Results 251 to 260 of about 992,242 (297)

Research report on plastic greenhouses

2019
Objectives of this study are to develop improved construction methods for plastic greenhouses and to study plant growth rate and yield of vegetables when grown in glass vs plastic greenhouses.
Massey, P.H., McNeil, Marshall, Gray, R.W.   +2 more
openaire   +1 more source

Climate management for plastic greenhouses

1992
Compte rendu de débats sur la gestion du climat sous serres plastiques : lumière, luminosité, hygrométrie, température.
Feuilloley, P., Gratraud, J., Printz, P.
openaire   +1 more source

DETERMINATION OF THERMAL TRANSPARENCY OF PLASTICS MATERIAL FOR COVERING GREENHOUSES

Acta Horticulturae, 1990
La consommation thermique d'une serre pour son chauffage dépend essentiellement de sa couverture et de son comportement sous un climat extérieur donné. De nombreux films plastiques aux propriétés mal connues sont apparus sur le marché. Il devient alors nécessaire de caractériser les matériaux de couverture par un coefficient de déperdition, de déceler ...
Feuilloley, P., Guillaume, S., Issanchou, Gustave, Davenel, A.   +3 more
openaire   +2 more sources

WATER VAPOUR TRANSFERS AND DEHUMIDIFICATION IN A INFLATABLE PLASTIC GREENHOUSE

Acta Horticulturae, 1989
International ...
Boulard, Thierry, Baille, Alain, Lagier, Jacques, Mermier, M.   +3 more
openaire   +2 more sources

Natural ventilation of plastics tunnel greenhouses in the Mediterranean

1994
The use of plastics greenhouses is developing rapidly in the south of France. The local climate gives rise to a number of problems and particularly that of heating up during the summer. Good ventilation helps in the air circulation which is essential for the plants and reduces the wide temperature variations thereby increasing the length of time in the
Feuilloley, P., Mekikdjian, C., Lagier, Jacques   +2 more
openaire   +2 more sources

EFFECTS OF AGROCHEMICALS ON THE MECHANICAL PROPERTIES OF PLASTIC FILMS FOR GREENHOUSE COVERING

Acta Horticulturae, 2008
Greenhouse plastic films are subjected to degradation due to their exposure to solar radiation and to agrochemicals used during cultivation. This results in a reduction of life, which ranges from some months to 3–4 years relative to the thickness of the plastic film and to the degree of stabilisation. A research was carried out in order to evaluate the
G. VOX, E. SCHETTINI, L. STEFANI, MODESTI, MICHELE, UGEL, ELISABETTA   +4 more
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SOIL SOLARIZATION IN GREENHOUSE BY USING ECO-COMPATIBLE PLASTIC FILMS

Acta Horticulturae, 2006
Amongst the different eco-compatible techniques, the soil solarization using plastic films, in temperate regions and in greenhouses, represents one of the better alternatives to the use of methyl bromide in order to contain soil borne diseases. On the other hand, it must be noted that a high employment of plastic materials in agriculture causes the ...
CASTRONUOVO, Donato, CANDIDO, Vincenzo, MARGIOTTA, Salvatore, MANERA, Carlo, MICCOLIS, Vito, BASILE M.   +5 more
openaire   +3 more sources

A water-curtain heating system for plastic greenhouses

Journal of Agricultural Engineering Research, 1992
A possible alternative method of using power station waste heat has been investigated using a small-scale physical model and its performance compared with that predicted from thermodynamic principles. It employs a variation of the water-curtain surface-heating method first investigated experimentally by Canham in 1957.
J.F. Meneses, A.E. Canham
openaire   +1 more source

The Radiative Effectiveness of Plastic Films for Greenhouses

Journal of Applied Meteorology, 1963
Abstract The spectral transmission properties of glass, polyester film, polyvinyl-fluoride film, polystyrene film and polyethylene film are presented, based on laboratory determined spectrograms and field measurements of atmospheric infrared radiation.
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The plastic greenhouse industry of Spain

El artículo analiza la industria de invernaderos de plástico en España, destacando su expansión en las últimas décadas gracias a factores como la crisis energética de los 70 y el bajo coste de los materiales. Se describe la predominancia de invernaderos de tipo "parral" en el sureste español, las prácticas agrícolas empleadas (riego, cultivos sin suelo,
Castilla Prados, Nicolás, Hernández Rodríguez, Joaquín   +1 more
openaire   +1 more source