Green House Cultivation

 

Importance of green house

In conventional cultivation, the crops are being grown in the open field under natural conditions.  Here the crops are susceptible to sudden changes in climate and their yield is also affected. Protected cultivation is a cropping technique wherein the micro climate surrounding the plant body is controlled partially/ fully as per the requirement of the plant species. As a result the yield is enhanced and stabilized.

Principle of green house The green house is generally covered by transparent or translucent material such as glass or plastic. The green house covered with simple plastic sheet is termed as poly house. The green house generally reflects back 43% of the net solar radiation incident upon it. At the same time it allow the transmittance of the "photo synthetically active solar radiation" in the range of 400-700 Nm wave length.
Use of green house
  • Production of vegetable crops.
  • Production of off-season flowers, vegetables.
  • Production of Roses, Carnation, cut-flowers etc.
  • Plant propagation, raising of seedlings.
  • Primary and secondary hardening nursery of Tissue cultured plant.
  • Growth / Production of rare plants, orchids / herbs, medicinal plants.
Components of a green house
  • Green House G.I. structure.
  • Covering material-UV stabilized Polyethylene / Polycarbonate / Acrylic.
  • Root Ventilation & Side wall roll up curtains.
  • Cooling pad and Fan System.
  • Shading / Thermal net Manually / motorized.
  • Micro Irrigation System.
  • Fertigation System
  • Misting System.
  • Heating System.
  • CO2 Generator.
  • Control System - Manual / Semi Automatic / Automatic. Fully Computerized / Weather Station.
  • Planting material, soil media.
Benefits of green house
  • Environment control allows raising plants anywhere in the world at any time of the year i.e. crops could be grown under the inclement climatic conditions when it would not be otherwise possible to grow crops under the open field conditions.
  • The crop yields are at the maximum level per unit area, per unit volume and per unit input basis.
  • The control of the microcosm allows the production of higher quality products which are free from insect attack, pathogens and chemical residue.
  • High value and high quality crops could be grown for export markets.
  • Income from the small and the marginal land holdings maintained by the farmer can be increased by producing crops meant for the export markets.
  • It can be used to generate self employment for the educated rural youth in the farm sector.
References http://planning.up.nic.in/innovations/inno3/ph/ployhouse.htm