Recommended
More Related Content
What's hot
What's hot (20)
Similar to GREEN HOUSE AND EFFECT OF GREEN HOUSE ON NURSERY ESTABLISHMENT
Similar to GREEN HOUSE AND EFFECT OF GREEN HOUSE ON NURSERY ESTABLISHMENT (20)
More from Subroto Podder
Recently uploaded
Recently uploaded (20)
GREEN HOUSE AND EFFECT OF GREEN HOUSE ON NURSERY ESTABLISHMENT
- 2. PRESENTED BY SUBROTO KUMAR PODDER STUDENT ID : 120802
- 3. Presentation Title GREEN HOUSE AND EFFECT OF GREEN HOUSE ON NURSERY ESTABLISHMENT
- 4. Definition (Green house): Green houses are structure covered with a transparent material that allows sufficient sunlight to enter for the purpose of growing and maintaining plants.
- 5. Factor of Green house Types and sizes Greenhouses are built or manufactured in many different design types and sizes that depend upon the following: Available space Type of plants to be grown Geographical location Cost of construction materials
- 6. Fig:A nursery in a green house
- 7. Type of Green house : There are three type of Green house : 1. Attached greenhouse 2. Freestanding greenhouse 3. Connected greenhouse
- 8. 1. Attached Green house : Attached green house is connected to a building. Figure: Attached green house
- 9. Types of attached green house: There are two basic styles: A. Lean-to type greenhouse B. Attached even-span type greenhouse
- 10. A.Lean-to type greenhouse: Lean-to type houses consist of single span. This type is built on the south or east side of a wall suitable for growing of crops or on the north side of wall suitable for rooting of cutting
- 11. B.Attached even-span type green house: Even span houses of two spans and made along the north-south or east-west direction. Of the two types, the even span is more widely used.
- 12. 2.Freestanding green house: Freestanding green houses are separate from other buildings or green houses. It can provide good environmental condition . More land is needed for it . Figure: Freestanding green house
- 13. Types of Freestanding green house: Various types are as follows: Even span type Uneven span type Gothic arch type Quonset type
- 14. 3.Connected green house: • Connected green houses are joined together of several green houses. • This type of green houses need less construction material and less land. • It also require less heat and cost.
- 15. Figure: Connected green house •But It is difficult to accommodate different crops when they require different environmental conditions such as temperature, humidity and light.
- 16. Types of connected green house: Various styles include of it: Gutter-connected Dutch houses Barrel vault Saw tooth
- 17. Parts of a Green house: Foundation wall Side post Side glass bars Eave plate Roof glazing bars Columns Roof ventilation sash Ridge and ridge cap Gable glazing bars and sash Glass and Polyethylene etc. Protection measures in green house
- 18. Figure: Some parts of green house
- 19. Green house covering: 1.Glass: Advantage: • It provides the best light transmission of any greenhouse covering. Disadvantages: • Cost of glass is very high • Cost of heating the greenhouse is higher • Problems with vandalism
- 20. 2.Polyethylene: Advantages: The initial cost is cheaper Fuel costs are lower Disadvantages: Polyethylene has a short life span
- 21. Fig: Glass green house Fig: Polyethylene green house
- 22. Greenhouse Operation: A. Seedling Growth: Monitor outside and inside temperatures Repair any tears to plastic. Maintain interior surface temperature of 20°C- 25°C during germination phase. Maintain interior surface temperature of 20°C- 35°C during the rapid growth phase
- 23. Maintain interior surface temperature of <25°C during hardening phase. When outside temperature is above 20°C, slowly open sidewalls vents to increase wind exposure to help cool the plants. When interior surface temperature >35°C and greenhouse fully open, cover greenhouse with shade cloth or washable white paint
- 24. Figure: Seedling grow in green house
- 25. B. Regulate Interior Temperature: Open vent above door. Open side walls. Irrigate seedlings . White shade is more effective than other colors. Paint plastic with “whitewash” Regulate Interior Temperature.
- 26. Figure: Regulate Interior Temperature by opening sidewall
- 27. C. Watering •Keep soil moist. •Keep seed zone moist. •Irrigate with watering cans or sprinkler systems. •Make sure entire greenhouse is watered equally. •Measure irrigation volumes with simple cans. •Irrigate frequently to cool surface temperatures.
- 28. Fig: Watering cansFig: Sprinkler systems
- 29. D. Winter Maintenance: •Heavy snow loads can damage structure. •Structure can support 3-6 cm of snow cover. •Manually remove snow with broom. •Install interior heat source. •Can remove plastic.
- 30. Figure: Winter Maintenance in green house
- 31. E. Light control: A cover of black cloth gives just beneath the roof. Here control day length and light intensity. Many bulbs of various strength and radiation are used. The bulbs are controlled by automatic regulator.
- 32. Fig: Light control in green house
- 33. Criteria for Locating Greenhouse: Marketing Accessibility Climatic conditions Topography and drainage Water and other utilities Expansion Labour supply
- 34. Advantages of green house: It helps successfully germination of seeds. The development of strong roots from stem cuttings is a moist environment maintained at a favorable temperature. 24C is usually recommended for most plants to produce roots from stem cuttings, it can also be maintained by it It influences the physiological activity of plants.
- 35. It also maintains growth and development of most plants. Water loss is more dangerous for cuttings than seedlings , it can maintained by green house. It should not contain weeds, nematodes and other pathogens. Hydroponics, fog, mist and greenhouses are methods used in combination to propagate cuttings.
- 36. In a country, where snow falls down, plant can not live in low temperature . In this place , only green house can warm themselves. The availability of plant nutrients should be adequate. It contains sufficient pores for drainage of excessive water and to supply the rooting zone with adequate oxygen. It should be able to hold adequate moisture.
- 37. Root promoting hormones can be applied to the basal 1.2cm of cuttings to enhance root development of some plants. They are, A. Indole butyric acid (IBA) B. Napthalene acetic acid (NAA)
- 38. Disadvantage of green house: The main disadvantage to greenhouses is that they are extremely difficult to setup, as well as maintain. It is difficult to choice a location where the flowers and plants receive the correct amount of sunlight through the greenhouse. It is not easy to find a fertile land enough for growing plants.
- 39. Greenhouses are fairly expensive to construct. Glass allows direct sunlight to hit plants, which can be harmful during the summer time. It is very difficult to clear the dirty glass. people don't take care plastic greenhouse.
- 40. THANKS TO ALL