TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

Greenhouse plastics affect tomato pollination by influencing bee activity and bee loss through the ventilation systems. There is a significant difference in bee loss among plastic types ... . CT plastic, one of the less commonly used greenhouse plastics, experienced less bee loss than AT Duratherm, Patilux, and both AT Bee Poly and De Klerk together ... . The likely explanation for these results is that under CT plastic, bees are less able to visually detect the open vents because of the relatively small contrast between the transmitted light and the light through the vents. Our spectrophotometry results ... indicate that of the plastics tested, only CT plastic allows transmission of UV light. Because of this, fewer bees fly out of these greenhouses and die during the winter months.  1, fiche 1, Anglais, - greenhouse%20plastic

Record number: 1, Textual support number: 1 OBS

Greenhouse tomatoes and pollination by bumblebees. ... Bumble bee keeping in greenhouses has encountered some problems because of the escape of the bees ... through open vents in late winter and early spring. ... New understandings in insect colour vision (Backhaus 1993) have suggested ways by which the visual target of the open vents (daylight with UV) ... versus the greenhouse roof and walls (attenuated UV) can be disguised by coloured transparent flaps or blocked by screening so that the bees are not attracted and can not escape. The former would be easier and cheaper. UV light encourages the germination of spores of grey mould (Botrytis), so UV opaque plastics are favoured.  1, fiche 1, Anglais, - greenhouse%20plastic

Fiche 1,  Justifications,  Français

Record number: 1, Textual support number: 1 CONT

Plastique de serre : contribution des matériaux plastiques à la maîtrise du microclimat.  2, fiche 1, Français, - plastique%20de%20serre

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

"High tunnels can be used ... for gourmet or specialty crops, or for organic farming. You even can put small fruit trees such as figs inside the structures." Explained simply, high tunnels are single-car garage-size structures covered with clear plastic sheeting to manipulate soil and air temperatures using the energy of the sun. ... a series of growth trials [will be conducted] in 24 research high tunnels, which are 36 feet long, 17 feet wide and 9 feet high. ... Commercial-size versions of high tunnels, which are 96 feet long, also protect plants from insects, diseases and wind damage, virtually eliminating field loss ...  4, fiche 2, Anglais, - high%20tunnel

Record number: 2, Textual support number: 2 CONT

High tunnels are not conventional greenhouses. But like plastic-covered greenhouses, they are generally quonset-shaped, constructed of metal bows that are attached to metal posts which have been driven into the ground about two feet deep. They are covered with one layer of 6-mil greenhouse-grade polyethylene, and are ventilated by manually rolling up the sides each morning and rolling them down in early evening. There is no permanent heating system although it is advisable to have a standby portable propane unit to protect against unexpected below-freezing temperatures. There are no electrical connections. The only external connection is a water supply for trickle irrigation. The ends of the tunnels are framed in, and may be made portable (removable) to facilitate easy access into the tunnel with a small tractor and tiller.  5, fiche 2, Anglais, - high%20tunnel

Record number: 2, Textual support number: 3 CONT

Tunnel greenhouses. Tunnel with a great range of models depending on the widths, heights and distances between arches.  2, fiche 2, Anglais, - high%20tunnel

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 CONT

[Le] tunnel plastique [est une] enceinte réalisée à partir d'un film plastique souple, transparent à la lumière naturelle, permettant -- au moins temporairement -- de modifier l'environnement climatique de la culture pratiquée à son abri pour en améliorer la précocité ou en assurer la protection contre les basses températures (mais non contre le gel). Les dimensions peuvent en être très diverses : - tunnels bas, hauteur 0,5 mètre, largeurs 0,5 à 1,0 mètre, - abris-serres, hauteur 1,5 à 3,5 mètres, largeur 3 à 9 mètres.  3, fiche 2, Français, - abri%2Dserre

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Français

Fiche 3,  Justifications,  Espagnol