The fertilizer types used in Uganda come down to a short list. Six granulated products make up most of what input shops stock: urea, DAP, CAN, ammonium sulphate and two NPK compounds. Beside them sit animal manure and compost, which still do most of the feeding on smallholder plots. Which one belongs on your field depends on the nutrient your soil lacks and the stage the crop has reached.
One note on how numbers are written here. A compound fertilizer bag prints its nutrient ratio with dashes, so DAP appears on the sack as 18 dash 46 dash 0. This page writes the same ratios with colons, so 18:46:0, purely for readability. The figures mean exactly what the bag says.
Why Fertilizer Use in Uganda Stays So Low
Uganda applies less mineral fertilizer per hectare than almost anywhere else farming is done commercially. World Bank figures put consumption at around 3 kg of nutrients per hectare of arable land, against a world average above 150 kg. Fewer than 8 percent of farming households buy any inorganic fertilizer at all.
That matters because the soil is not standing still. The Uganda National Fertilizer Policy, approved by Cabinet in 2016 after work led by MAAIF with the Economic Policy Research Centre at Makerere University, puts average nutrient depletion at roughly 80 kg of nutrients per hectare each year. Independent studies land in the same band, somewhere between 70 and 90 kg, split across nitrogen, phosphorus and potassium. Every harvest carts nutrients off the plot. Very little goes back.
Cost is the reason most often given, and it is a real one. Knowledge is the other. Plenty of farmers who could afford a bag are not confident which bag to buy, and a wrong choice is money burned. The African Union set a target at the Abuja fertilizer summit in 2006 of at least 50 kg per hectare across the continent, up from an average of 8 kg then. Uganda is still a long way below it.
Straight Fertilizers and Compound Fertilizers
The first split worth learning is between straight and compound fertilizer. A straight fertilizer supplies one main nutrient. Urea is the clearest case: nitrogen and nothing else. A compound fertilizer, sometimes called a complex or a blend, carries two or three of the main nutrients in one granule.
Straights give you control. If a soil test says the plot is short of nitrogen but holding enough phosphorus, a straight nitrogen product puts nitrogen on and wastes nothing. Compounds give you convenience. One pass, one bag, three nutrients, which suits a farmer who has no test result and wants a reasonable general feed.
The trade is real. Buy a compound without knowing your soil and you pay for nutrients the field did not need. Buy straights without knowing your soil and you may correct the wrong shortage. That is why the soil test that comes before any fertilizer application earns its fee faster than most farm spending.
Nitrogen Fertilizers on the Ugandan Market
Nitrogen drives leaf and stem growth, and it is the nutrient Ugandan soils run out of first. Three nitrogen fertilizers are commonly sold.
Urea at 46 percent nitrogen is the most concentrated solid nitrogen source on sale anywhere, the cheapest per kilogram of nitrogen, and the most traded fertilizer in the country. It carries one condition attached, and it is a strict one: urea only pays if you get it under the soil, because uncovered granules give up a large part of their nitrogen to the air. If urea is the bag you are considering, read how to apply urea without losing its nitrogen first. That page is where the mechanism and the field routine live.
CAN, calcium ammonium nitrate, carries around 26 to 27 percent nitrogen plus about 8 percent calcium. Less nitrogen per bag than urea, so you carry more weight for the same feed, but it barely loses nitrogen to the air and it is gentler on soil pH. Farmers who top dress in unpredictable weather often prefer it. Our page on choosing between CAN and urea as a nitrogen source works through that decision properly.
Ammonium sulphate supplies nitrogen plus sulphur. Sulphur deficiency shows up on Ugandan soils more often than most farmers realise, particularly on land that has grown maize for many seasons without any organic matter going back. The catch with ammonium sulphate is that it acidifies soil faster than the other two, so on land already testing acidic it is the wrong first choice.
