Drying coffee in Uganda has one job: bring the lot to the moisture content a buyer will accept, on a surface that is not the ground, without letting it mould or losing weight you could have been paid for. Dry cherry finishes at 13 to 14 percent, wet processed parchment at 12 to 13 percent measured on the bean inside, and both are checked on a meter rather than by eye.
What the Buyer Measures When Your Dried Coffee Arrives
Start at the end, because the drying yard is designed backwards from it. A buyer at the farm gate weighs the lot, reads its moisture, and looks at what is in the heap. The national coffee handbooks put moisture first among the compliance safeguards and describe it as the single factor most able to spoil a grade, which is a strong statement about a step most farmers treat as waiting for the sun.
Four things decide what you are paid, and drying touches three of them: the weight on the scale, the moisture reading, the foreign matter in the coffee, and the out turn the lot will give when it is hulled. Everything below exists to protect those four.
Moisture Targets for Drying Kiboko and Parchment
Uganda's two coffee products dry to two different targets, and there is a third figure in circulation that does not belong on a farm.
Dry cherry, known as kiboko, must be at 13 to 14 percent moisture before sale or milling, and both the Robusta and the Arabica handbook give the same band. Wet processed parchment is dried until the bean inside the hull reaches 12 to 13 percent, again in both handbooks and for both the full wash and the semi wash route. The third number, 11 to 12.5 percent, is the export level, and it is reached after your coffee has left the farm. Drying down to it in your own yard gives away weight for nothing.
Parchment is measured on the bean, not on the hull, which is the detail that trips people up. A parchment lot can feel dry in the hand while the bean inside is still holding water, and a meter reading taken without hulling the sample first is not a reading of anything useful.
Sizing a Coffee Drying Yard for Your Harvest
This is the part no drying advice covers and it is where most smallholders are actually stuck. Both handbooks set the layer depth for the first two or three days at no more than 4 cm, rendered as 4 cm or 1.5 inches, and those two figures do convert correctly, so either unit is safe to work with. Drying kiboko then takes 14 to 30 days depending on the weather. Parchment takes 10 to 15 days on the Robusta handbook's account and 7 to 10 on the Arabica handbook's.
Put those two facts together and a constraint appears. A lot occupies its drying surface for two to four weeks, while Ugandan coffee ripens unevenly and has to be picked selectively over several rounds. So the yard is not sized by your annual crop. It is sized by how much cherry arrives in a picking round multiplied by how many rounds are drying at the same time.
Where the sums do not work, the honest options are fewer cherries picked per round, a second surface, raised tables and mesh that use vertical space, or a shared group drying ground. What does not work is spreading the layer thicker, because that prolongs drying and invites the mould the thin layer rule exists to prevent.
Drying Surfaces, and Why the Ground Spoils the Cup
The handbooks name the acceptable surfaces plainly: a cemented or concrete floor, tarpaulins, clean mats, raised tables, and trays or platforms with a mesh base. Coffee should not be dried directly on soil or any dirty surface, and the reason given is specific rather than general, being that ground drying produces dirty coffee and earthy flavours in the finished cup. That is a defect a cupper finds months later, long after the farmer has been paid or docked.
For parchment the two handbooks give instructions that differ in wording, and both name the same reason. The Robusta handbook advises drying parchment on raised wire mesh platforms under moderate sun to stop the parchment skin cracking. The Arabica handbook advises drying parchment under shade through the full sun, for the same reason. Read together, the operative idea is to cut the intensity during the hottest hours rather than to keep parchment out of the sun altogether, and either instruction satisfies that.
The Drying Day: Turning, Covering and Never Rewetting
Cherry is turned with a rake so it dries uniformly, and it is covered at night and during rain to stop it taking moisture back up. Those two sentences are the entire daily routine in both handbooks, and the second one is where lots are lost.
Contamination has a name here worth knowing. Cherries picked off the ground are frequently contaminated with ochratoxin A from mould growth, which is why both handbooks tell farmers to keep a clean tarpaulin or hessian square under the tree at harvest and to keep ground fallen coffee as a separate lot. Overripe cherry ferments on the tree and carries the same mould risk. No parts per billion figure is published in either handbook and none is invented here: the instruction is to keep the delay between picking and the start of drying to a minimum, and to start drying immediately after leaves and twigs are removed.
Drying Coffee Through a Wet Spell
A long overcast stretch in the middle of a harvest is the situation that ruins coffee, because the lot sits damp while the clock runs. Both handbooks note that farmers are shifting to large and small scale solar dryers to shorten the drying time, and that is the mechanism to think about: a solar dryer earns its cost by cutting the number of days in which a lot can grow mould, and by solving the night cover problem in one move.
Neither handbook publishes a temperature, a capacity or a throughput for a solar dryer, so none appears here. Machine drying has three named failure modes in the Arabica handbook's own defect table, being too fast, too hot and uneven, and the cup result is poor or mottled or faded colour and a dull flavour. Where you are having a cabinet built, price it against what one mould damaged lot costs you rather than against a figure from a brochure. Equipment for the wider job is compared under coffee processing machines.
Cooling and Bagging Dried Coffee
Coffee must be cooled before it goes into a bag. Warm coffee bagged straight off a hot slab makes its own condensation inside the sack, and the lot rewets itself in storage after drying correctly in the yard. That single step is the bridge between drying and keeping.
Then the packaging. Dry coffee goes into clean sisal or jute gunny bags. Storing parchment or kiboko in polythene or woven polybags is prohibited under the handbooks' storage guidance, because coffee in plastic absorbs moisture and grows mould from condensation. Bags sit on pallets raised at least 15 cm off the floor, stacked at least 30 cm clear of the walls, in a store with a cemented floor, plastered walls, a leak proof roof and ventilation, with relative humidity kept below 65 percent on the Arabica handbook's account.
