Maria Oliveira

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Verified

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• Doctor of Engineering
• Professor Associate at Polytechnic Institute of Coimbra

This study explores the integration of circular economy (CE) concepts within horticultural research, assessing the reliability and depth of their application in scientific discourse. A bibliometric analysis was conducted on 221 articles published between 2016 and 2024, utilising the PRISMA framework, VOSviewer version 1.6.20, and MAXQDA version 24....

Young farmers are fundamental for the generational renewal of agricultural holdings, their modernization and implementation of innovations, but the installation rate success is very low. The objective of the study was to better understand the main constraints to the installation of young farmers. The survey methodology was used, applied to young fa...

Weeds management are the main crop protection issue in rice cultivation, responsible by about 30% of production losses in the field. Rice cultivation provides stability revenues to rural populations, in swamp ecosystems, wetlands, and lowlands, even in soils with high salinity, where other crops are not economic viable. To reduce yield losses, rice...

RESUMO Estudo sobre as perceções e as práticas culturais dos produtores de arroz na gestão de infestantes. Realizou-se um inquéri-to aos produtores, complementado com três reuniões (grupos focais) com técnicos e produtores. As infestantes identifica-das como as mais problemáticas foram as milhãs, seguidas pelo arroz-bravo. A leptocloa (erva-fina) c...

This paper aims to analyze the impact of Covid 19 on the agricultural enterprises and producer organizations in the Central Region of Portugal. An exploratory-descriptive qualitative analysis was carried out through interviews with a non-probabilistic sample of 13 agricultural enterprises of different sizes and four producer.organizations, based on...

Weeds are the main phytosanitary problem in rice cultivation. Overreliance on herbicides and lack of diversity in rice growing operations has produced intense selection for the evolution of resistant weed populations. This study focused on rice farmers' perceptions and practices for weed management. The applied methodology was a questionnaire, carr...

O objetivo do trabalho e perceber como é realizada a transmissão de preços entre o produtor e o consumidor no caso das frutas e horticolas

In the last two decades, Portugal suffered the effects of two global crises, the financial crisis and the COVID-19 pandemic, as well as the Common Agriculture Policy reforms. These crises had a great impact on the Portuguese economy, but it is completely unclear how they affected the dynamics of the Portuguese agrifood sector. This study’s objectiv...

Weeds are the main phytosanitary problem in rice crop. Over-reliance on herbicides and lack of crop operations range in the rice system have produced intense selection for the evolution of resistant weed populations. This study focused on rice farmers’ perceptions and attitudes towards weeds and agricultural practices for weed management. The metho...

This chapter aims to analyze the rice production system at the Baixo Mondego Valley to understand the main concerns. Field research and field trials were carried out to analyze rice production, marketing systems, and different irrigation alternatives. An analysis on the worries was made, and a correlational attempt was done. The results show a prod...

This paper aims to analyse the rice production system in the lower Mondego Valley, in Portugal, in order to understand the main concerns of farmers and risk perception. A field survey was conducted and rice production systems as well as marketing systems were analysed. A study on the worries was also made and a correlational attempt was done, consi...

Resumo: A agricultura biológica cria um mercado para bens e serviços ambientais, e os produtores podem ser recompensados pela sua gestão agroambiental através de preços premium e pela Política Agrícola Comum (PAC). O objetivo deste trabalho foi caracterizar os agricultores da Região Centro de agricultura do ponto de vista socioeconómico, além de av...

Citizen science is increasingly seen as an approach to gather information with an unprecedented time and territorial resolution, especially after the introduction of new IT solutions. This allows citizens to interact with researchers and provide detailed information about the scientific questions under appraisal in real time, and documented with ex...

Organic farming can play an important role in rural development and food production, by reinforcing the trend toward sustainable agriculture and its purpose of ecosystem conservation. The agribusiness of organic farming is particularly relevant in family farming, given the labor availability and the short marketing circuits. The innovative techniqu...