Phosphorus Fertilizers for Planting Time
Phosphorus builds roots and sets grain, and a crop needs it early. It is also the nutrient most Ugandan soils are genuinely short of, because phosphorus locks onto clay and iron in acid soils and stops moving.
DAP, diammonium phosphate at 18:46:0, is the phosphorus fertilizer you will find in almost every input shop in the country. It supplies 18 percent nitrogen along with 46 percent phosphate, which is why it doubles as a starter feed. Because phosphorus does not travel through soil, DAP has to go in at planting, placed close to where the seed sits. Our page on DAP placement, rates and its effect on soil acidity covers the placement rules, which genuinely change the result.
TSP, triple superphosphate, is the straight phosphate alternative and turns up less often. It carries phosphate without the nitrogen, which suits a legume crop that fixes its own nitrogen. Bean and groundnut growers who already have nodulation working sometimes do better with a straight phosphate than with DAP.
Rock phosphate appears occasionally, usually sold as a slow release or organic friendly option. It releases phosphorus very slowly and works best on acid soils, so it is a soil building input rather than a fix for a crop that needs phosphorus this season.
Potassium and the NPK Compound Fertilizers
Potassium moves water and sugar through the plant and firms up fruit. Straight potassium, sold as muriate of potash or MOP, is stocked in Uganda but sells in small volumes, mostly to banana, coffee and horticulture growers who know their soils are short of it.
Most potassium reaches Ugandan fields inside a compound. Two NPK grades dominate. NPK 17:17:17 is the balanced workhorse, equal parts of the three main nutrients, and it is what an input dealer will hand you if you ask for "NPK" without saying more. NPK 25:5:5 plus 5S leans heavily towards nitrogen with a little phosphate, potash and sulphur, and it behaves more like a top dressing fertilizer than a planting one.
Crop specific blends have appeared on the market too, mixed for coffee, maize or horticulture. They can be good value when the blend genuinely matches your soil test. Read the ratio on the bag rather than the crop name on the front. The guide to reading NPK grades and what each number means goes into the arithmetic.
| Fertilizer | Main nutrients | When it is used |
|---|---|---|
| Urea | 46% N | Top dressing |
| DAP 18:46:0 | N and phosphate | At planting |
| CAN | N and calcium | Top dressing |
| Ammonium sulphate | N and sulphur | Top dressing |
| NPK 17:17:17 | All three | At planting |
| NPK 25:5:5 | Mostly N | Top dressing |
Organic Fertilizer, Manure and Compost on Ugandan Farms
Mineral fertilizer is the minority input in Uganda. Far more land is fed by cattle manure, poultry litter, compost, crop residues and green manure crops, and on many plots that is the only feeding the soil gets.
Organic sources carry nutrients at low concentration, which means volume. A mineral bag delivers in 50 kg what a manure heap delivers in a tonne or more. What manure gives back that a bag cannot is organic matter: structure, water holding, and a soil biology that keeps releasing nutrients between crops. On a sandy plot in the cattle corridor, or on a hillside garden that has been cropped for decades, the organic matter is often doing more good than the nutrients.
Poultry litter is the strongest of the common organic sources and needs composting before it goes near a growing crop, because fresh litter burns roots. Cattle manure is milder and slower. Compost lets you use kitchen and crop waste and lifts organic matter steadily. Green manure crops such as mucuna and canavalia build nitrogen in place without anything being carried in.
The honest answer for most Ugandan smallholders is both, not either. Organic matter to hold the soil together, a modest amount of mineral fertilizer to supply what the crop needs this season. Start with the organic fertilizer options open to Ugandan farms and add mineral inputs on top of that base rather than instead of it.
Which Fertilizer Types Farmers in Uganda Actually Buy
Market assessment work by IFDC in Ugandan input shops found that six granulated products account for 74 percent of all granulated fertilizer traded in the country: urea, DAP, NPK 17:17:17, NPK 25:5:5 plus 5S, CAN and ammonium sulphate. Urea and DAP are the two biggest by volume.
