Don’t Lose Your Harvest: A Post-Harvest Storage Guide

You spent four months growing your maize. You harvested it. Then three bags rotted in the corner of the store, or you sold too cheap because your grain was still damp when the buyer checked it with his moisture meter.

That is not a farming problem. That is a storage problem. And unlike the weather, it is one you can fix entirely on your own.

The Harvest You Already Paid For Is the One You Are Losing

Uganda loses between 20 and 40 percent of its grain after harvest. The Kilimo Trust found farmers lose roughly 3 bags out of every 10, through poor drying, spillage, mould and pests. For a farmer harvesting 20 bags of maize, that is six bags gone. Six bags you paid seed, labour and land preparation for.

The damage does not stop at your store. In 2021, Kenya banned Ugandan maize imports because aflatoxin levels were too high. Uganda’s maize exports to Kenya collapsed from 94,382 tonnes to just 2,765 tonnes in a single year. Every farmer who dried badly that season contributed to that ban, and every farmer who dries well helps lift it.

The market for clean, well-dried grain is strong. Uganda is the food basket of the region. The farmers who capture that market are the ones whose grain reaches the buyer in the same condition it left the field.

What You Can Actually Do About It

1. Dry until the grain is genuinely dry. Maize must reach about 13.5 percent moisture before it goes into any bag. Do not judge by how it looks. Use a cheap moisture meter if you can afford one. A shared meter in a farmer group pays for itself in one season. No meter? The salt test works: put a handful of grain and a spoon of dry salt in a sealed jar, shake it for a minute, and leave it. If the salt sticks to the grain, your grain is still too wet. If it stays loose, it is dry enough to store.

2. Do not bag warm grain. When grain leaves the sun it is still holding heat, and heat means moisture moving around inside the bag. Spread it on the drying floor or tarpaulin to cool for a few hours first. In Uganda’s second rainy season, grain that is bagged warm can start growing mould within days.

3. Cool first, then bag into hermetic storage. Hermetic bags (GrainPro, PICS and similar brands) seal the grain so tightly that insects use up the oxygen and die. No chemicals needed, no weevil damage, and they can be reused for several seasons. A single bag costs under UGX 10,000 and can hold your whole harvest. Compare that to the value of the three bags you lost last season.

4. Store with a gap under your feet and around the walls. Put your bags on pallets, stones or a raised platform, never directly on the floor. Keep them off the wall too. Damp rises from below and pests travel along walls. This costs nothing and prevents the two most common storage losses.

5. Buy as a group, store as a group. Hermetic bags, moisture meters and proper drying floors are cheaper and far more effective when a farmer group buys them together. Many cooperatives also aggregate grain after drying and sell in bulk, which gets a better price than selling bag by bag. Talk to your group about what shared equipment would save you the most money this season.

6. Check for aflatoxin the simple way. Aflatoxin is a poison produced by moulds that grow on badly dried grain. You cannot see it and you cannot smell it, but it is what caused Kenya’s ban, and it is what makes grain unsafe for your own family to eat. A simple field check: roast a handful of grain in a dry pan. Grain with aflatoxin smell gives off a bitter, musty, almost chemical odour that changes when heated. Fine grain smells like roasted maize. If your grain smells bitter, do not eat it, do not sell it, and do not feed it to livestock. Use it for compost instead. The lesson: the roast test only signals a problem you should have prevented at drying time.

7. Where to get the bags. Hermetic bags are sold by most large agro-dealers, through many cooperative supply points, and by distributors of major brands including GrainPro and PICS. Ask your local agro-dealer first, and if they do not stock them, ask your district agricultural officer which suppliers deliver to your area. Buying a pack of ten shares the transport cost across your group.

The Uganda Context

Post-harvest loss is one of the biggest invisible costs in Ugandan agriculture. The Ministry of Agriculture and agencies like the Kilimo Trust have spent years promoting hermetic storage and proper drying in districts from Kamuli to Masindi. The evidence is consistent: farmers who dry properly and store in hermetic bags keep 90 percent or more of their grain, compared to the 60 to 80 percent kept by farmers who do not.

The market reward is real. Buyers now check moisture with meters at the point of purchase, and they pay for quality. Clean, dry, pest-free maize from a farmer who can explain how it was stored commands a better price than grain of unknown quality. Drying properly is not just about saving grain. It is about getting paid properly the grain you save.

What To Do Today

This season, dry first and bag second. Decide now (before harvest) where your drying floor will be, who you can borrow a moisture meter from, and whether your group is buying hermetic bags together. Do not let three months of work disappear in a grain bag.

Share this guide with the farmers in your village before harvest day. The bags are cheap. The lesson is cheaper.