WEEK 10 & 11
SUBJECT: AGRICULTURAL SCIENCE
CLASS: PRIMARY 4
Subtitle: Meaning of weed
At the end of this lesson, pupils should be able to:
The teacher will teach the lesson with the aid of: charts and pictures showing the different types of house.
Resources and Materials:
Scheme of work
All relevant materials
9-Years Basic Education Curriculum
Building Background/connection to prior knowledge: pupils are familiar with the topic in their previous classes.
There are numerous definitions of a weed, including:
Methods used in controlling weed
Cultural weed control – One of the easiest ways to control weeds is through prevention or cultural control. Close planting in the garden can reduce weed growth by eliminating open space. Cover crops are good for this as well. Adding mulch will prevent light from getting to weed seeds and prevents growth. Mechanical weed control –
Mechanical control of common weed plants can be accomplished through hand pulling, hoeing, digging or mowing (which slows growth and reduces seed formation). While these methods are effective, they can be time consuming.
Chemical weed control
Certain characteristics are associated with and allow the survival of weeds. Weeds posses one or more of the following:
a) abundant seed production;
b) rapid population establishment;
c) seed dormancy;
d) long-term survival of buried seed;
e) adaptation for spread;
f) presence of vegetative reproductive structures; and
g) ability to occupy sites disturbed by human activities.
Weeds are troublesome in many ways. Primarily, they reduce crop yield by competing for water, light, soil nutrients, and space. Other problems associated with weeds in agriculture include:
a) reduced crop quality by contaminating the commodity;
b) interference with harvest;
c) serve as hosts for crop diseases or provide shelter for insects to
d) limit the choice of crop rotation sequences and cultural
e) production of chemical substances which are toxic to crop plants
(allelopathy), animals, or humans.
Step: Teacher revises the previous topic.
Step 2: Teacher introduces the new topic.
Step3: Teacher explains the new topic.
Step4: Teacher welcomes pupils questions.
Step5: Teacher evaluates the pupils.
Assessment & Evaluation:
Wrap up (conclusion):
Teacher goes over the topic once again to enhance better understanding.
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