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Poly house

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Mindmap.pngConcept Map

Archerytarget.pngObjectives

This OER enables you to

  • explain advantages of greenhouse farming
  • identify the types of greenhouse used in India

Writing.pngIntroduction

Tools.gifActivity

Do It Yourself

Make 3 small raised beds of 0.5*0.5 M size with fine soil and vermicompost mixture (1:1 proportion). Plant 100 gm of coriander seed in each bed and water it. Now out of these 3 beds, keep 1st bed open to sun light and water it on daily basis (note amount of water applied / daily) , then cover 2nd bed with normal plastic paper in semi circular form with the help of bamboo sticks/ iron rods ( as shown in photo). Then cover 3rd bed with polyhouse paper (UV stabilize paper) as you made for bed 2nd. Note amount of water applied to each bed / daily and plant growth for next 20 days. [Supportive PPT link of ARTI humid chamber technique] {Expected results - Bed no 3 will show highest plant growth because of polyhouse effect whereas , bed no 2 show little less growth of plant because of no uv stabilization effect and in bed no 1 lowest plant height will be recorded.}

Brief History of greenhouse and advantages of greenhouse farming

The idea of growing plants in environmentally controlled areas has existed since Roman times. The Roman emperor Tiberius ate a cucumber-like vegetable daily. The Roman gardeners used artificial methods (similar to the greenhouse system) of growing to have it available for his table every day of the year. Then the first modern greenhouses were built in Italy in the 13th century to house the exotic plants that explorers brought back from the tropics. The French botanist Charles Lucien Bonaparte is often credited with building the first practical modern greenhouse in Leiden, Holland to grow medicinal tropical plants. Greenhouse structures adapted in the 1960s, when wider sheets of polyethylene film became widely available. In India Greenhouse constructed started around 20-25 years backs with growing demand of exotic flowers and vegetables. In India except Kashmir , Himachal Pradesh like states we don’t receive much snow fall like that of European / American countries, (so we don’t need heating system for greenhouses ) but still this technique is useful for growing number of Indian and exotic crops. Following are the main advantages of greenhouse farming, as given below-

Advantages of Greenhouse / polyhouse farming

1 Crops can be grown under adverse climatic conditions when it is not possible to grow them in open field.
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 Rising of nursery for developing seedlings of difficult to multiply plants.
10 Precise irrigation and fertilization is possible.
11 Export oriented production is possible under these structures.

Tools.gifActivity

Identify different greenhouses as per their covering material used from following three photos –

From above photos, identify which is the glasshouse / polyhouse and shednet house.

The material used for covering roof
1 Glass
2 Plastic
A) Sheet Plastic:-Polyethylene, Polyvinyl chloride, Polyester, Polyvinyl Florida
B) Rigid Plastic:-Polyvinyl chloride, fiber glass reinforced Plastic, Acrylic, Poly carbonate. Most widely used U.V stabilized polyethylene film of 200 micron thickness
Let’s see now which are the different types of greenhouse (classification as per structure design)-

Type of green houses

1 A frame type
2 Lean to type
3 Even span type
4 Gothic Arch
5 Connect with gutter system
6 Geodesic home

Let see now, what are the important criteria in selecting site and other climatic factors in polyhouse- Any type of land could be used for green houses, but following are the important points should br taken into consideration while selecting site for polyhouse as –

• 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.

Giftbox.pngSummary

let’s see what we have learnt –

  • Green houses and polyhouses are protected structures useful for cultivation of certain crops for enhances production and quality.
  • Basic concept of greenhouse technique is enhancing photosynthesis in plants with increase CO2 level.
  • Different types of green houses and polyhouses are used in different region viz. frame type, lean to type, even span type etc.
  • Site selection for polyhouse is important factor while building poluhouse.

Inkpot.png Assignments

Discuss on the following issues:

  • How greenhouse works and advantages of greenhouse.
  • Which are the different types of Greenhouse?