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FORM IFORM IIFORM IIIFORM IVQUIZ

KENYA CERTIFICATE OF SECONDARY EDUCATION

FORM III - AGRICULTURE SYLLABUS

Click here to View Agriculture Syllabus in PDF

21.0.0 SOIL AND WATER CONSERVATION (19 LESSONS)

21.1.0 Specific Objectives

21.2.1 Soil erosion

  • Definition

  • Factors influencing erosion

   - Land use and ground cover

   - Topography - gradient and length of slope (horizontal and vertical intervals)

   - Soil type and condition (Erodability)

   - Rainfall intensity (Erosivity)

  • Agents of erosion

   - Water

   - Wind

   - Human beings

   - Animals

  • Types of erosion

   i) Splash/rain drop

   ii) Sheet

   iii) Rill

   iv) Gully

      - gully formation

      - types of gullies

   v) Riverbank

   vi) Solifluction

   vii) Landslides

  • Soil erosion control

   (i) Biological/cultural control

      - Grass strips

      - Cover crops

      - Grassed waterways

      - Contour farming and strip cropping

      - Mulching

      - Afforestation/reafforestation

   (ii) Physical/structural controls

      - Stone lines

      - Filters/strip

      - Trashlines

      - Terraces - level, graded, broad, based, narrow- based, bench, fanya juu, fanya chini.

      - Bunds

      - Cut-off- drains/Diversion ditches

      - Gabions/porous dams

      - Ridging

 21.2.2  Water harvesting

  • Roof catchment

  • Rock catchment

  • Weirs and dams

  • Ponds

  • Retention ditches/Level terraces

21.2.3 Micro- Catchments

  • Types

  • Laying out and construction methods

  • Uses

Note

- A local soil conservation officer to be contacted for necessary tools and demonstration of skills in establishing level and graded terraces

- Learners to practice using levelling boards, line and spirit level to develop conservation structures.

- Learners to carry out soil and water conservation work in and or out of school wherever appropriate