Greenhouse, Lath house, Net house, Hotbed

2. PRESENTED BY
SUBROTO KUMAR PODDER
STUDENT ID : 120802

3. Presentation Title
 GREEN HOUSE AND EFFECT OF GREEN
HOUSE ON NURSERY ESTABLISHMENT

4. Definition (Green house):
 Green houses are structure covered with a
transparent material that allows sufficient
sunlight to enter for the purpose of growing
and maintaining plants.

5. Factor of Green house Types and sizes
Greenhouses are built or manufactured in
many different design types and sizes that
depend upon the following:
 Available space
 Type of plants to be grown
 Geographical location
 Cost of construction materials

6. Fig:A nursery in a green house

7. Type of Green house :
There are three type of Green house :
1. Attached greenhouse
2. Freestanding greenhouse
3. Connected greenhouse

8. 1. Attached Green house :
Attached green house is connected to a building.
Figure: Attached green house

9. Types of attached green house:
There are two basic styles:
A. Lean-to type greenhouse
B. Attached even-span type greenhouse

10. A.Lean-to type greenhouse:
 Lean-to type houses consist of single span.
 This type is built on the south or east side of a
wall suitable for growing of crops or on the
north side of wall suitable for rooting of cutting

11. B.Attached even-span type green house:
 Even span houses of two spans and made along
the north-south or east-west direction.
 Of the two types, the even span is more widely
used.

12. 2.Freestanding green house:
Freestanding green houses are separate from
other buildings or green houses. It can provide
good environmental condition . More land is
needed for it .
Figure: Freestanding green house

13. Types of Freestanding green house:
Various types are as follows:
 Even span type
 Uneven span type
 Gothic arch type
 Quonset type

14. 3.Connected green house:
• Connected green houses are joined together of
several green houses.
• This type of green houses need less construction
material and less land.
• It also require less heat and cost.

15. Figure: Connected green house
•But It is difficult to accommodate different
crops when they require different
environmental conditions such as temperature,
humidity and light.

16. Types of connected green house:
Various styles include of it:
 Gutter-connected
 Dutch houses
 Barrel vault
 Saw tooth

17. Parts of a Green house:
 Foundation wall
 Side post
 Side glass bars
 Eave plate
 Roof glazing bars
 Columns
 Roof ventilation sash
 Ridge and ridge cap
 Gable glazing bars and sash
 Glass and Polyethylene etc.
 Protection measures in green house

18. Figure: Some parts of green house

19. Green house covering:
1.Glass:
Advantage:
• It provides the best light transmission of
any greenhouse covering.
Disadvantages:
• Cost of glass is very high
• Cost of heating the greenhouse is higher
• Problems with vandalism

20. 2.Polyethylene:
Advantages:
The initial cost is cheaper
Fuel costs are lower
Disadvantages:
Polyethylene has a short life span

21. Fig: Glass green house Fig: Polyethylene green house

22. Greenhouse Operation:
A. Seedling Growth:
 Monitor outside and inside temperatures
 Repair any tears to plastic.
 Maintain interior surface temperature of 20°C-
25°C during germination phase.
 Maintain interior surface temperature of 20°C-
35°C during the rapid growth phase

23.  Maintain interior surface temperature of <25°C
during hardening phase.
 When outside temperature is above 20°C,
slowly open sidewalls vents to increase wind
exposure to help cool the plants.
 When interior surface temperature >35°C and
greenhouse fully open, cover greenhouse with
shade cloth or washable white paint

24. Figure: Seedling grow in green house

25. B. Regulate Interior Temperature:
 Open vent above door.
 Open side walls.
 Irrigate seedlings .
 White shade is more effective than other
colors.
 Paint plastic with “whitewash”
Regulate Interior Temperature.

26. Figure: Regulate Interior Temperature by
opening sidewall

27. C. Watering
•Keep soil moist.
•Keep seed zone moist.
•Irrigate with watering cans or sprinkler
systems.
•Make sure entire greenhouse is watered
equally.
•Measure irrigation volumes with simple
cans.
•Irrigate frequently to cool surface
temperatures.

28. Fig: Watering cansFig: Sprinkler systems

29. D. Winter Maintenance:
•Heavy snow loads can damage structure.
•Structure can support 3-6 cm of snow cover.
•Manually remove snow with broom.
•Install interior heat source.
•Can remove plastic.

30. Figure: Winter Maintenance in green house

31. E. Light control:
 A cover of black cloth gives just beneath the
roof.
 Here control day length and light intensity.
 Many bulbs of various strength and radiation
are used.
 The bulbs are controlled by automatic
regulator.

32. Fig: Light control in green house

33. Criteria for Locating Greenhouse:
 Marketing
 Accessibility
 Climatic conditions
 Topography and drainage
 Water and other utilities
 Expansion
 Labour supply

34. Advantages of green house:
 It helps successfully germination of seeds.
 The development of strong roots from stem
cuttings is a moist environment maintained at a
favorable temperature.
 24C is usually recommended for most plants
to produce roots from stem cuttings, it can also
be maintained by it
 It influences the physiological activity of
plants.

35.  It also maintains growth and development of
most plants.
 Water loss is more dangerous for cuttings than
seedlings , it can maintained by green house.
 It should not contain weeds, nematodes and
other pathogens.
 Hydroponics, fog, mist and greenhouses are
methods used in combination to propagate
cuttings.

36.  In a country, where snow falls down, plant can
not live in low temperature . In this place , only
green house can warm themselves.
 The availability of plant nutrients should be
adequate.
 It contains sufficient pores for drainage of
excessive water and to supply the rooting zone
with adequate oxygen.
 It should be able to hold adequate moisture.

37.  Root promoting hormones can be applied to the
basal 1.2cm of cuttings to enhance root
development of some plants. They are,
A. Indole butyric acid (IBA)
B. Napthalene acetic acid (NAA)

38. Disadvantage of green house:
 The main disadvantage to greenhouses is that
they are extremely difficult to setup, as well as
maintain.
 It is difficult to choice a location where the
flowers and plants receive the correct amount
of sunlight through the greenhouse.
 It is not easy to find a fertile land enough for
growing plants.

39.  Greenhouses are fairly expensive to
construct.
 Glass allows direct sunlight to hit plants,
which can be harmful during the summer
time.
 It is very difficult to clear the dirty glass.
 people don't take care plastic greenhouse.

40. THANKS TO ALL