RHS R2114 Outcome - 3

Question 1

List the characteristics of materials used in framework construction - Steel
Include benefits and limitations

Answer 1

Steel - Weight, strength, reduction of light transmission , aethetics and cost compared to other materials. Longevity

Question 2

List the characteristics of materials used in framework construction - Aluminium
Include benefits and limitations

Answer 2

Weight, strength, reduction of light transmission , aethetics and cost compared to other materials. Longevity

Question 3

List the characteristics of materials used in framework construction - Wood
Include benefits and limitations

Answer 3

Weight, strength, reduction of light transmission , aethetics and cost compared to other materials. Longevity

Question 4

List the characteristics of materials used in framework construction - Plastics
Include benefits and limitations

Answer 4

Weight, strength, reduction of light transmission , aethetics and cost compared to other materials. Longevity

Question 5

Describe the properties of cladding materials - Glass.
Include benefits and limitations

Answer 5

Lifespan
light transmission
surface abrasion
strength
weight
saftey
relative cost to other cladding

Question 6

Describe the properties of cladding materials - Polythene film.
Include benefits and limitations

Answer 6

Lifespan
light transmission
surface abrasion
strength
weight
saftey
relative cost to other cladding

Question 7

Describe the properties of cladding materials - Polycarbonate.
Include benefits and limitations

Answer 7

Lifespan
light transmission
surface abrasion
strength
weight
saftey
relative cost to other cladding

Question 8

Describe the properties of cladding materials - Acrylic sheet.
Include benefits and limitations

Answer 8

Lifespan
light transmission
surface abrasion
strength
weight
saftey
relative cost to other cladding

Question 9

Describe the properties of cladding materials - Shade netting.
Include benefits and limitations

Answer 9

Lifespan
light transmission
surface abrasion
strength
weight
saftey
relative cost to other cladding

Question 10

Describe the properties of cladding materials - Fleece.
Include benefits and limitations

Answer 10

Lifespan
light transmission
surface abrasion
strength
weight
saftey
relative cost to other cladding

Question 11

What affects the levels of light in protected structure

Answer 11

Shape of strucutre- venlo, widespan, Mansard, curvilliner.
Angle of incedence. Aesthetics
Site factors - Exposed /sheltered, latitude
Orientation - E-W or N-S
Cladding condition - new, scratched, dirty, screened/painted with shading compound.

Question 12

How can temperature be maintained in structure

Answer 12

Heating - Gas, Oil, Electric heater
Circulating water and air
Cooling by forced or natural ventilation
Evaporation
Shading
(Including costing, reliability, practicality)

Question 13

What is meant by ‘Damping down’

Question 14

What methods can be used to change Relative Humidity (RH) in protected environment

Answer 14

1. Damping Down
2. Ventilation - add paterns of ventilation
3. Temperature change - add effect to RH and in turn wter and nutrient uptake

Question 15

Describe manual and automated irrigation methods, the benefits and limitaions.

Answer 15

1. Watering can
2. Hose pipes
3. Capillary systems
4. Drip systems

Question 16

How can light levels be manipulated - state what each method does

Answer 16

1. Supplementary lights - extend growing season
2. Blinds - avoid over heating
3. Shading paints - avoid over heating

Supplementary comment - artificial light / dark periods used to prepare Poinsettia crops

Question 17

Describe importance of cultural and biological controls to limit plant pests and diseases.
Give two examples how biological controls are used for specific pest
Include the benefits of cultural and biological over the use of Chemical

Answer 17

Biological controls -
nematodes - snail/slug
mite
wasp
ladybird (aphid)

benefits of cultural and biological over the use of Chemical removes the risk issue when producing food crops.