Paper 2/16 Flashcards
Greenhouse
Distinct benefits
Increased control of environmental factors e.g.irrigation, supplementary lighting, temperature, humidity.
Increased yields.
Extended season of cropping.
Propagation of tender plants.
Polythene tunnel.
Distinct benefits.
Potential for all year round cropping.
More even growth.
Cold frame
Distinct benefits
Hardening off of young plants.
Rooting takes place more quickly when propagating plants from hardwood cuttings.
Conservatory.
Distinct benefits.
Suitable environment to display groups of plants e.g. Orchids
Higher night time temperatures depending on heating system.
Four distinct cladding materials.
Horticultural glass, polythene sheeting, acrylic, shade netting, twin walled polycarbonate.
Horticultural glass.
Description.
Good natural light transmission.
Stable material, effective over a long period of time.
Retains long wave radiation so warms up when exposed to direct sunlight.
Heavy, fragile, difficult to handle and not easy to cut.
Twin walled polycarbonate.
Description.
Light in weight. Does not bend. Easy to work with, can be cut and sawn. Excellent heat retention. Good light transmission properties but deteriorates over time.
Natural Ventilation
Cool air enters the glasshouse at low level via louvres, ventilators or an open door and leaves the structure through the roof ventilators after being heated by radiation within the glasshouse.
Forced Draught/Fan Vetelation.
Cool air enters the glasshouse via louvres or ventilators in the side of the glasshouse and the hot humid air is forced out by the use of extractor fans situated on the other side of the structure.
Reducing temperature within a protected structure.
Damping Down - water, applied to plants or paths within a protected structure to assist cooling process. As the water evaporates it removes the latent heat from within the structure.
Water can be applied by irrigation system, hose pipe using a lance and rose.
Shading - applied to the outside of glasshouse structure in the form of paint or shading laths. Netting or thermal screen can be used inside the structure.
Terracotta containers.
Properties and suitability for interior display.
Porous - allows moisture to evaporate from sides. Heavy in weight. Suitable for interior display. Available in range of sizes and shapes. Aesthetically pleasing.
Plastic containers.
Properties and suitability for interior display.
Impervious to water, make growing media more moisture retentive.
Long lasting.
Suitable for interior display.
Available in range of colours and can be designed to imitate other materials.
Natural stone.
Properties and suitability for interior display.
Heavy to lift and move.
Only available in limited number of shapes.
Suitable for interior display as it is durable but only available in a limited range of colour shades.
Forcing Narcissus ‘Tête-à-tête ‘
Plant bulbs at the end of September.
Plant in containers without drainage holes.
Use bulb fibre - bulbs should be half out of growing media.
Place container in cold, moist environment at temp around 4 degrees C. For 13 weeks to encourage root production.
Container is then placed in a well lit, warm environment at a temp. of 16 degrees for four weeks before the bulbs will flower.
Daffodil Basal Rot
Bulb slightly soft and brown, spreading rot develops.
On bulbs in store a pinkish white fungus may be visible between scales and basal plate.
Eventually bulb rot completely and look mummified.
Affected bulbs which are planted may not flower and leaves yellow.
Neck if bulb may also be affected.
Control - grow resistant cultivars eg. Narcissus tazetta, do not store damaged or soft bulbs, do not plant Narcissus where infection has occurred before.
