Divisi
When to plant Yam in Ifanadiana
Vatovavy, Madagascar
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 | Moderate | |
| When to plant | 20 Jul 2026 – 28 Oct 2026 open now | 30 Jun 2026 – 28 Oct 2026 |
| Expected harvest | about 9.2 t/ha | same |
| Harvest | From 16 Jan 2027 to 23 Sep 2027, 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 29 Aug 2026. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Ifanadiana is close to normal, so these dates match the pattern the area usually follows.
Planting after 28 Oct 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Ifanadiana
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 30% |
For yam in Ifanadiana, the lie of the land is the tightest of the three at 30%. You cannot flatten it, but you can farm it: plant along the contour rather than up and down, ridge or tie ridges to hold water on the slope, and expect shallower rooting than the crop would manage on flat ground.
The 2025 season in Ifanadiana
| When the rains are expected | September 2025 to September 2025 |
|---|---|
| Rain in a typical year | About 2,135 mm |
| This season's rain | Rain close to usual — plan around about 2,135 mm falling roughly when it always does |
| This season's heat | Hotter than usual — about +1.0 °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 a long crop, or two in a year, warm all year, so nothing but rain ends the season |
| Ground this covers | One kind of ground throughout. |
last updated 17 September 2026
Sloping ground holds back about 65% 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 Ifanadiana
| Planting material | About 10,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 34 kg per hectare |
| Phosphate (P₂O₅) | About 10 kg per hectare |
| Potash (K₂O) | About 53 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 Ifanadiana 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 Ifanadiana?
Ifanadiana rates as moderate for yam.
When should I plant yam in Ifanadiana?
Typically 20 Jul 2026 to 28 Oct 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Ifanadiana, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