Irrigation districts play a decisive role in Portuguese agriculture and require the adaptation to the new water management paradigm through a change in technology and practices compatible with farmers’ technical know-how and economic sustainability. Therefore, improvement of water management, focusing on water savings and increasing farmers’ income...

6-Bromochromone-2-carboxylic acid (3) was synthesized by a microwave-assisted process. The optimization of the reaction was performed varying parameters, such as type of base/number of reagent equivalents, solvent, temperature and reaction time. The yield of the reaction was improved to 87%. The new synthetic route is versatile as several chromone-...

A fundamental issue in the implementation of the 2030 Agenda at the national level refers to the systemic analysis of interactions of global targets, considering the context-specific understanding of these interactions within a long-term vision. Another critical issue is how to apply and combine different approaches and tools to provide a consisten...

Aspergillus welwitschiae is a species of the Nigri section of the genus Aspergillus. In nature, it is usually a saprotroph, decomposing plant material. However, it causes the bole rot disease of Agave sisalana (sisal), a plant species used for the extraction of hard natural fibers, causing great economic loss to this culture. In this study, we isol...

In Portugal, the expansion of organic agriculture has become crucial within national agriculture context. The methodology included interviews with farmers and field visits to confirm the regional database. The first region to be analyzed was Beira Litoral and then, based on the results obtained, surveys were carried in the Lis Valley for a more del...

World production of processed tomato has shifted from the traditional producing countries to others that were previously importers, thereby increasing competition between companies and slowing down agro-industrial and trade growth. Portugal, one of the world’s leading producers of processed tomato has not been immune to this trend, as witnessed by...

The innovation of agricultural systems management is a determinant factor that guarantees adaptation to a new paradigm of global economy, environmental protection, and social requirements. The conventional concepts of innovation, applicable to new products and processes, do not consider many characteristics of the agricultural sector, such as socia...

Em Portugal, o número de explorações agríco­las decresceu 26% entre 2003 e 2013, sendo a taxa de substituição dos agricultores em Por­tugal inferior à média da UE-28. As variáveis­-chave do jovem agricultor na UE e em Por­tugal apresentam melhores valores dos que as mesmas para a agricultura considerando todas as classes etárias. Os agricultores...

This paper aims to examine the export competiveness of the Portuguese processed tomato sector through a set of indicators used to measure international competitiveness from 1981 to 2013. During the 2011-13 period, we observe a slight improvement in competitiveness indicators. The world price is an important variable for Portuguese tomato paste expo...

The main purpose of this article is to evaluate consumers’ perception of fresh Arbutus fruit and its market potential. This undervalued product from the local flora. Being a fruit that is not yet the target of marketing outside of its production area, an appraisal is needed to assess the perception of the market for fresh Arbutus fruit. To achieve...

This paper aims to analyze the milk prices transmission along the food chain in Portugal, temporally and spatially. The results show that the volatility on retail prices is small but happens after 2008. The farm gate price does not change when the price of package milk changes. In mainland, price transmission does not happen but for Azores the tran...

Para desenvolver um produto é necessário conhecer, além das suas características, todos os agentes de mercado desde o produtor até ao consumidor. Foi com este propósito que um grupo multidisciplinar da Escola Superior Agrária de Coimbra realizou um estudo com o objetivo de conhecer pontos fortes, oportunidades e fraquezas da fileira do medronho, id...

The purpose of this paper is to study the evolution and the structure of the Portuguese tomato processing industry. We intend to focus on the dynamics, the strategic behaviour and the structural changes that occurred in the Portuguese tomato industry throughout the period 1990-2005. An overview of the world and national production and trade in the...

The purpose of this paper is to study the evolution and the structure of the Portuguese processing tomato industry. We intend to pick up the dynamics, the strategic behaviour and structural the changes in the tomato industry in Portugal during the period of 1990-2005. An overview of world and domestic production and trade in the last two decades is...