Encontrados 16 documentos, a visualizar página 1 de 2
Effect of nocturnal ventilation on the occurrence of Botrytis cinerea in Medite...
Baptista, F.J.; Bailey, B.J.; Meneses, J.F.Botrytis cinerea is the causal agent of grey mould disease which is one of the most important diseases affecting tomato crops in unheated greenhouses. Nocturnal ventilation is a technique that can be used to reduce relative humidity inside unheated greenhouses. The main objectives of this research were to investigate the effect of ventilation management on the environmental conditions and on the disease severit...
Greenhouse Energy Consumption for Rose Production in Different Regions of Portu...
Baptista, F.J.; San Jose, E.; Guimaraes, A.C.; Navas, L.M.; Meneses, J.F.In this work results of an energy consumption study for rose production in multi-tunnel greenhouses, located in Porto (Pedras Rubras), Marinha Grande, Dois Portos, Zambujeira, Faro, Funchal and Ponta Delgada, are presented. The greenhouse considered with a surface area of about 1 ha had galvanised steel structure and was covered with three layer co-extruded plastic films. It was equipped with a hot water heatin...
Greenhouse Energy Consumption for Tomato Production in the Iberian Peninsula Co...
Baptista, F.J.; Silva, A.T.; Navas, L.M.; Guimaraes, A.C.; Meneses, J.F.Greenhouse climate models are a powerful tool which allows the simulation of inside environmental conditions as a function of external conditions, construction and environmental control equipments characteristics. They also permit to evaluate the energy consumption necessary to obtain the predefined conditions. A theoretical study of the greenhouse energy requirements for all year round tomato production in Por...
Ventilação nocturna de estufas não aquecidas
Baptista, F.J.; Meneses, J.F.As estufas utilizadas nas zonas de clima Mediterrâneo são normalmente estruturas simples com cobertura de material plástico e cuja principal técnica de condicionamento ambiental é a ventilação natural. A Botrytis cinerea é o agente responsável pela podridão cinzenta, doença que origina elevados prejuízos nalgumas culturas em estufas não aquecidas. Na cultura do tomate, esta doença pode ser responsável por perda...
Improving Greenhouse Heating in Portugal
Meneses, J.F.; Baptista, FátimaAlthough several new solutions for greenhouse heating and environmental control are being investigated all over the world; to reduce energy consumption and environmental impacts, to increase the efficiency of energy use for plant production in protected cultivation or to take advantage of the new renewable energy sources, in Portugal the great majority of producers still rely on more conventional heating system...
Development of a Warning System for Controlling Botrytis cinerea in Unheated To...
Baptista, Fátima J.; Bailey, B.J.; Meneses, J.F.Botrytis cinerea is the causal agent of grey mould disease which is one of the most important diseases affecting tomato crops in unheated greenhouses. As a prophylactic measure growers usually apply large quantities of chemical fungicides for its control. Nocturnal ventilation is an effective way to reduce high relative humidity inside greenhouses and can be a useful tool to minimise chemical use in unheated gr...
Consumo de energia e custo energético em aquecimento na produção de rosas em es...
Baptista, F.J.; Meneses, J.F.Neste trabalho apresentam-se os resultados de um estudo sobre os locais mais adequados, o consumo de energia e respectivo custo energético em aquecimento durante a estação fria, em estufas de roseiras, localizadas em diferentes zonas do país, perto do mar.
Determinação de Coeficientes de Transferência de Calor por Convecção em Estufas...
Baptista, F.J.; Navas, L.M.; Fitas da Cruz, V.; Meneses, J.F.; Relea, E.; Guimarães, A.C.A determinação dos coeficientes de transferência de calor por convecção é complexa devido ao elevado número de factores a considerar, tais como a natureza e posição da superfície e a natureza dos fluxos de energia (natureza da convecção, natural, forçada ou mista, e do tipo de fluxo, laminar ou turbulento). A análise pode ser simplificada utilizando os números adimensionais de Grashof (Gr), Reynolds (Re), Prand...
Comparion of humidity conditions in unheated tomato greenhouses with different ...
Baptista, Fátima J.; Bailey, B.J.; Meneses, J.F.The objective of the research was to investigate the influence of nocturnal ventilation on the humidity conditions in unheated tomato greenhouses and the consequences for Botrytis cinerea control. Experiments were carried out at the Instituto Superior de Agronomia in Lisbon in two identical adjacent double-span greenhouses covered with three layer co-extruded film. The climate was controlled by natural ventilat...
Nocturnal Ventilation For Controling Greenhouse Humidity and Botrytis Cinerea S...
Baptista, F.J.; Bailey, B.J.; Meneses, J.F.Grey mould disease is one of the most important diseases affecting crops grown in unheated greenhouses, where ventilation is the main technique used to control inside environmental conditions. The main goal of this investigation was to study the influence of nocturnal ventilation on the humidity conditions in unheated tomato greenhouses and the consequences for Botrytis cinerea control. Experimental work was re...
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