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Location of a Green House:

Factors to consider while locating green house;

a)      Sunlight direction: The greenhouse should be located where it gets maximum sunlight. The first choice of location is the south or southeast side of a building or shade trees. Sunlight all day is best, but morning sunlight on the east side is sufficient for plants. Morning sunlight is most desirable because it allows the plant’s food production process to begin early; thus growth is maximized. The next best sites are southwest and west of major structures, where plants receive sunlight later in the day. North of major structures is the least desirable location and is good only for plants that require little light.

b)       Light requirements of the plants to be grown;

c)      Shade: Evergreen trees that have foliage year round should not be located where they will shade the greenhouse because they will block the less intense sun.

d)     Drainage: Good drainage is another requirement for the site. When necessary, build the greenhouse above the surrounding ground so rainwater and irrigation water will drain away. Access to the greenhouse should be convenient for both people and utilities.

e)      A workplace for potting plants and a storage area for supplies should be nearby.

f)       Prevailing wind

g)      Topography of the area

Basic Structural component of a green house:

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Framing materials:

Greenhouses may be constructed from several different materials. Among the most popular are aluminum, steel and wood. Of these three, aluminum is by far the most economical and longest lasting.

Covering materials:

Greenhouse coverings include long-life glass, fiberglass, rigid double-wall plastics, and film plastics with 1- to 3-year lifespan. The type of frame and cover must be matched correctly.

Size

(1 Bank/Bay/Unit Dimensions:- ( 15 m x 7 m (or 50 ft x 23 ft)  =  105 m2 or 1150 ft2 ( minimum economic unit)

No. of Plants: -400-600 plants, depending on spacing.

Requirements:

(i) Polythene (Gauge 1000 Ultra Violet (U.V) treated).

  • Walls (sides) - 4m x 48m
  • Wider roof - 6m x 16m
  • Narrow roof - 5 m. x 16m.
  • gables - 6 m x 9m
  • Door shade - 4m X7m

(ii) Posts:

  • Side posts - 12 posts of 4m long
  • Mid posts - 6 posts of 5.5m

(iii) Rafters/timber

  • Trusses - 22 poles of 6m
  • Purlines - 9m x 6m
  • Wall plate - 30 x 6m
  • Wire supporters 6 x 6m
  • Side supporters 14 x 6m
  • Door shade posts 5 x 2.8m
  • Polythene fasteners 60 x 3m

(iv) Other requirements

  • Nails 30kgs
  • Smooth/barbed Wire- 1 roll
  • Hoop iron-10 kgs
  • black polythene sheet -65mx2m wide
  • Net 75 m x1m wide
  • Drip irrigation kit -1 drum kit
  • Crates-2
  • Nursery boxes/trays - (90×45x10) -2

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Inputs

(i) Labour - for construction, digging trenches, mixing planting medium, leveling and crop management

(ii) Seeds - 5gms (1000 seeds)

(iii) Fertilizers - 10kgs DAP, 10kgs    CAN and 10kgs CN for top dressing.                Foliar feed - 2 litres or 2kgs

(iv) Insecticides and fungicides

-  Insecticides - systemic (1 litre) and

- Contact (1 litre) at harvesting

Fungicides - Preventive (1kg) and

- Curative (1kg).

- Alternate preventive fungicides with curative fungicides for effective disease control and to avoid disease resistance.

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