Greenhouse watering/overwintering/heating etc

Question 1

How can you add fertiliser to plants in a greenhouse?

Answer 1

via the irrigation water
or, add into compost

Question 2

What form is the fertiliser in that is added to water?

Answer 2

a crystal that dissolves easily or liquid concentrate that is diluted prior to use.

An organic fert. is seaweed

Question 3

Name some plants that are overwintered in a greenhouse

Answer 3

Fuchsia
Aloe
Geraniums
rooted cuttings of shrubs

Question 4

Name some methods of heating a greenhouse

Answer 4

pipes with hot water
pipes with steam - commercial scale
paraffin heaters - domestic & protects from frost

Warm air circulated via fans or polythene duct tubes
Electric heaters

Question 5

What is the negative effect on plant growth with poor ventilation in a greenhouse?

Answer 5

The GH tends to sweat - the moisture level in the air has built up too high and the crop becomes vulnerable to fungal disease.

Question 6

how can you reduce humidity without using ventilation?

Answer 6

raise the air temp
install a humidifier

Question 7

how does a humidifier work?

Answer 7

£££ to operate

Can remove several gallons of water from the air during a night

Question 8

what plants would benefit from a humidifier in a GH?

Answer 8

Geraniums - it needs to be kept frost free in midwinter and very dry with minimal moisture in the air

Question 9

what diseases are geraniums prone to midwinter due to high humidity?

Answer 9

rust fungus
Botrytis

Question 10

label the parts of a humidifier

Answer 10

Mobile unit
refrigerator coils
outlet of dried air
drip tray
outlet for water
air intake
fan