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Green house

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Green house

  1. 1. Presentation on Greenhouse and different type of structures Design and development of low cost greenhouse structures Sukhdeep Singh MSc Fruit Science 97273
  2. 2. What is Green House A greenhouse is a structure with walls and roof made chiefly of transparent material, such as glass, in which plants requiring regulated climatic conditions are grown. OR “A greenhouse is a framed or an inflated structure covered with a transparent material which permits at least partial control of plant environment and which are large enough to permit a person to carry out cultural operations” (Chandra and Panwar 1987 ). The purpose of growing crops under greenhouse conditions is to extend their cropping season and to protect them from adverse environmental conditions, such as extreme temperatures and precipitation, and from diseases and pests (Hanan et al. 1978 ).
  3. 3. Types of Structures Styles of greenhouses vary widely. How they are built and what they are built with is often the result of factors such as budget, material availability, area of the country, crops to be grown and long term use. These are following:-  Lean-to type  Even span  Ridge and furrow  Quonset Greenhouse  Barrel Vault Greenhouse  Dutch Venlo Greenhouse ( Von Elsner et al., 2000)
  4. 4. Lean to Greenhouse A lean to greenhouse is attached to a home or building allowing for easier access to utilities including electricity and water supply. One advantage of a lean to greenhouse is that it is in close proximity to your house and allows for better monitoring of your plants. A disadvantage of a lean to greenhouse is that sunlight entrance is limited.
  5. 5. Even Span Greenhouse The even span greenhouse has even pitched sides similar to that of a house. An advantage of the even span greenhouse is that they are most common and have even spacing. A disadvantage of even span greenhouses is that they have overlapping panes which increases the chance of leakage.
  6. 6. Ridge and Furrow Greenhouse The ridge and furrow greenhouse is a jointed community of even span greenhouses. This design allows for an increase of space and sunlight. A disadvantage of the ridge and furrow greenhouse would be that if water was not correctly drained, damage could be caused. Also, shadows from gutters could prohibit sunlight.
  7. 7. Quonset Greenhouse A quonset greenhouse is dome shaped and provides optimal sun entrance.Quonset greenhouses have ventilation systems, heating systems, circulation fans, and better environmental control. An advantage of the quonset greenhouse is that they work well on hillsides and maximizes heating from the sun. A disadvantage of the quonset greenhouse is that they are expensive require more support because of the uneven structure.
  8. 8. Barrel Vault Greenhouse The barrel vault greenhouse consists of several quonset type greenhouses connected through gutters. An advantage is that they can be built with a ridge vent which provides air circulation throughout. A disadvantage would be that they are difficult to maintain.
  9. 9. Dutch Venlo Greenhouse The dutch venlo greenhouse is modification of the ridge and furrow greenhouse. High winter sunlight is reached easily to grow certain crops. A disadvantage of the Dutch Venlo greenhouse is that the highly ventilated windows can allow cold air to enter the greenhouse.
