Divisi
When to plant Sweet potato in Soanierana Ivongo
Analanjirofo, Madagascar
Sweet potato is a trailing vine you grow from vine cuttings (slips), not from seed and not by planting the root.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 22 Mar 2027 – 31 Mar 2027 opens in 25 weeks | 2 Mar 2027 – 11 Mar 2027 |
| Expected harvest | about 15.2 t/ha | about 12.9 t/ha |
| Harvest | From 20 Jun 2027 to 28 Aug 2027, depending on the planting date | |
| Ready to harvest | 90–150 days after planting | |
| Work it takes | 70–148 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 22 Mar 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Soanierana Ivongo is close to normal, so these dates match the pattern the area usually follows.
Planting after 31 Mar 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Soanierana Ivongo
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 45% |
For sweet potato in Soanierana Ivongo, the lie of the land is the tightest of the three at 45%. 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 Soanierana Ivongo
| When the rains are expected | September 2025 to September 2025 |
|---|---|
| Rain in a typical year | About 1,913 mm |
| This season's rain | Rain close to usual — plan around about 1,913 mm falling roughly when it always does |
| This season's heat | Hotter than usual — about +0.8 °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 | 2 kinds of ground. The season below is the largest that farms — about 97% of this area. |
| 97% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 365 growing days · about 2,120 mm · January to December |
|---|---|
| 3% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 365 growing days · about 3,020 mm · January to December |
last updated 17 September 2026
Sloping ground holds back about 35% of yield here.
What sweet potato needs to grow here
| Soil it likes | well-drained sandy, sandy loam or loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.0 and 6.5 |
| Rain it needs | About 750–1,000 mm across the season |
| Spacing | 100 cm between rows, 30 cm between plants |
| Feed it most with | potassium and nitrogen |
What it takes to grow sweet potato in Soanierana Ivongo
| Planting material | About 33,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 61 kg per hectare |
| Phosphate (P₂O₅) | About 23 kg per hectare |
| Potash (K₂O) | About 122 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. |
| Hand work | 70–148 days per hectare, by hand |
These are the nutrients a sweet potato 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 Sweet potato with a plan, not a guess
Everything above describes Soanierana Ivongo 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.
Sweet potato 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 sweet potato grow well in Soanierana Ivongo?
Soanierana Ivongo rates as favourable for sweet potato.
When should I plant sweet potato in Soanierana Ivongo?
Typically 22 Mar 2027 to 31 Mar 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Soanierana Ivongo, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
