Divisi
When to plant Yam in Nigeria
Known here as doya · isu · ji
Yam is a climbing vine that grows one big food tuber underground over a long 7-11 month season.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 6 Mar 2027 – 15 Apr 2027 opens in 22 weeks | 21 Jan 2026 – 1 Jan 2027 |
| Expected harvest | about 23.2 t/ha | same |
| Harvest | From 2 Sep 2027 to 10 Mar 2028, depending on the planting date | |
| Ready to harvest | 180–330 days after planting | |
Rain-fed. These dates are worked out from each place's own rainfall, for a field watered by the season — with irrigation a window can open earlier, close later, or come round more than once a year. Check your own field under What grows, or get the Divisi app for a calendar dated to your farm.
If you only get one chance to plant, aim for around 26 Mar 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Nigeria leans dry, so these dates sit later than the long-run average. Planting on the date you are used to risks germinating into a false start and having to replant.
Planting after 15 Apr 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Nigeria
| Rain and temperature | 96% |
|---|---|
| The soil | 76% |
| The lie of the land | 88% |
For yam in Nigeria, the soil is the tightest of the three at 76%. This is the one you can actually move. Lime raises a sour soil, manure and compost lift what it holds, and both work within a season or two — money spent here changes the answer.
The 2026 season in Nigeria
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | March 2026 to November 2026 |
| Rain in a typical year | About 1,111 mm in a typical farming district |
| Across its districts | From about 232 mm in the driest of 774 districts to about 3,692 mm in the wettest |
| This season's rain | Leaning dry — September and October look short of rain. Plant at the early end of the window, favour quicker and more drought-tolerant crops, and keep moisture in the soil: mulch, and weed early. |
| This season's heat | Hotter than usual — about +0.7 °C over the growing months. Heat makes the same rain do less, so a dry spell bites sooner: do not plant late, and shade or mulch what you can. |
| What that supports | enough rain for one full main crop, warm all year, so nothing but rain ends the season |
| Ground this covers | 4 kinds of ground. The season below is one typical farming district's, not a figure for the whole of this area. |
| 44% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 226 growing days · about 1,160 mm · April to November |
|---|---|
| 38% | enough rain for one short crop, and only if timed to it; warm all year, so nothing but rain ends the season 144 growing days · about 700 mm · May to October |
| 9% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 318 growing days · about 2,380 mm · February to December |
| 4% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 278 growing days · about 1,550 mm · February to November |
last updated 17 September 2026 · from all 774 areas within it
Frost and pest pressure hold back about 15% of yield here.
What yam needs to grow here
| Soil it likes | well-drained sandy loam or loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.5 and 7.0 |
| Spacing | 100 cm between rows, 100 cm between plants |
| Feed it most with | nitrogen and potassium |
What it takes to grow yam in Nigeria
| Planting material | About 10,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 87 kg per hectare |
| Phosphate (P₂O₅) | About 26 kg per hectare |
| Potash (K₂O) | About 133 kg per hectare |
| In the shops | A basal compound at planting — Compound D, or an NPK blend — covers the phosphate and potash. A nitrogen top dressing — urea or AN — goes on once the crop is established. |
These are the nutrients a yam crop of that size carries off the field. What you actually apply depends on what your soil already holds — which is what a soil test, or the app's field records, tell you.
What to watch for
Grow Yam with a plan, not a guess
Everything above describes Nigeria as a whole — your own soil, slope and rainfall will shift the dates. The Divisi app works them out for your field, and dates each job that follows.
Yam in nearby districts
This calendar moves
Planting windows shift with the forecast. Leave your email and we'll send what changed, and a note when planting time nears — a couple of emails a month at most.
Frequently asked questions
Will yam grow well in Nigeria?
Nigeria rates as favourable for yam.
When should I plant yam in Nigeria?
Typically 6 Mar 2027 to 15 Apr 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Nigeria, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
