Divisi
When to plant Irish potato in Água Grande
Sao Tome and Principe
The Irish potato (mbatatisi, ikirayi, viazi mviringo) is a cool-weather crop grown for the tubers that swell underground — it is not a grain, and it is not the same plant as sweet potato.
| Fit | Favourable |
|---|---|
| When to plant | 30 Jun 2027 – 9 Jul 2027 opens in 39 weeks |
| Expected harvest | about 40.3 t/ha |
| Harvest | From 8 Sep 2027 to 16 Nov 2027, depending on the planting date |
| Ready to harvest | 70–130 days after planting |
| Work it takes | 110–185 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 30 Jun 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Água Grande 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 9 Jul 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Água Grande
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 60% |
For irish potato in Água Grande, the lie of the land is the tightest of the three at 60%. 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 2026/27 season in Água Grande
| When the rains are expected | August 2026 to July 2027 |
|---|---|
| Rain in a typical year | About 1,692 mm |
| This season's rain | Leaning dry — January, February, September, October, November and December 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. |
| 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 50% of this area. |
| 50% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 346 growing days · about 1,820 mm · August to July |
|---|---|
| 50% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 344 growing days · about 1,690 mm · August to July |
last updated 17 September 2026
What irish potato needs to grow here
| Soil it likes | well-drained loam or sandy loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 5.0 and 6.5 |
| Spacing | 75 cm between rows, 28 cm between plants |
| Feed it most with | potassium and magnesium |
What it takes to grow irish potato in Água Grande
| Planting material | About 47,000 plants per hectare |
|---|---|
| Nitrogen (N) | About 133 kg per hectare |
| Phosphate (P₂O₅) | About 40 kg per hectare |
| Potash (K₂O) | About 234 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 | 110–185 days per hectare, by hand |
These are the nutrients a irish 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 Irish potato with a plan, not a guess
Everything above describes Água Grande 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.
Irish 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 irish potato grow well in Água Grande?
Água Grande rates as favourable for irish potato.
When should I plant irish potato in Água Grande?
Typically 30 Jun 2027 to 9 Jul 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Água Grande, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
