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PROBLEM-BASED E-LEARNING SYSTEM FOR AGRICULTURE EXTENSION

Soil and Water Conservation SOIL CONSERVATION


Course Objectives

Introduction

Factors influencing erosion

(a) Land use and ground cover

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

(c) Soil type and condition (Erodability)

(d) Rainfall intensity (Erosivity)

Agents of erosion

(a) Water

(b) Wind

(c) Human beings

(d) Animals

Types of erosion

(a) Splash/rain drop

(b) Sheet

(c) Rill

(d) Gully (Types and formation)

(e) Riverbank

(f) Solifluction

(g) Landslides

Biological  controls

(a) Grass strips

(b) Cover crops

(c) Grassed waterways

Cultural Controls

(a) Contour farming and strip cropping

(b) Mulching

(c) Afforestation

(d) Reafforestation

Physical controls

(a) Stone lines

(b) Filters/strip

(c) Trashlines

(d) Terraces (level, graded, broad, based, narrow- based, bench)

 Bunds

(e) Cut-off- drains/Diversion ditches

(f) Gabions/porous dams

(g) Ridging


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