Mariah Ruaro; Ferreira, Ana Carolina; Raimundo, Soraia; Pereira, Abel; Finatto, TacianeDue to the high value of the fruit, the European chestnut (Castanea sativa Mill.), usually grown in agroforestry systems, has been planted as a single species in orchards managed with increasingly intensive cropping practices, such as the regular use of fertilisers. This justifies research into establishing fertilisation programmes oriented towards ecological intensification. In this study, the results of fruit...
Lettuce response to the application of two commercial leonardites and their eff...
Arrobas, Margarida; Andrade, Monica; Raimundo, Soraia; Mazaro, Sergio Miguel; Rodrigues, M.A.The aim of the study was to compare the effect of two leonardites (Humitec & REG; and Humic Gold & REG;) and an organic compost (Nutrimais & REG;) with an untreated control on lettuce. The pot experiment was carried out in NE Portugal, in autumn 2019 and spring 2020. Humitec, Humic Gold and Nutrimais were applied alone or as a supplement to nitrogen (N), phosphorus (P) and potassium (K). The experiment was arra...
Leonardites ricas em ácidos húmicos e fúlvicos tiveram um efeito reduzido na co...
Arrobas, Margarida; Raimundo, Soraia; Rodrigues, M.A.O uso de substâncias húmicas na agricultura tem aumentado nos últimos anos, e as leonardites têm sido uma importante matéria-prima no fabrico de produtos comerciais ricos em ácidos húmicos e fúlvicos. Produtos à base de leonardite têm sido usados para melhorar as propriedades do solo e ajudar as plantas a suportar melhor stresses abióticos e bióticos. Neste estudo, os efeitos de duas leonardites comerciais (Hum...
Instalação de um coberto vegetal de leguminosas anuais de ressementeira em oliv...
Moredo, Nuno José Fernandes; Raimundo, Soraia; Arrobas, Margarida; Rodrigues, M.A.O uso de cobertos vegetais em pomares tem importantes efeitos no controlo da erosão, no teor de matéria orgânica do solo e na competição pelos recursos entre a vegetação herbácea e as árvores. Em sequeiro o tópico tem ainda mais relevância, devido à competição potencial da vegetação herbácea pela água, um fator determinante na produtividade. Se forem utilizados cobertos de leguminosas anuais de ressementeira na...