More maize is lost in the store than in the garden. A household can weed on time, get good rain and bring in a heavy crop, then quietly lose a large share of it over the following months to mould and weevils. Most of that loss traces back to one decision: bagging grain before it was dry enough.
Why dryness matters more than anything else
Grain that still holds moisture keeps breathing in the bag. It warms, it sweats, and moulds that were already sitting harmlessly on the surface start to grow. Some of those moulds produce aflatoxin, which does not wash off, does not cook out, and is not always visible. Maize can look acceptable and still be unsafe.
This is why drying is a food safety job rather than a quality one. It is also why the usual shortcut, bagging early because rain is coming, is the most expensive shortcut on the farm.
Judging dryness without a meter
Few households own a moisture meter. The traditional checks are rough but useful:
- Grain should be hard enough that a thumbnail leaves no dent.
- Bitten between the teeth it should crack sharply, not squash.
- A handful poured from one hand to the other should rattle rather than thud.
- Shelled grain rubbed between the palms should not feel cool or damp.
If any of those tests are borderline, the grain is not ready. Dry it another day and test again. Where a meter is available through a group, a cooperative or a buyer, the widely used target for safe maize storage is around thirteen percent moisture or below.
Drying properly
Dry on a tarpaulin, a raised rack, a cemented surface or mats, never directly on bare soil. Soil puts moisture back into the grain from underneath and brings mould spores and stones with it.
Turn the grain several times a day so the layer underneath is not left damp. Keep the layer shallow rather than heaped. Bring it in before the evening dew rather than leaving it out overnight, because grain reabsorbs moisture from damp night air and you undo the day.
Sort as you go. Cobs that are visibly mouldy, discoloured, insect-bored or sprouted should be separated out and not mixed back in. One bad section can seed a whole bag.
Storing so it stays dry
A good store is dry, ventilated and off the ground:
- Stack bags on pallets or poles, not on the floor, so air moves underneath.
- Keep a gap between the stack and the walls, since walls sweat.
- Fix the roof before harvest, not after the first leak is found.
- Keep the store free of last season is residue, which carries weevils straight into the new crop.
Hermetic bags, where you can get them, work well because they starve insects of oxygen. They only work if the grain went in dry and the bag is sealed properly and not punctured, so they reward good drying rather than replacing it.
Weevils
Check the store monthly. Weevil damage shows as small round holes, fine dust at the bottom of the bag, and grain that feels light. Acting in the first month is far cheaper than acting in the fourth.
If you use a storage chemical, use one actually approved for grain, follow the label rate exactly, and respect the waiting period before the grain is eaten or sold. Storage chemicals are not interchangeable with field sprays, and using the wrong product on food grain is dangerous.
The short version
Dry it hard, keep it off the ground, sort out the bad cobs, and check the store every month. Those four habits save more maize than any input you can buy.
Related reading: Crops and Farming Guides.