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Definition, principles, importance and scope of protected cultivation of horticultural crops
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Introduction
Objectives of Protected Cultivation
Limitations of Protected Cultivation
Importance
Challenges in Protected Horticulture
Issues in Protected horticulture
Factors Affecting the Adoption of Protected Cultivation
Advantages and Constraints of Protected Horticulture
Principles of Protected cultivation/horticulture
Different growing structures for protected horticulture (glasshouse, naturally ventilated greenhouse, hi-tech and semi hi-tech structures, polyhouses, heating tunnel, screen house, rain shelters)
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Introduction
On the basis of environment control
On the basis of technology used
On the basis of structure/shape
Based on construction material
Based on utility or use
Other Structures
Based on soil and climate
Historical perspective and status of protected horticulture in Nepal and around the world
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History of greenhouse industry
Global status of greenhouse production
History of greenhouse technology in Nepal
Selection of site and designing of appropriate protected structures based on microclimate
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Selection of Site for Greenhouse
Basic Design Considerations of Greenhouse
Parts of greenhouse
Loads carried by protected structure
Types of Cladding Material in a Greenhouse
Properties of an Ideal Greenhouse Covering Material
Greenhouse covering material
Principles of protected farming and common practices of farming (soil based and soilless – hydroponics, substrate based, aeroponics and aquaponics)
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Principles of Protected Farming
Soilless culture
Sources of Nutrients in Soilless Culture
Sources of Macronutrients
Sources of Micronutrients
Organic and Alternative Sources
Reasons to Follow Soilless Culture
Types of Soilless Farming
Hydroponics
Advantages of Hydroponics
Disadvantages / Limitations of Hydroponics
Types of Hydroponics
Nutrient film technique (NFT)
Deep flow technique /Flood and drain
Drip-system/technique
Wick system/ technique (Capillary movement)
Root dip method
Floating method
Aeroponics
Principles of aeroponics
Aquaponics
Types of Aquaponics
Effect of different environmental and soil factors on crop growth in protected culture: temperature, humidity, soil moisture, air circulation, pH, electrical conductivity, solar radiation and light intensity.
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Introduction
Temperature
Light
Relative humidity
Ventilation
Carbon dioxide
Techniques to maintain optimal temperature inside greenhouse
Greenhouse cooling techniques
Greenhouse Heating Systems
CO2 enrichment
Humidity management
Dehumidification
How to dehumidify the greenhouse?
Controlling light levels
Soil Moisture Management inside greenhouse
pH Management inside Greenhouse
Electrical conductivity Management inside Greenhouse
Roofing structures, roofing materials and ventilation systems
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Introduction
Covering/roofing materials
Greenhouse covering materials
Ventilation Systems in Greenhouses
Micro irrigation technology, fertigation practices and soil management
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Introduction
Rules of Watering
Types/ Categories of Micro irrigation
Methods of irrigation under greenhouse condition
Master Protected and Precision Horticulture – Notes, Case Studies and Practical Insights – with Rahul

Based on construction material

a. Wooden/Bamboo greenhouse

  • In general, for greenhouses with span less than 6 m, only wooden framed structures are used.
  • Side posts and columns are constructed of wood without the use of a truss.
  • Pine wood is commonly used as it is inexpensive and possesses the required strength.
  • Timber locally available, with good strength, durability and machinability also can be used for the construction.

Bamboo Greenhouse – Our Farm by Earth Flora Inc.

b. Pipe-framed greenhouse

  • When the clear span is around 12 m, pipes are used for the construction of greenhouses.
  • In general, the side posts, columns, cross-ties and purlins are constructed using pipes.
  • Trusses are not used also in this type of greenhouse. The pipe components are not interconnected but depend on the attachment to the sash bars for support.

Modular Gi Pipes Greenhouse Structure at best price in Surat | ID: 2850139885573

c. Truss-framed greenhouse

  • If the greenhouse span is greater than or equal to 15 m, truss frames are used.
  • Flat steel, tubular steel or angle iron is welded together to form a truss encompassing rafters, chords and sturts.
  • Sturts are support members under compression and chords are support members under tension.
  • Angle iron purlins running throughout the length of greenhouse are bolted to each truss.
  • Columns are used only in very wide truss frame houses of 21.3 m or more. Most frames are best suited for pre-fabrication.

Truss Kit - Bootstrap Farmer

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