Farm Structures - Agriculture Form 3 Notes

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  • Farm structures are physical constructions on the farm used to increase efficiency in production.

Construction of Farm Structures

- Involves:

Planning for Farm Structures


  • Farm activities.
  • Size of the enterprise.
  • Future of the enterprise.
  • Accessibility.
  • Soil type.

Siting Farm Structures


  • The location of the homestead.
  • Accessibility.
  • Security.
  • Drainage/topography.
  • Wind direction.
  • Relationship between the structures.
  • Proximity to social amenities.
  • Farmer's taste and preference.

Materials for Construction

Structural Materials and Use

Factors which determine the type of materials to use are;

  • durability,
  • strength,
  • labour,
  • availability,
  • workability,
  • serviceability,
  • cost
  • sanitation

Stones and Bricks


  • Stones and bricks are durable, easy to disinfect, resistant to weather and insects decay and are easily available.


  • They are bulky and require skilled labour to make them.

Plastic and Synthetic Materials

These include;

  • glass,
  • asbestos fibre
  • polythene materials.


  • Light,
  • cheep depending on quality,
  • easy to disinfect,
  • can be moulded into any shape,
  • are durable,
  • cannot be destroyed by insects and fungus
  • are water-proof.


  • Are easily destroyed,
  • fragile,
  • very expensive
  • require skilled labour.

Wood (Timber)


  • They are workable,
  • cheap,
  • can be re-used
  • are fairly strong.



  • They can catch fire easily,
  • decay if exposed to water
  • are affected by fungus and insects.


  • Is a mixture of cement, sand, aggregate and water
  • e.g. in making blocks the ratio is 1:2:3; one part cement, two parts sand and three parts aggregate.


  • Making posts for fencing.
  • Making walls and floor of buildings.
  • Making gabions and water channels to prevent erosion.
  • Making water troughs.


- These materials are;

  • durable, workable,
  • easy to disinfect,
  • cheap to maintain,
  • fire resistant


- These materials are ;

  • expensive,
  • require skilled labour,
  • bulky,
  • cannot be reused

Animal Handling Structures

  • The crush –used when doing following activities;
    • Spraying livestock to control ticks,
    • milking,
    • examining sick animals,
    • artificial insemination,
    • treating animals, eg drenching, vaccination,
    • doing routine jobs such as dehorning, identification marks,
  • The spray race-used in the control of ticks by spraying livestock with acaricides
  • The dip- machakos type, and the pludge dip. This is used in the control of ticks by dipping livestock

Farm Buildings

Factors to be Considered in Site Selection

  • Security
  • Nearness to a source of water
  • Topography
  • Direction of the prevailing wind
  • Direction of the sun
  • Personal whims/tastes and preference
  • Nearness to means of communication.

Types of Farm Buildings

  • Houses for farm animals.
  • Stores for farm produce.
  • Stores for equipment, tools and supplies.
  • Buildings for growing crops e.g green house.
  • Building for processing plant e.g milk plant.

Parts of a Building

  • The foundation,
  • The walls,
  • The roof

Parts of a Roof

parts of a roof.PNG


  • kingpost,
  • rafters,
  • struts,
  • tie beam,
  • rafter batten

Parts of a Wall

parts of a wall.PNG

 Parts of the Foundation

parts of the foundation.PNG


  • concrete floor,
  • foundation wall,
  • PVC sheet (damp-proof course)
  • the compacted fill (hard core).


Importance of Fence in a Farm

  • Keep out intruders to the farm,
  • Define the boundary lines of the farm.
  • Paddocking of fields to make rotational grazing possible.
  • Live fences serve as windbreaks.
  • Fences are used in mixed farming to protect crops from. damage by livestock.
  • Fences add aesthetic values to the farm.
  • It is easy to control breeding.
  • It is easy to isolate sick animals from the rest of the herd.

Types of Fences

  • Dead fences.
  • Barbed wire fences.
  • Electric fence.
  • Concrete fence.
  • Chicken wire fence (mesh wire fence).
  • Woven wire fence (chain link).
  • Wooden fence.

Fencing Practice

- Materials include;

  • wires,
  • staples,
  • nails,
  • posts,
  • droppers
  • concrete materials.

Size of posts:

  • General purpose 2.5m by 25cm in diameter
  • Strainer units and corner posts 3m by 30cm in diameter:

Distance between the posts:

  • 3m between posts, 10m if droppers are to be used.
  • 200m between strainer units.

Depth of holes - 60cm.

Gate Posts, Gates and Strainer Units

  • Gates should be hung on posts separate from the fence.
  • Mechanical implements for example tractors require 4.0-4.5m width of gate.
  • Entrance gates for pedestrians can be accommodated within the fence.

Steps in Fencing

  • Locate the corners
  • Clear the fencing area.
  • Mark gates, strainers, pass places and standards by pegging.
  • Dig holes to proper depths.
  • Fix the standard posts.
  • Firm around posts or apply concrete.
  • Fix wires on posts.
  • Fix the droppers.
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