Storage Structures SS2 Horticulture and Crop Production Lesson Note

Class: SS2

Subject: Horticulture and Crop Production

Why Do We Need Storage?

Imagine you harvest 100 baskets of tomatoes today, but you can only sell 10. If you leave the other 90 in the sun, they will rot by tomorrow.

Storage is the art of keeping agricultural produce in good condition from the time of harvest until they are needed for eating or selling. Good storage prevents Post-Harvest Loss, which is one of the biggest problems for farmers in Nigeria.

Traditional Storage: The Barn

A barn is one of the oldest and most common ways to store crops like yams, coco-yams, and sometimes maize.

• How it works: It is usually an open-air structure made of wooden poles and palm fronds. Yams are tied vertically to the poles using ropes (usually “Ikpaza” or local twine).
• The Benefit: It allows plenty of air (ventilation) to move around the tubers. This keeps them cool and prevents them from rotting quickly.
• The Problem: Rats and squirrels can easily climb the poles to eat the yams. Also, if the sun is too harsh, the yams can “shrink” and lose weight.

Large Scale Storage: The Silo

If you see a giant, tall metal “can” at a farm or a government depot, that is a Silo. Silos are used for storing large amounts of grains like maize, rice, and cowpea.

• How it works: They are airtight cylinders made of metal or concrete. Grains are dried thoroughly before being poured in from the top.
• The Benefit: Because they are airtight, pests like weevils cannot breathe inside, so they die. It can keep grains fresh for many years.
• The Problem: They are very expensive to build. If the grain is even slightly wet when it goes in, the whole silo can grow mold and spoil.

Keeping it Cool: Refrigerators and Cold Rooms

Horticultural crops (like lettuce, cabbage, strawberries, and flowers) are very delicate. They are mostly made of water, so they “breathe” and die fast.

1. Refrigerators:

• These are for small-scale storage, usually in homes or small shops.
• How it works: They use electricity to keep the temperature very low (0∘C to 5∘C). This “sleeps” the bacteria that cause rotting.

1. Cold Rooms:

• This is basically a “giant refrigerator” the size of a whole room. It is used by big vegetable exporters or supermarkets.
• The Benefit: You can walk inside it. It allows a farmer to keep thousands of crates of tomatoes fresh for weeks while waiting for a good price in the market.

Simple Rules for Good Storage

No matter what structure you use, these three rules must be followed:

1. Cleanliness: Always clean the barn or silo before putting in new crops. Old dust often hides “baby” insects waiting to eat your new harvest.
2. Dryness: Grains must be bone-dry. If you can’t “crack” a maize grain with your teeth, it is too wet for a silo.
3. Ventilation: For yams and onions, air must flow. If the air stays still, the temperature rises, and the crop starts to “sweat” and rot.

Summary for the Student

Storage is like a “Time Machine.” It allows a farmer to harvest in October but sell in March when prices are high. Whether you use a simple wooden barn or a high-tech cold room, the goal is the same: Keep it cool, keep it dry, and keep the pests out.

Teacher’s Classroom Discussion

Ask the students: “In your house, where do you keep your onions? Where do you keep your yams? Why don’t we put yams in the refrigerator?” (Answer: Yams are too bulky and prefer the natural air of a barn or a cool dark corner).