JSS 1 Third Term Agricultural Science Lesson Note – Effects of Weeds Control Methods on Vegetation and Soil

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CONTENT:

1. Effects of weeds control methods on vegetation and soil
2. Dispersal of weeds (weed dissemination)

 

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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