The content is just an excerpt from the complete note for JSS 1 Third Term Agricultural Science Lesson Note – Effects of Weeds Control Methods on Vegetation and Soil. Check below to download the complete PDF
CONTENT:
- Effects of weeds control methods on vegetation and soil
- Dispersal of weeds (weed dissemination)
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Sub-Topic 1: Effects of weed control methods on vegetation and soil
Effect of chemical control:
- Herbicides can be poisonous to human beings.
- Beneficial organisms may be destroyed.
Effect of chemical control:
- Burning can kill beneficial soil organisms.
Effect of mechanical/physical control:
- The use of machine and farm implements e.g tractor and plough, destroys soil structure.
Effect of biological control:
- Predator may feed on crop rather than weeds
Sub-Topic 2: Adverse effects of weeds/Problems posed by weed in Agriculture/ Economic Importance of weeds
The harm done by weeds is due mainly to their competition with crops. these are some of the reasons why weed pose challenge to farmers, hence a need for them to be
Weeds harbour crop pests and diseases.
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