Agriculture JSS 1 Curriculum Guides – Meaning and Characteristics of Common Weeds | Uses and Economic Important of Weeds | Effects and Methods of Controlling Weeds

GOVERNMENT

THEME – CONCEPTS AND MEDIUM OF AGRICULTURAL PRODUCTION 

TOPIC –  METHODS OF WEEDS 

CLASS – SS 1 

LEARNING AREAS – 

INSTRUCTIONAL MATERIALS

1. Charts and pictures of Weeds

2. Weeds specimen

3. Weed album

4. Herbicides

LEARNING OBJECTIVES

By the end of the lesson, students should be able to:

1. list the characteristics of weeds.

2. indicate the uses of weeds.

3. briefly discuss methods of weed control.

4. state the effects of weed control methods on vegetation and soil.

CONTENTS OF THE LESSON

FOCUS LESSONS 

INTRODUCTION (MEANING OF WEEDS) 

Weeds are unwanted plants growing in the farm and other places. Any plant not planted on the farmland by the farmer and grow where they are not wanted is called a weed. Weeds compete with the grown plant for food, water, air and space, such that the wanted plant may eventually die.

A good example of weeds is grass that is growing in a yam farm. Such a plant must be removed in time.

COMMON WEEDS

1. Elephant grass

2. Guinea grass

3. Spear grass

4. Giant star grass

5. bahama grass

6. Carpet grass

7. Pig weed.

CHARACTERISTICS OF WEEDS 

1. Easily Dispersed – Plants cannot move but have many ways of getting around and grow easily. With the activities of man and animals make it easily spread or dispersed. Seeds can be dispersed by wind, water, animals, and humans.

2. Long Dormancy – Plants do not grow easily even under favorable environmental conditions for germination including, temperature, water, light, etc.

USES OF WEEDS TO THE FARMERS 

1. Weeds protect the soil from wind and water erosion.

2. Weeds retain the soil nutrients from plants use.

3. Weed keep and protect the microorganisms that increases soil nutrients for plants use.

4. Weeds are used cover yam from burning after planting.

5. Weeds are used for crops preservation and packaging.

6. Weeds are used for mat production.

7. Weeds are used for feeding livestock.

8. Weeds are used for herbal medicine.

9. Some of them are actually crops. For example, maize is a weed, if grown on yam farmland. The farmer may decide to keep it it is healthy and useful for yam.

ECONOMIC IMPORTANCE OF WEEDS 

1. It reduces the crops production.

2. It reduces the quality of harvest.

3. It increases the cost of crops production.

4. It may poise the animals.

5. The cost of controlling weed is high.

6. It causes quicker wear and tear of farm implements.

EFFECTS OF WEED CONTROL METHODS ON VEGETATION AND SOIL 

1. Pollution of soil and ground water.

2. Contamination of livestock pasture.

3. Expose the soil to erosion – wind and water.

4. Destroy soil micro organisms.

5. It reduces the aquatic animals.

CONTROL METHODS ON VEGETATION AND SOIL

1. Biological Control 

This process involves using animals to feed on the weeds on a farm of tree crops that are fully grown, such as a citrus orchard, rubber plantation and palm plantation. One disadvantage of this method is that the animals may also eat and destroy the wanted plants in the process.

 

2. Cultural Control 

Cultural control is the removal of weed by hands, cutlass or hoe. It involves uprooting weeds with hands, cutlass or hoe. This is also called manual control.

3. Chemical

A chemical is a man-made liquid or powder used for controlling or killing Weeds. It is also used for controlling or killing pets and diseases. This control is called weedicides.

LESSON PRESENTATION

TEACHER’S ACTIVITIES

The teacher,

1. demonstrates chemical control of weeds.

2. highlights the effects of weeds control methods on vegetation and soil.

3. displays pictures and charts of crop pests of the locality.

4. displays specimen of insect pests.

5. summarizes the lessons on the board.

 

STUDENT’S ACTIVITIES

The students,

1. practice weed control on the school farm.

2. study pictures and charts to familiarize self with the local crop.

3. copy the board summary.

LESSON EVALUATION

Teacher asks students to,

1. mention two characteristics of weeds.

2. state two uses of weeds.

3. state two weed control methods.

4. explain two effects of weed control on the environment.