Agricultural Science·Plant production · NSSCO 3.3.3
Weeds & their control
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You plant your maize, you water it, you wait — and up come plants you never sowed, stealing the space between the rows. Those are weeds. In this lesson we learn what a weed really is, why weeds rob our crops of water, light, nutrients and yield, how a weed like the blackjack spreads, and the four ways a good Namibian farmer fights back — cultural, mechanical, biological and chemical — and which one gives the best value for money.
What you'll learn in this lesson
By the end you should be able to (NSSCO Agricultural Science 3.3.3):
- Identify a named weed species affecting crops in Namibia
- Investigate and describe a weed's harmful effects and its mode of spread
- Describe biological, cultural, mechanical and chemical weed control
- Discuss the cost-effectiveness of the methods of weed control
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Miss Olivia and Mike talk through the whole topic — with the figure and working drawn live.