  10. 10. Types of Greenhouses Glasshouse
  11. 11. Glass House:- As its name indicates, glass is used as glazing material in this greenhouse. Perhaps this is the first and oldest among all types of greenhouse structures. Glass panels are fitted with the help of a wooden or metal frame. It can be of any shape and size and it is pretty effective for winter cultivation, but due to increase in day temperature in summer, it becomes unfit for cultivation during summer. High initial cost, difficulty in construction, and frequent damage of glass panels by strong winds are other discouraging factors. In hilly regions, only a few of such structures are found for research
  12. 12. Net House Net house is a framed structure made of materials such as GI pipes, angle iron, wood or bamboo. It is covered with plastics net (Nets are made of 100% Polyethylene thread with specialised UV treatment) having different shade percentages. It provides partially controlled atmosphere and environment by reducing light intensity and effective heat during day time to crops grown under it. Hence round the year seasonal and off-season cultivation is possible. Nets are available in different shade percentages or shade factor i.e 15%, 35%, 40%, 50% 75% and 90% (for example 35% shade factor means - the net will cut 35% of light intensity and would allow only 65% of light intensity to pass through the net). D.T. Santosh*, K.N. Tiwari
  13. 13. Advantages of Nethouse • Helps in cultivation of flower plants, foliage plants, medicinal plants, vegetables and spices. • Used for fruit and vegetable nurseries as well as for raising of forest species etc. • Used to protect against pest attack. • Protects from natural weather disturbances such as wind, rain, hail and frost. • Used in production of graft saplings and reducing its mortality during hot summer days. • Used for hardening tissue culture plant lets
  14. 14. Application of Nethouse • Nursery propagation, floriculture, indoor plants, vegetables, tea, coffee, spices. • Hardening of plants. • Cattle shed, Fish Pond, Poultry Farming etc • Drying of various Agro products • Acts as a wind breaker • Greenhouse, terrace gardening & fencing • Used as safety nets for building repairs & constructions • Vermi compost unit
  15. 15. Polytunnel • A polytunnel (also known as a polyhouse, hoop greenhouse or hoophouse, grow tunnel or high tunnel) is a tunnel typically made from z35 Steel and covered in polythene usually semi- circular, square or elongated in shape. The interior heats up because incoming solar radiation from the sun warms plants, soil, and other things inside the building faster than heat can escape the structure. • Temperature, humidity and ventilation can be controlled by equipment fixed in the polytunnel or by manual opening and closing of vents. Bhattacharyya, Pramit (May 17, 2012).
  16. 16. Polytunnel
  17. 17. Uses • Polytunnels can be used to provide a higher temperature and/or humidity than that which is available in the environment but can also protect crops from intense heat, bright sunlight, winds, hailstones, and cold waves. This allows fruits and vegetables to be grown at times usually considered off season; market gardeners commonly use polytunnels for season extension. • Beyond season extension, polytunnels are also used to allow cold-hardy crops to overwinter in regions where their hardiness isn't quite strong enough for them to survive outdoors.
  18. 18. DESIGN AND DEVELOPMENT OF LOW COST GREENHOUSE The greenhouse is now better understood as a system of controlled environment agriculture (CEA), with a precise control of air, temperature, humidity, light, carbon dioxide, water and plant nutrition (Tiwari, G. N., 2003) The main purpose of greenhouse technology is to provide a good growing environment for successfully growing high quality plants round the year. The growing of fruits, flowers and vegetables under greenhouse is common practice. Ref:- G. RAJENDER, K. SUSHANTH, K. MITHUN, B. DEVENDER, D. RAJU & K. ANOOSHA
  19. 19. Overall Dimensions of Low Cost Greenhouse of Area 50 m2 Length of greenhouse 10m Width of greenhouse 5m Distance between Side poles 2.5m Distance between centre poles 2.5m Depth of foundation 0.6 m Height up to gutter 2.0 m Height up to top 3.5 m Top ventilation 0.5 m Side ventilation 0.5 m The length of line joining between left side pole to central pole 2.7 m The length of line joining between right side pole to central pole 2.91 m
  20. 20. MATERIALS REQUIRED The following materials are required to construct the low cost greenhouse Wooden Posts:- The wooden posts of instance casuarina wood were used. These wooden posts are used for main structure like side posts and central posts. The height of the side posts and central posts would be 3 m and 4.2 m long respectively. A proper selection of these posts will help in maintaining symmetry of the structure. Bamboos:- Usually a light weight, small diameter bamboos were used.The average diameter of bamboo taken was 6.2 cm. The length of bamboos used was 5.5 m. These bamboos were generally used for making the frame of the green house.
  22. 22. BAMBOOS
  23. 23. Cladding Material UV stabilized 200-micron polyethylene of size 140 square meters are used for 50 square meters of floor area. Size of cladding material will depend upon side areas and frame area of the greenhouse. · Insect Proof Net Insect proof net was used to prevent the entry of insects into the greenhouse. The net was covered along the side and top ventilations. Size of the insect proof net will be 15 square meters for 50 square meters of floor area which is equivalent to ventilation area.
  26. 26. Frame Work
  27. 27. THANKS