Two things must not share that store. Strong smelling liquids such as petrol, paraffin or diesel, and fertilizers and farm chemicals, because stored coffee takes up and holds foreign odours that are eventually tasted in the cup. The Arabica handbook adds a second exclusion that surprises people: do not use the coffee store for other farm produce such as beans, maize or ginger, to avoid pest movement and cross contamination. First in, first out, as with any grain store.
Proving a Coffee Lot Is Dry Before the Buyer Tells You
Finished kiboko has four physical signs and a commercial one, and the handbooks give them all. It should be black in colour, it should rattle in the shell, it should have no smell, and it should be free of mould and of extraneous matter such as stones and dust. Then the commercial check: a correctly dried lot should hull out at a minimum of 50 percent, with 50 to 60 percent common for kiboko.
The out turn figure does more than one job across this site. It is a unit conversion on the coffee yield page and a pre sale test on the harvesting and post harvest handling page. Here it is the proof that drying finished properly.
What an Undried or Unweighed Coffee Lot Loses at the Farm Gate
The national coffee authority publishes an itemised anatomy of what a thousand kilogramme lot of dry cherry loses when it is sold badly, and it is the most useful table in either handbook because every line is a kilogramme rather than an opinion.
| Deduction | Kilogrammes off 1,000 |
|---|---|
| Scales not calibrated | 50 |
| Moisture discount | 40 |
| Gunny bag weight | 10 |
| Foreign matter | 30 |
| Total discounted | 130 |
That is 13 percent of the load, and three of the four lines are inside the farmer's control before the buyer arrives. The handbook puts the loss from poor drying alone at about 4 percent, and the total loss from dealing in poor quality coffee at 10 to 15 percent. Its own advice is to watch for unethical practice by middlemen and to insist on well calibrated scales and moisture meters, which is unusually direct language for a government handbook and worth repeating exactly as it stands.
Weigh the lot yourself or accept whatever price the other scale produces. The largest single deduction on that list is not a quality problem at all, it is a measurement problem, and it is the one line a farmer can remove completely by weighing their own coffee first. What each of those deductions is worth in shillings is worked through on the cost of coffee farming page, and current indicative levels for each coffee product sit on the coffee price page.
Drying Coffee as a Group
Three of the constraints above are solved better by four farmers than by one. A cemented drying ground is a fixed cost that makes sense across several members' cherry rather than one household's. A moisture meter and a sample scale with a hand huller are affordable shared and expensive alone, and they are the instruments that turn a farm gate negotiation into a measurement. And a group that dries to one standard can bulk lots that a buyer will grade, instead of selling three small heaps of mixed quality.
What a group has to agree on first is the standard, not the price: one moisture target, separate batches by picking round, no ground drying by any member, and the out turn test run before anything is bulked. One member's wet lot mixed into a bulked consignment discounts everybody's. Who buys each coffee product, and where, sits under where to sell coffee.
Frequently Asked Questions
How long does coffee take to dry in Uganda? Kiboko takes 14 to 30 days depending on the weather. Parchment is quicker, and the two handbooks give different bands for it, 10 to 15 days in the Robusta handbook and 7 to 10 in the Arabica handbook, so plan on 7 to 15 days and treat the handbook you are working to as the deciding condition. Arabica parchment is usually drying at altitude, which is a plausible reason the two differ rather than a resolution of it.
How thick should I spread coffee on the drying surface? No more than 4 cm for the first two or three days, which both handbooks give as 4 cm or 1.5 inches. Thicker layers prolong drying and raise the risk of mould, and prolonging the dry is the main way a lot gets spoiled in a wet season.
How do I know the coffee is dry if I have no meter? For kiboko, use all four signs together: black in colour, rattling in the shell, no smell, and free of mould and stones. Then confirm it commercially by hulling a kilogramme sample and checking the out turn is 50 percent or better. For parchment there is no reliable unaided test, because the target is measured on the bean inside the hull.
Can I dry coffee on the bare ground if I sweep it first? No. Ground drying is what produces dirty coffee and earthy flavours in the cup, and cherry that has been in contact with soil carries mould that produces ochratoxin A. A tarpaulin is the cheapest clean surface and it doubles as the night and rain cover.
Is a solar dryer worth buying? It depends on how often your harvest meets a wet spell, since what a dryer buys is fewer days in which a lot can mould. Neither national handbook publishes a capacity, a temperature or a cost for one, so no figure is quoted here. Price a locally built cabinet against the value of the lots you have lost or had discounted, and get more than one quotation on the same specification.
Does wet processed coffee earn more than dry processed? Parchment and clean coffee are priced as different products, so comparing their quoted prices directly is meaningless. To compare properly, convert the parchment price to a clean coffee equivalent using your own out turn before you compare it with a clean coffee quotation, then check both against today's indicative board rather than against a figure on any page.
My coffee got rained on halfway through drying. Is it ruined? Not necessarily, but it is now a separate lot and it needs watching. Rewetted coffee has to dry through the same window again with the moulds already established, so keep it apart from the rest, dry it thin, check it for smell and mould daily, and test its out turn before you let it into a bulked consignment.
Most of what drying coffee well requires is a clean surface, a cover you can pull over the lot fast, and two instruments: a moisture meter and a sample scale with a hand huller. Ask to see a meter working on your own coffee before paying for it, get written quotations from more than one equipment and packaging supplier, and buy sisal or jute rather than the polybags that are prohibited for holding coffee. This page sits in the value addition guides, the processing routes either side of drying are covered under coffee processing methods, and establishment is covered in coffee farming in Uganda.