Lesson Note on Farm Machinery: Shellers, Dryers and Incubators for SS 2

Class: Senior Secondary School 2 (SS2 / SSS2)
Term: 3rd Term
Week: 2
Age: 16 years
Duration: 45 minutes
Subject: Agricultural Science
Curriculum Theme: Agricultural Technology
Previous Lesson: Farm Machinery: Meaning, Tractors and Bulldozers.
Topic: Farm machinery continues
Subject Matter: Farm machinery continues (shellers, dryers, incubators, milling machines)

Specific Objectives

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

Cognitive Domain:

• Identify different types of shellers, dryers, incubators, and milling machines.
• Explain the specific uses of shellers, dryers, incubators, and milling machines in agriculture.

Affective Domain:

• Appreciate the importance of these farm machines in modern agricultural practices.
• Value the role of technology in increasing efficiency and productivity in farming.

Psychomotor Domain:

• Recognize images or real-life examples of shellers, dryers, incubators, and milling machines.
• Differentiate between the functions of various farm processing machines.

Social Domain:

• Participate actively in discussions about the application of farm machinery.
• Collaborate with peers to identify and describe different farm machines during a virtual or actual visit.

Reference Materials

The following resources were used in planning this lesson:

• Senior Secondary Schools Education Curriculum
• State Unified Scheme of Work
• Essential Agricultural Science for Senior Secondary Schools by O. A. Iwena.
• https://www.agro-allied.com
• https://www.agricmachinery.ng

Instructional Materials

The teacher will teach this lesson with the aid of:

• Photos of processing machines (shellers, dryers, incubators, milling machines)
• Chart showing different farm equipment
• Video clips demonstrating the operation of these machines
• Access to an agro-service centre or mechanized farm (if feasible)

Rationale for the Lesson

This lesson helps pupils understand the various machines used in processing farm produce and livestock. It enables them to appreciate the role of technology in modern agriculture, which is important for increasing efficiency and ensuring food security.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of simple farm tools and implements, and some understanding of farm machinery from previous lessons.

Lesson Content/Board Summary

Farm Machinery (Continued)

Shellers

Shellers are farm machines used for removing the outer covering (shell) of grains, nuts, or seeds from their edible parts. This process is called shelling or threshing.

Types of shellers include:

• Maize sheller (manual or mechanical)
• Groundnut sheller
• Rice thresher/sheller
• Cowpea thresher

Dryers

Dryers are machines used to reduce the moisture content of farm produce to a safe level for storage, processing, or consumption. Drying helps to prevent spoilage, mold growth, and insect infestation.

Types of dryers include:

• Sun dryers (natural drying)
• Mechanical dryers (e.g., batch dryers, continuous flow dryers, cabinet dryers)
• Solar dryers

Incubators

Incubators are devices used to provide a controlled environment (temperature, humidity, ventilation) for the artificial hatching of eggs. They mimic the natural conditions provided by a brooding hen.

Functions of an incubator:

• Maintains optimal temperature for embryo development.
• Controls humidity to prevent excessive moisture loss from eggs.
• Provides adequate ventilation for oxygen supply and carbon dioxide removal.
• Allows for the turning of eggs to prevent the embryo from sticking to the shell.

Milling Machines

Milling machines are used to grind or mill grains (like maize, millet, sorghum, rice) or other farm produce into flour, meal, or feed for humans and livestock. This process increases the usability and digestibility of the produce.

Types of milling machines include:

• Hammer mills
• Disc mills
• Roller mills

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to recall some farm machines discussed in the previous lesson. The teacher then introduces the topic: “Farm Machinery (Continued)” focusing on shellers, dryers, incubators, and milling machines.
Pupils’ Activity: Pupils respond to the teacher’s questions and listen attentively to the introduction.
Learning Point: Pupils recall previous knowledge and are prepared for the new lesson.

Step 2: Shellers

Time: 8 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains what shellers are and their importance in agriculture. The teacher shows pictures or video clips of different types of shellers (e.g., maize, groundnut) and explains how they work.
Pupils’ Activity: Pupils observe the pictures/videos, listen to the explanation, and ask questions for clarification.
Learning Point: Pupils understand the function and types of shellers.

Step 3: Dryers

Time: 8 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher explains the purpose of dryers in farm produce preservation and lists various types of dryers (e.g., sun, mechanical, solar). The teacher uses illustrations to show how different dryers operate.
Pupils’ Activity: Pupils listen, take notes, and identify different types of dryers from the illustrations.
Learning Point: Pupils learn about the importance and methods of drying farm produce.

Step 4: Incubators

Time: 8 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher defines an incubator and explains its role in artificial hatching of eggs. The teacher discusses the essential conditions maintained by an incubator (temperature, humidity, ventilation) with the pupils.
Pupils’ Activity: Pupils actively participate in the discussion, explain the conditions, and take notes.
Learning Point: Pupils understand the function and working principles of incubators.

Step 5: Milling Machines

Time: 6 minutes
Teaching Skill: Explanation/Categorization
Teacher’s Activity: The teacher explains what milling machines are and their use in processing grains into flour or feed. The teacher lists and briefly describes different types of milling machines.
Pupils’ Activity: Pupils listen, observe, and identify the uses of milling machines.
Learning Point: Pupils understand the purpose and types of milling machines.

Step 6: Discussion and Consolidation

Time: 5 minutes
Teaching Skill: Questioning/Facilitation
Teacher’s Activity: The teacher leads a brief discussion, asking pupils to compare and contrast the functions of two different machines discussed. The teacher consolidates the learning points, emphasizing the importance of farm machinery in modern agriculture.
Pupils’ Activity: Pupils respond to questions and summarize the key functions of the machines.
Learning Point: Pupils consolidate their understanding and appreciate the interconnectedness of farm machinery.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

1. Define a sheller and state two crops it can process.
2. Explain why farm produce needs to be dried.
3. List three conditions that an incubator maintains for hatching eggs.
4. Mention two types of milling machines and their primary use.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization/Assignment
Teacher’s Activity: The teacher summarizes the key learning points of the lesson. The teacher assigns homework: “Draw and label any two farm machines discussed today and write a short paragraph on their importance.”
Pupils’ Activity: Pupils copy the homework assignment.
Learning Point: Pupils reinforce their learning and prepare for future topics.

Lesson Keywords

• Sheller – A machine used to remove the outer covering from grains, nuts, or seeds.
• Dryer – A machine used to reduce the moisture content of farm produce.
• Incubator – A device used for the artificial hatching of eggs under controlled conditions.
• Milling Machine – A machine used to grind grains into flour or meal.
• Processing – The treatment of farm produce to prepare it for consumption or storage.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to research other types of farm machinery or their economic impact. For pupils needing more support, the teacher can provide simplified diagrams, additional explanations, or pair them with a peer for collaborative learning.

Note for teachers using this lesson plan

Teachers should encourage pupils to relate the machines to local farming practices where possible. If an actual visit to an agro-service centre or mechanized farm is not feasible, use high-quality video demonstrations or virtual tours to enhance understanding. Emphasize the practical applications and economic benefits of these machines.