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Selection of Site for Green House/ Poly House

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Rural Technology

Any type of land could be used for green houses. The site should be away from industrial area to avoid pollution injury to plants. Shade of building or trees around polyhouses is also harmful. The site should be at reasonably at high level from the ground. Nearness to cities or probable markets is preferred. Sufficient water supply, labour availability, electricity supply are the other factors of prime importance. There should be a direct approach road.

Advantages of green house/ polyhouse technology

Let us study the advantages of green house/ poly house technology:

  1. Crops can be grown under adverse climatic conditions when it is not possible to grow them in open fields.
  2. Certain crops can be grown round the year in a particular place for continuous supply.
  3. Production of uniform quality crops.
  4. Productivity is 8 to 10 times higher than the crops grown in open fields.
  5. Management of insect pests, diseases and weeds is easier under these structures.
  6. These structures are ideally suited for small farmers and unemployed youth from rural areas.
  7. Organic farming is easier under these structures.
  8. Any type of land can be used for erection of these structures.
  9. Raising of nursery for developing seedlings of difficult to multiply plants.

Intext questions

Fill in the blanks:

  1. The site of the polyhouse should be reasonably at ————— from the ground level.
  2. The greenhouse structures are ideally suited for from rural areas.
  3. Raising of nursery for developing seedlings of plants.
  4. The site of polyhouse should be away from area to avoid pollution injury to plants.

Meaning:-

  1. Glass house: - Glass is used for covering roof and sides of a frame.
  2. Polyhouses: - Polythene sheet is used for convening the frame.
  3. Green house: - A structure in which the temperature is higher then out side because of CO2 trapped under the roof.
  4. Poly tunnel: - A tunnel like frame covered with polythene sheet.
  5. 5 Shade house: - A frame covered with shade nets to protect plants from direct sunlight (75% 60% or 50% shading effect)

What you have learnt

Green houses and Polyhouses are protected structures. These are useful for cultivation of certain crops in adverse climatic conditions. Different types of green houses and polyhouses are used in different region viz. frame type, lean to type, even span type etc. Crops grown in green houses are cherry tomato, capsicum, gerbera, rose, carnation, etc. In green houses and polyhouses productivity of crops is 8 to 10 times higher than the crops grown in open fields and management if pests, diseases and weeds is easier. These structures are suitable for small farmers and unemployed youth from rural areas.

Terminal questions

  1. Which points are considered in designing frame of green houses?
  2. Write the different materials used for covering roof of green houses.
  3. Explain the factors which are essential to be controlled in green houses.
  4. Write the advantages of green house / polyhouse technology.
  5. Enlist the different crops grown in green houses.

Answer to intext questions

10.1 1 climatic condition 2 Stagnate 3 UV stabilized 10.2 1 drag 2 by trapping natural 3 Relative humidity 10.3 1 high level 2 unemployed youth 3 difficult to multiply 4 industrial area

Suggested activity

Visit green houses which are growing different horticultural crops at different stages.

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