The case of a poly-house in Bangalore 

Poly houses too can harvest rainwater and if used through a drip irrigation mechanism much water requirement of the poly house can come from rainwater

Karnataka State

  • Has the 2nd largest drought prone area in India
  • 20 of 26 districts are drought prone
  • Average rainfall is 600 mm
  • The search is for water and food security
  • Bore wells are now 400 metres deep in parts of the state
  • Only 35% of the state is irrigated

Poly house

  • Area 175 sq mt.
  • Shade netting
  • Plant spacing 30 x 60cm
  • Number of plants 700
  • Duration of crop 6 months
  • Yield 486 kgs
  • Price Rs 35 / kg.
  • Total value
  • Rs 17,014/-

Drip irrigation system

  • Water demand
  • 1000 litres per week
  • 1.45 litres per plant per week
  • Drip rate 2 litres/hour
  • Total water demand
  • per crop 30000 litres

Research results

  • Rooftop rainwater incident on poly house
  • 161,525 litres
  • Annual water demand 60,000 litres
  • Rainwater collection efficiency 87 %
  • Storage requirement 5000 litres for one crop
  • 15,000 litres for 2 crops

Future work

  • Minimizing cost of poly house
  • Multi cropping
  • Techno economic feasibility for many crops
  • Research results are preliminary only

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