Everything else, and that includes liquid feeds, foliar sprays, crystalline water soluble products, calcium nitrate and the various micronutrient mixes, shares the remaining quarter between them. Liquids and foliars matter in greenhouse and high value horticulture, and they are worth knowing about. They are not what feeds the maize.
The practical use of that list is narrowing. A farmer walking into an input shop with no plan faces dozens of sacks. In reality the decision is nearly always between a planting fertilizer, which means DAP or an NPK compound, and a top dressing nitrogen, which means urea or CAN. Get those two right and you have done most of what fertilizer can do for a field crop.
Matching a Fertilizer Type to Your Crop and Your Soil Test
No fertilizer type is correct in the abstract. The right one is whichever supplies what your particular field is short of, for the crop you are growing, at the rate that pays.
Soil pH decides more of this than most farmers expect. Maize performs best between pH 6.0 and 7.0 according to MAAIF's own maize production guidance, and a great deal of Ugandan cropland tests below that. On acid soil, phosphorus you apply gets locked up and a nitrogen fertilizer that acidifies further makes the problem worse. The MAAIF guidance is to test first, then lime at the recommended rate at least three months ahead of planting, then fertilize. Liming out of order wastes both inputs.
Crop stage decides the rest. Phosphorus goes in at planting because the seedling needs it in its first weeks and cannot chase it later. Nitrogen goes on in splits while the crop is growing, because a single heavy dose leaches away or burns. Potassium timing is more forgiving and usually rides along with the planting fertilizer.
Rates deserve a warning of their own, because Ugandan evidence pulls two ways. Replacement arithmetic, which starts from what a good crop removes from the soil, points to fairly heavy rates. Ugandan field trial economics point much lower, because the rate that pays is not the rate that maximises yield. Uganda has a proper tool for this, the Uganda Fertilizer Use Optimizer, whose extension sheets are zoned by region and tiered by what a farmer can afford, with the top tier openly aimed at profit per acre instead of maximum yield. Its maize numbers land well under the 50 kg per acre of DAP that trade material keeps repeating. What settles a rate is the ratio between what fertilizer costs you and what your grain fetches: when that ratio is high, the profitable rate drops sharply and every extra bag loses money. Work the ratio out at the time you buy rather than following a number published in a different market.
For a maize field, that translates into a phosphate source in the planting furrow and a nitrogen source once or twice during growth. Our maize fertilizer application guide sets out the schedule crop by crop, and the fertilizer requirement calculator turns a recommendation in kilograms per hectare into bags for your actual acreage.
Fertilizer Quality, Bag Weight and Storage in Ugandan Conditions
Buying the right fertilizer type does not help if what is in the sack is not what the label claims. Two Ugandan studies have looked hard at this, and their findings are worth carrying into an input shop.
On weight, IFDC weighed 120 randomly selected 50 kg bags in Ugandan markets and found 10 percent short by more than the half kilogram tolerance. On nutrient content, nitrogen in urea turned out very hard to alter and shortages were rare, and DAP's nitrogen was fully compliant. The compound grades were weaker: total nitrogen was out of compliance in 13 percent of NPK 17:17:17 samples and 27 percent of NPK 25:5:5 plus 5S samples.
On physical condition, 15 percent of bags examined had caked to some degree, urea worst of all. The stores are the reason. Humidity inside the premises visited ran at a median of 55 percent, and at that level several fertilizers begin taking water out of the air as soon as the thermometer clears 30 degrees. Add the 22 percent of stores piling sacks ten deep, which crushes whatever is at the bottom, and the 38 percent working without pallets, where a bag on bare concrete wicks damp upwards all day.
Laboratory work at Makerere flagged a separate hazard in small packs. Splitting a 50 kg bag into 1 kg and 2 kg portions is a genuine service to a farmer who cannot buy a whole sack, yet the handling drives moisture up, and repacked urea tested weaker on nitrogen than the sealed bag it had been scooped from. Buying small is fine; buying small from a shop with slow stock and a damp back room is not.
