Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: First Term
Week: 4
Age: 15 years
Duration: 45 minutes
Subject: Agricultural Science
Curriculum Theme: Agricultural Science
Previous Lesson: Husbandry of Selected Crops.
Topic: Husbandry of Selected Crops (Root and tuber crops) e.g. yam, cassava, sweet potatoes.
Subject Matter: method of propagation of root and tuber crops, climatic and soil requirements for yam cassava and sweet potato, land preparation for root and tuber crops, manuring and fertilizer application, harvesting processing and storage of root and tuber crops

Specific Objectives

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

Cognitive Domain:

Define crop husbandry.
State two methods of propagating root and tuber crops.
List two climatic and soil requirements for yam, cassava, and sweet potato.
Describe the steps involved in land preparation for root and tuber crops.
Explain the importance of manuring and fertilizer application.
Outline the stages of harvesting, processing, and storage for root and tuber crops.

Affective Domain:

Appreciate the importance of proper crop husbandry for increased yield.
Show interest in cultivating root and tuber crops.
Value sustainable farming practices.

Psychomotor Domain:

Demonstrate the correct method of planting yam setts or cassava cuttings.
Participate in land preparation activities on the school farm.
Handle farm tools safely during practical activities.

Work cooperatively with peers during practical farming activities.
Share knowledge about traditional farming methods.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Agricultural Science (Senior Secondary).
State Unified Scheme of Work for Agricultural Science SSS 1.
Agricultural Science for Senior Secondary Schools, Book 1.

Instructional Materials

The teacher will teach this lesson with the aid of:

Yam tubers and cassava cuttings.
Farm tools (hoes, cutlasses, rakes).
Manure samples (e.g., compost, animal dung).
A school farm plot for practical demonstration.
Charts illustrating crop propagation and land preparation.
Samples of NPK fertilizers.

Rationale for the Lesson

This lesson helps pupils understand the practical steps involved in cultivating important root and tuber crops like yam, cassava, and sweet potato. Learning about their husbandry practices enables pupils to grow these crops effectively and contributes to food security in their communities.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of different types of crops and general farming activities from their previous lessons.

Lesson Content/Board Summary

Husbandry of Selected Root and Tuber Crops

1. Methods of Propagation of Root and Tuber Crops

Propagation refers to the process of increasing the number of plants. Root and tuber crops are primarily propagated vegetatively.

The common methods of propagation for selected root and tuber crops include:

Yam: Propagated by setts (portions of the tuber with a suitable outer skin), minisetts (smaller portions), or whole small tubers.
Cassava: Propagated by stem cuttings, which are mature woody stems cut into lengths of about 20-30 cm.
Sweet Potato: Propagated by vine cuttings (pieces of the stem) or by sprouting small tubers to produce slips (young shoots).

2. Climatic and Soil Requirements for Yam, Cassava, and Sweet Potato

For optimal growth, these crops require specific environmental conditions:

Yam:
- Climate: Requires high rainfall (1000-1500 mm annually), warm temperatures (25-30°C), and a distinct dry season for tuber development and harvest.
- Soil: Deep, well-drained, fertile sandy-loam soil with a pH of 5.5-7.0.
Cassava:
- Climate: Tolerant to a wide range of conditions, thrives in warm temperatures (25-29°C) and moderate to high rainfall (1000-1500 mm). Can withstand drought better than yam.
- Soil: Grows well in various soil types but prefers well-drained, light sandy-loam to loamy soils with a pH of 5.0-7.0.
Sweet Potato:
- Climate: Prefers warm temperatures (24-30°C) and moderate rainfall (750-1500 mm). Can tolerate short dry spells.
- Soil: Well-drained, light to medium-textured soils (sandy-loam) with a pH of 4.5-7.0. Excessive nitrogen can promote vine growth over tuber development.

3. Land Preparation for Root and Tuber Crops

Proper land preparation is essential for good root and tuber development.

The key steps include:

Site Selection: Choosing a fertile, well-drained area.
Clearing: Removing existing vegetation (weeds, bushes) by slashing or burning.
Tillage: Ploughing (breaking up the soil) and harrowing (pulverizing and levelling the soil) to create a fine tilth.
Making Ridges/Mounds: Root and tuber crops are often planted on raised beds, ridges, or mounds to ensure good drainage, aeration, and tuber expansion.

4. Manuring and Fertilizer Application

Manuring and fertilizer application replenish soil nutrients and promote healthy crop growth.

Manuring: Involves adding organic matter like compost, farmyard manure, or green manure to the soil. This improves soil structure, water retention, and provides slow-release nutrients.
Fertilizer Application: Involves adding inorganic chemical fertilizers to supply specific nutrients (Nitrogen, Phosphorus, Potassium – NPK) in required amounts.
- Nitrogen (N): Promotes vegetative growth (leaves and stems).
- Phosphorus (P): Important for root development and flowering.
- Potassium (K): Essential for tuber development, disease resistance, and overall plant health.
Application Methods: Fertilizers can be broadcasted, banded, or applied in a ring around the plant.

5. Harvesting, Processing, and Storage of Root and Tuber Crops

These stages are crucial for maintaining the quality and extending the shelf life of the harvested produce.

