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- Influence of storage conditions on fruit quality of ‘Royal Time’ and ‘Royal Summer’ peach cultivarsPublication . Veloso, Abel; Ferreira, Dora; Gaspar, Pedro Dinis; Andrade, Luís Pinto de; Espirito Santo, Christophe; Silva, Pedro D.; Simões, Maria PaulaPeach is a very perishable climacteric fruit whose firmness may decay rapidly depending on the temperature. Refrigeration is usually used to delay ripening and maintain fruit quality. However, often temperature storage conditions are not optimized. This work aims to characterize the storage conditions (temperature and humidity) of three peach producers of Beira Interior region, Portugal. Additionally, correlate those conditions with peach quality evolution comparing two peach cultivars – Royal Summer and Royal Time – with similar harvest dates but very different acidity content. The three refrigeration chambers monitored have very distinct conditions of average air temperature, namely 8.29±3.53 °C (local C), 5.50±0.88 °C (local G) and 0.80±0.83 °C (local L) but similar high humidity, in an average range of 90%-98%. At harvest time, major differences were in fruit firmness and acidity. ‘Royal Summer’ firmness was 6.61 kgf and ‘Royal Time’ was 5.20 kgf. For all storage conditions, fruit firmness decrease faster for ‘Royal Time’ cultivar than for ‘Royal Summer’. The results suggest that in general farmers use inadequate range temperature for long storage period. For short periods of 7 days, conditions like those of local G allow fruit quality maintenance like firmness and loss of weight without problems of chilling injury, and, simultaneously, save energy that is also not only a desirable international goal but also contributes to decrease of production costs.
- Aplicação de modelos empíricos na avaliação do desempenho do pessegueiro ‘Catherine’ em dois anos consecutivosPublication . Ramos, António; Ferreira, Dora; Barateiro, Anabela; Ramos, Cristina; Fragoso, Preciosa; Lopes, Sandra; Amado, Carlos; Mesquita, Ricardo; Simões, Maria Paula; Gaspar, Pedro DinisA carga, ou seja, onúmero de frutos que permanece na árvore árvore após a fecundação e o vingamento do fruto, influencia o crescimento vegetativo, vegetativo,a produção, o tamanho e a qualidade dos frutos, o rendimento económico e a regularidade das produções (Johnson e Rasmussen ,1990). Em trabalho anterior anterior com o pessegueiro ‘Catherine’ em 2015 e2016 ,Ramos (2017 ) apresentou as bases do desenvolvimento de modelos empíricos para avaliar a eficiência produtiva e propôs a sua aplicação para estudar o efeito da carga no crescimento do fruto e, desse modo, estimar a capacidade produtiva a partir da medição do volume da árvore .