How to reduce post-harvest losses: practical steps for farmers and aggregators

The work of a season can be undone in a few weeks. Tomatoes crushed in sacks on the way to market, maize that grows mould because it was stored too damp, yams that rot in a hot store, grain eaten by weevils — every one of these is money lost after the hard part, growing the crop, is already done.

Post-harvest losses hurt everyone in the chain: the farmer earns less, the aggregator and trader lose stock, and buyers pay more for what survives. Many of the causes are well understood, and many solutions are low-cost. Here are the practical steps that make the biggest difference.

Where losses happen

Losses build up at every stage after the crop is ready:

• At harvest — harvesting too early or too late, or damaging the crop with rough handling.
• During drying — grain left too wet, or dried on bare ground where it picks up dirt and moisture.
• In storage — insects, rodents, mould and heat.
• In transport — crushing, bruising and heat in overloaded vehicles on slow roads.
• At market — produce waiting too long for a buyer, or sold at a distress price because it cannot wait any longer.

1. Harvest at the right time, and gently

Harvest when the crop is at the right maturity for how it will be used and how far it must travel. Fruits and vegetables going to a distant market are often picked slightly earlier than those sold locally. Harvest in the cooler part of the day, keep harvested produce in the shade, and handle it as little as possible — every bruise is a place where rot can start.

2. Dry grain properly before storage

Moisture is the main cause of mould in stored grain, and mouldy grain can be unsafe as well as unsellable. Dry grain on tarpaulins, raised platforms or drying floors rather than bare soil, turn it regularly, and protect it from rain and dew.

Before storing, check that the grain is dry enough. For maize, a moisture content of around 13–14% is a commonly recommended target; a moisture meter gives the most reliable reading, and your extension officer or aggregator can advise on the right level for your crop.

3. Store grain in clean, sealed conditions

• Clean the store before the new harvest goes in, and remove old grain that can carry insects.
• Keep bags off the floor and away from walls, on pallets, so air can move and moisture does not soak in.
• Use hermetic (airtight) storage bags or containers where you can. Sealing grain without air stops insects from surviving, reducing the need for chemicals.
• Inspect regularly for insects, rodents, heat and damp, and act early.
• If you use storage chemicals, use only approved products and follow the label exactly — grain is food.

4. Use crates, not sacks, for fresh produce

Tomatoes, peppers and other soft produce packed in large sacks or baskets are crushed by their own weight. Stackable plastic crates protect produce from crushing, allow air to circulate, and are easy to clean. They cost more upfront, but they can be reused for many seasons.

5. Keep fresh produce cool

Heat speeds up ripening and rot. Keep harvested produce shaded and ventilated. Where electricity is unreliable, simple evaporative coolers made from local materials can lower temperatures for vegetables. For larger volumes, shared or solar-powered cold rooms — often run by cooperatives, aggregators or service providers who charge per crate — are worth looking into.

6. Sort and grade before selling

Separate damaged produce from good produce before storage or transport — one rotten tomato or yam speeds up decay in the ones around it. Grading by size and quality also helps you sell each grade to the right buyer at the right price.

7. Plan the sale before the harvest

Much of the loss on fresh produce happens because it is harvested before there is a buyer. Agree prices and pick-up dates with buyers or aggregators before harvest where you can, and coordinate with other farmers to fill a vehicle so transport is quicker and cheaper.

8. Measure your losses

You cannot reduce what you do not measure. Record how much you harvest, how much you store, and how much you finally sell, at each stage. The gaps show you exactly where your losses are — and which of the steps above will pay off most for your farm. Our farm record keeping guide explains what to record.

The role of cooperatives and aggregators

Many solutions — shared drying floors, hermetic storage, crates, cold rooms and bulk transport — are easier to afford together than alone. Farmer cooperatives and aggregators that pool resources, coordinate harvests with buyers, and keep good records of each member's produce can cut losses across the whole group.

How Amaya & Co. can help

Aggregators and cooperatives that manage many farmers, deliveries and payments need records they can trust. We build and set up the systems behind that:

• Custom software and business automation for aggregators and processors tracking produce from collection to sale.
• Cooperative digitisation for farmer groups pooling produce and payments.
• Training in record keeping and digital tools for farmer groups and programme beneficiaries.

See how we work with agriculture, or contact us to talk about your supply chain.