Agricultural Science·Soil · NSSCO 2.8
Irrigation & soil drainage
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Namibia is one of the driest countries in Africa, so farmers must bring water to their crops themselves — that is irrigation. We'll define it, see why our low, unreliable rain makes it vital, then meet the four methods (flood, furrow, sprinkler and drip) and find which one saves the most water. Then we'll tackle the opposite trouble — too much water — through leaching and drainage.
What you'll learn in this lesson
By the end you should be able to (NSSCO Agricultural Science 2.8):
- Define irrigation
- Describe methods of irrigation applicable in Namibia: flood irrigation, furrow irrigation, sprinkler irrigation and drip irrigation
- Explain the need for irrigation and its effect on crop yield and quality
- Explain what is meant by leaching
- Discuss the effects of leaching on plant growth
- Define drainage
- Discuss the necessity of draining waterlogged agricultural land
- Describe how soil is drained using ditches and pipe drains
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Miss Olivia and Mike talk through the whole topic — with the figure and working drawn live.