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Publications
Publications (24)
Foram estudados os efeitos da cobertura com redes de diferentes cores, incluindo com redes fotoseletivas, em pomares de macieiras da cultivar Gala, num período de 5 anos consecutivos (2020-2024). Em contexto de alterações climáticas, o uso de tecnologias de produção que reduzam o impacto de fenómenos extremos e a exposição das plantas aos diversos...
Essential oils (EOs) from Thymus mastichina (EO-thyme) and Helichrysum italicum (EO-curry) have wide commercial applications, but little is known about their ecotoxicity to aquatic life. We evaluated the lethal toxicity of both EOs toward standard freshwater (Daphnia. magna and Thamnocephalus platyurus) and saltwater (Artemia sp.) species. Dimethyl...
Hop (Humulus lupulus L.) leaves are rich in nutrients, particularly nitrogen (N). After harvest, they can be recycled through composting for use as a soil amendment. In this study, we report the effect of composts obtained from mixtures of hop leaves with other organic materials (wheat straw, farmyard manure, and ash from hop stems) at different ra...
A diminuição da produtividade dos ecossistemas e a mortalidade ocorrida devido à seca tem consequências na biodiversidade do solo. A capacidade do castanheiro suportar o aumento do aquecimento global previsto para as próximas décadas é incerta. A comunidade microbiana do solo tem um papel fundamental na sustentabilidade dos sistemas agroflorestais...
The interest in expanding the production of hops outside the traditional cultivation regions, mainly motivated by the growth of the craft brewery business, justifies the intensification of studies into its adaptation to local growing conditions. In this study, four field trials were undertaken on a twenty-year-old hop garden, over periods of up to...
Aim of study: Evaluation of the agronomic performance and chemical profile of four hop cultivars grown under Mediterranean conditions.
Area of study: The study was undertaken in Bragança, north-eastern Portugal.
Material and methods: The newly introduced cultivars (‘Columbus’, ‘Cascade’ and ‘Comet’) were compared with the well-stablished ‘Nugget’...
Over recent years, some hopyards of northeast Portugal have presented poorly developed plants and reduced productivity. In this study, an attempt was made to improve the homogeneity of hop fields and restore their productivity by using plant biostimulants as foliar sprays. The experimental apparatus included four field trials carried out in four pl...
In hops (Humulus lupulus L.), irrigation by flooding the inter-row can carry away suspended particles and minerals, causing gradients in soil fertility. The effect of more than 20 years of flooding irrigation on soil and plants was evaluated in two hop fields by measuring soil and plant variables in multiple points along the rows. In a second exper...
The application as soil drenches of three commercial products containing metalaxyl, phosphorous acid or potassium silicate, were studied as a means of controlling Phytophthora in chestnut (Castanea sativa Mill.) seedlings. In the metalaxyl treatment no plant deaths were recorded, whereas with the phosphorous acid and potassium silicate applications...
The harvesting of hops (Humulus lupulus L.) generates large amounts of nutrient-rich leaves that can be used in composting mixtures to add value to other organic resources on the farm. In this study, hop leaves were mixed with cow manure and wheat straw in several combinations with the aim of establishing guidelines on how farmers can manage the ra...
The use of amino acid and K-rich foliar sprays was evaluated in a commercial hop field in North-eastern Portugal. Four applications of an amino acid-rich foliar spray were performed in place of a second side dress N application of ⁓70 kg N ha⁻¹, which is usually applied by the farmer. The K-rich foliar spray was applied once at the cone developing...
In cultivated fields, patches of poorly developed vegetation often appear without a clear indication of what is affecting the growth of the plants. The purpose of this study was to investigate the causes behind these irregularities in the hop (Humulus lupulus L.) fields of NE Portugal which are greatly reducing crop yield and farmers’ profits and t...
Resumo—As alterações climáticas influenciam
diretamente as áreas de produção de castanha sendo
indispensável implementar medidas de adaptação e mitigação
para que estas se tornem mais resilientes. O objetivo deste
trabalho é avaliar as alterações na biomassa microbiana e na
respiração do solo em dois sistemas agroflorestais (soutos) jovens,
em situ...
Rapeseed acreage has been increasing fast in the last few decades and cultivated areas have expanded into lower latitudes because of the high value of its seed. This work aims to investigate the effect of sowing date on oilseed yield and how delayed accumulation of biomass can be compensated for nitrogen (N) applied as a top-dressing in a Mediterra...
Peppermint is an important aromatic and medicinal plant used across the world in pharmaceutical, cosmetic and food industries. However, there is a lack of agronomic research on this crop which hinders the implementation of best agricultural practice at farm level. Plant analysis, for instance, cannot be used as a tool to implement a suitable fertil...
A set of fertilizer experiments were conducted during three growing seasons with the aim of establishing sufficiency ranges and crop nutrient removals for Melissa officinalis L. Critical nutrient concentrations were determined by the Cate–Nelson method or by removing 10% of extreme high and low values, respectively if a positive response to a given...
Lemon verbena (Aloysia citrodora Paláu) is a perennial shrub native to South America, used in the food industry to add a lemon flavour to food and drink. The species has also caught the attention of the scientific community due to its potential pharmaceutical value. In spite of the useful work that has been carried out in recent years on the chemic...
Chestnuts have always been a marginal fruit crop, and the trees seldom fertilized as a result. Few studies have been devoted to the management of soil fertility and the nutritional status of this crop. This work reports results of soil and plant analyses of a population of respectively 1041 and 198 soil and leaf samples taken across nine municipali...
Stevia [Stevia rebaudiana Bertoni] is a crop expanding worldwide due to the increasing use in the food industry. The aims of this work were to check the adaptation of Stevia to the ecological conditions of the northeast of Portugal and to assess the response of the plant to the application of different rates of nitrogen, phosphorus and potassium as...
The SPAD-502 and the FieldScout CM 1000 chlorophyll meters were compared in their performance in diagnosing the nutritional status of plants. Leaves of a wide range of greenness were used to push the sensitivity of the tools to their limits. Both devices showed high reproducibility when used by different operators. The SPAD-readings were well corre...
European chestnut is the most important cash crop in the highlands of NE Portugal. However, limited data on cropping technique are available to help farmers make decisions. This work is motivated by the lack of data related to chestnut response to fertilizer application. It reports results from a field fertilization trial consisting of the applicat...
The adaptation of stevia to the growing conditions of NE Portugal is assessed, including the tolerance of this species to cold temperatures, and the potential to produce biomass when grown as an annual crop and when subjected to various N rates and two harvesting regimes. Almost all the plants died during the winter of 2014 (minimum temperatures pe...
En este trabajo se investigan los factores que pueden inventivar a las empresas portuguesas a un desempeño social. El estudio se basó en una muestra de diecinueve grandes empresas portuguesas, que figuran en el índice PSI 20, por un período de cinco años, desde 2005 a 2009. Se realiza un análisis factorial que se aplicó para identificar las dimensi...