Harvesting:
- Yam: Harvested when leaves turn yellow and dry, typically 8-11 months after planting. Methods include using hoes or digging forks carefully to avoid damaging tubers.
- Cassava: Can be harvested from 8-24 months after planting, depending on the variety and desired use. The plant is usually pulled by hand, and the roots are detached.
- Sweet Potato: Harvested 3-5 months after planting when leaves start to yellow. Tubers are dug up carefully.
Processing:
- Yam: Can be eaten fresh, boiled, fried, or processed into flour (elubo).
- Cassava: Highly perishable and contains cyanogenic glycosides, requiring processing like grating, fermenting, pressing, and frying (gari) or boiling and pounding (fufu).
- Sweet Potato: Eaten fresh, boiled, roasted, fried, or processed into flour.
Storage:
- Yam: Stored in yam barns, on platforms, or in heaps under shade, ensuring good ventilation and protection from pests and rot.
- Cassava: Fresh roots are highly perishable. Stored in trenches or processed immediately.
- Sweet Potato: Stored in cool, dry, well-ventilated places or processed.

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 reviews the previous lesson briefly. The teacher then asks pupils to name some common root and tuber crops they know and consume in their homes. This leads to the introduction of the topic: Husbandry of Selected Root and Tuber Crops.
Pupils’ Activity: Pupils respond to questions and listen attentively to the teacher’s introduction.
Learning Point: Pupils recall previous knowledge and are prepared for the new topic.

Step 2: Methods of Propagation

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains what propagation means in agricultural terms. Using yam tubers and cassava cuttings, the teacher demonstrates and explains the specific methods of propagation for yam, cassava, and sweet potato, highlighting the differences.
Pupils’ Activity: Pupils observe the demonstration, ask questions, and take notes.
Learning Point: Pupils learn about the various ways root and tuber crops are multiplied.

Step 3: Climatic and Soil Requirements

Time: 7 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher discusses the ideal climatic conditions (rainfall, temperature) and soil types (drainage, texture, pH) required for the successful cultivation of yam, cassava, and sweet potato. The teacher highlights how these requirements may differ slightly for each crop.
Pupils’ Activity: Pupils listen, contribute to the discussion, and note down the key requirements.
Learning Point: Pupils understand the environmental factors necessary for optimal crop growth.

Step 4: Land Preparation

Time: 7 minutes
Teaching Skill: Explanation/Practical Demonstration
Teacher’s Activity: The teacher explains the importance of proper land preparation. The teacher then describes and, if possible, demonstrates on a small plot on the school farm, the steps involved in preparing land, including clearing, tilling, and making ridges or mounds. The teacher emphasizes safety with farm tools.
Pupils’ Activity: Pupils observe the demonstration, ask questions, and may participate in simple tasks under supervision.
Learning Point: Pupils learn the practical steps for preparing farm land effectively.

Step 5: Manuring and Fertilizer Application

Time: 6 minutes
Teaching Skill: Explanation/Visual Aids
Teacher’s Activity: The teacher explains the role of manuring (organic fertilizers) and chemical fertilizers (inorganic) in providing nutrients to the crops. Using samples of manure and NPK fertilizer, the teacher describes their benefits and appropriate application methods.
Pupils’ Activity: Pupils observe the samples, listen to the explanations, and ask questions regarding nutrient roles.
Learning Point: Pupils understand how to enrich soil fertility for better crop yield.

Step 6: Harvesting, Processing, and Storage

Time: 5 minutes
Teaching Skill: Explanation/Discussion
Teacher’s Activity: The teacher explains the appropriate time for harvesting yam, cassava, and sweet potato, noting differences. The teacher then discusses the initial processing steps for each crop and various methods of storage to prevent spoilage and extend shelf life.
Pupils’ Activity: Pupils listen, ask questions about preserving crops, and contribute ideas from their experiences.
Learning Point: Pupils learn how to properly harvest, process, and store root and tuber crops.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

Define crop husbandry.
Mention two methods of propagating root and tuber crops.
State two climatic requirements for yam cultivation.
List three steps involved in land preparation for root crops.
Explain why proper storage is important for harvested tubers.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 3 minutes
Teaching Skill: Closure
Teacher’s Activity: The teacher summarizes the key learning points about the husbandry of root and tuber crops. The teacher encourages pupils to practice what they have learned by cultivating a crop in their homes or on the school farm. The teacher assigns homework: list common pests and diseases of yam, cassava, and sweet potato.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils consolidate their learning and are given a task to reinforce understanding.

Lesson Keywords

Husbandry – The care, cultivation, and breeding of crops and animals.
Propagation – The process of breeding specimens of a plant or animal by natural processes from the parent stock.
Setts – Portions of yam tubers used for planting.
Cuttings – Pieces of stem or vine used to propagate plants vegetatively.
Ridges – Raised beds of soil, often used for planting crops.
Mounds – Small hills of soil created for planting individual crops.
Manuring – The application of organic matter to the soil to improve fertility.
Fertilizer – Any substance added to soil to enhance plant growth.
Processing – The treatment of harvested crops to prepare them for consumption or storage.

Differentiation

For pupils who grasp concepts quickly, the teacher can provide additional research tasks on specific crop varieties or advanced cultivation techniques. For pupils needing more support, the teacher will provide simplified explanations, one-on-one assistance during practical demonstrations, and visual aids to reinforce understanding.

Note for teachers using this lesson plan

Teachers should ensure that practical demonstrations are conducted safely and that pupils understand the importance of hygiene when handling farm produce. Encourage active participation and questions to foster a deeper understanding of agricultural practices.