Naturally Ventilated Polyhouse Technology

Introduction

This is a special structure made of G.I. pipes, insect proof nets and transparent plastic sheets, which protect the crops from adverse climatic conditions, insect-pests and different viruses. In this type of polyhouse all four sides of the greenhouse are covered with an insect-proof, 40 mesh nylon net. Rollable plastic curtains from the ground are used to cover sides. During summer, this plastic curtain is rolled up and down in winter for proper cross ventilation with the help of a pipe.

The roof is covered with 200 micron thick, transparent polythene film. An insect-proof nylon net is also used in place of roof ventilators for natural air flow and insect free ventilation. This kind of polyhouse does not require electricity. For irrigation, low pressure drip irrigation system is used. This type of structure is suitable for peri-urban areas where high value vegetables like tomato, capsicum, parthenocarpic cucumber etc. and flowers like rose, chrysanthemum and gerbera can be grown easily.

Optimum size and cost of construction of polyhouse:

•  Optimum size: 1000 m2

•  Expected cost of fabrication: 10-12 lakhs

•  Design of structure: Saw-tooth or multi-span

•  Irrigation system: Drum kit or low pressure drip system

For further information please contact :

Indian Agricultural Research Institute,
New Delhi,
Delhi 110012