Divisi
When to plant Bambara groundnut in Bosso
Diffa, Niger
Known here as gujiya
Bambara groundnut (Vigna subterranea) is one of Africa's own beans — a tough, low, bushy plant, often grown by the women of the household on the poorest, sandiest land where maize would fail.
| Fit | Favourable |
|---|---|
| When to plant | 28 Oct 2026 – 27 Dec 2026 opens in 4 weeks |
| Expected harvest | about 2.0 t/ha |
| Harvest | From 26 Jan 2027 to 15 Jun 2027, depending on the planting date |
| Ready to harvest | 90–170 days after planting |
| Work it takes | 77–157 days per hectare, by hand |
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 28 Oct 2026. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Bosso is close to normal, so these dates match the pattern the area usually follows.
Planting after 27 Dec 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Bosso
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 96% |
For bambara groundnut in Bosso, rain and temperature is the tightest of the three at 96%. This one is fixed. It is why the planting window above is where it is — hitting those dates is the whole of your control here.
The season in Bosso
| Rain in a typical year | About 195 mm |
|---|---|
| This season's rain | Rain close to usual — plan around about 195 mm falling roughly when it always does |
| What that supports | too dry for rain-fed cropping without irrigation, warm all year, so nothing but rain ends the season |
| Ground this covers | 2 kinds of ground. The season below is the largest that farms — about 94% of this area. |
| 94% | too dry for rain-fed cropping without irrigation; warm all year, so nothing but rain ends the season no rain-fed season · about 210 mm |
|---|---|
| 6% | too dry for rain-fed cropping without irrigation; warm all year, so nothing but rain ends the season no rain-fed season · about 190 mm |
last updated 17 September 2026
Frost and pest pressure hold back about 15% of yield here.
What bambara groundnut needs to grow here
| Soil it likes | well-drained sand or sandy loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.0 and 6.5 |
| Spacing | 40 cm between rows, 15 cm between plants |
| Feed it most with | phosphorus and calcium |
What it takes to grow bambara groundnut in Bosso
| Planting material | About 125,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 100 kg per hectare — the crop fixes most of this itself; inoculated seed matters more than a bag |
| Phosphate (P₂O₅) | About 20 kg per hectare |
| Potash (K₂O) | About 50 kg per hectare |
| In the shops | A basal compound at planting — Compound D, or an NPK blend — covers the phosphate and potash. Skip the nitrogen top dressing; inoculated seed does that job. |
| Hand work | 77–157 days per hectare, by hand |
These are the nutrients a bambara groundnut 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 Bambara groundnut with a plan, not a guess
Everything above describes Bosso 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.
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 bambara groundnut grow well in Bosso?
Bosso rates as favourable for bambara groundnut.
When should I plant bambara groundnut in Bosso?
Typically 28 Oct 2026 to 27 Dec 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Bosso, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.