Handling Fertilizer Safely on the Farm
These are concentrated salts, and the ammonium products in particular are unkind to skin and eyes. Nothing here is exotic, but the basics get skipped.
Wear gloves when you are hand placing granules, which is how most Ugandan smallholders apply fertilizer, and rinse your hands before eating. Granules in an eye need flushing with clean water straight away. Dust off a caked bag is an irritant to breathe, so break lumps outside and stand upwind. Anyone spending a morning broadcasting should keep a long sleeved shirt on.
Storage is where the real risks sit. Bags belong away from anything an animal eats and away from planting seed, because a split sack leaning against a feed drum is a straightforward route to a dead cow. Keep the store dry and the bags raised, which protects the product and you at the same time. Children treat coloured granules as something to play with, so a locked store or a high shelf is not overcautious. Sleeping rooms are not stores. And an empty fertilizer sack has no business holding grain, flour or water afterwards, no matter how useful it looks.
Fertilizer and pesticide should not share a shelf. If a container has no legible label, treat it as unknown and do not use it on a food crop. The same reading skills apply to both, and our guide on how to read an agrochemical label properly is the place to start if the printing on a sack means nothing to you.
Frequently Asked Questions About Fertilizer Types in Uganda
Which fertilizer is most used in Uganda? Urea and DAP, by a wide margin. Market work in Ugandan input shops found those two are the highest traded granulated products, and together with NPK 17:17:17, NPK 25:5:5 plus 5S, CAN and ammonium sulphate they account for around 74 percent of granulated fertilizer sold.
Can I use manure and mineral fertilizer together? Yes, and on most Ugandan soils that combination beats either one alone. Manure and compost supply organic matter and slow release nutrients, which improves how well the soil holds water and how much of your mineral fertilizer the crop actually takes up. Apply well rotted manure ahead of planting and use the mineral bag to top up what the crop needs in season.
Do I really need a soil test before I buy fertilizer? If you are spending on fertilizer every season, yes. Without a test you are guessing which nutrient is limiting and how acid the soil is, and those two answers change which bag you should buy and whether you need lime first. A test costs a fraction of one season's fertilizer bill and it stops you paying for nutrients the field already has.
How can I tell if a bag of fertilizer is genuine? Check the weight on a scale, check the seam and inner liner are intact, check the granules pour instead of sitting in lumps, and read the nutrient ratio against the breakdown printed below it. Buy from a dealer registered with MAAIF, which regulates fertilizer under the Agricultural Chemicals (Control) Act of 2006, and keep the receipt. No visual check catches a nutrient shortage, which is why the dealer's reputation matters.
Is fertilizer dangerous to keep at home? It needs respect rather than fear. Store it dry, off the floor, out of reach of children and livestock, and well away from animal feed, seed and drinking water containers. Keep it separate from pesticides. Wear gloves when handling granules and rinse skin afterwards.
What do the different fertilizer types cost in Uganda? Prices move constantly, because almost all mineral fertilizer is imported and the landed cost tracks the exchange rate, international fertilizer prices and freight. Within any given week the same product also costs differently in Kampala than upcountry, and small repacked quantities cost more per kilogram than a sealed 50 kg bag. Compare current fertilizer prices in Uganda before you budget, and work in cost per kilogram of nutrient rather than cost per bag, since a bag of urea and a bag of CAN do not carry the same amount of nitrogen.
Choosing the type is the thinking part, and this page has done most of it. Sourcing rewards a bit of legwork, since two dealers in the same town will quote differently for an identical sack and the gap widens the further you are from the port. Look over what input suppliers stocking fertilizer in Uganda are asking, glance at the current price page before you hand anything over, and give the bag itself a proper inspection at the counter. The farm inputs hub gathers the rest of the seed, fertilizer and agrochemical guides.