Divisi
When to plant Irish potato in Guernini
Djelfa, Algeria
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 | 2 Mar 2027 – 22 Mar 2027 opens in 22 weeks |
| Expected harvest | about 40.3 t/ha |
| Harvest | From 11 May 2027 to 30 Jul 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 22 Mar 2027. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Guernini is close to normal, so these dates match the pattern the area usually follows.
Planting after 22 Mar 2027 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Guernini
| Rain and temperature | 88% |
|---|---|
| The soil | 76% |
| The lie of the land | 88% |
For irish potato in Guernini, 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 season in Guernini
| Rain in a typical year | About 242 mm |
|---|---|
| This season's rain | Rain close to usual — plan around about 242 mm falling roughly when it always does |
| What that supports | enough rain for one short crop, and only if timed to it, warm, with a cool spell that slows winter growth |
| Ground this covers | 2 kinds of ground. The season below is the largest that farms — about 96% of this area. |
| 96% | enough rain for one short crop, and only if timed to it; warm, with a cool spell that slows winter growth 105 growing days · about 250 mm |
|---|---|
| 4% | enough rain for one short crop, and only if timed to it; warm, with a cool spell that slows winter growth 109 growing days · about 250 mm |
last updated 18 September 2026
Frost and pest pressure hold back about 20% of yield here.
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 Guernini
| 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 Guernini 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 irish potato grow well in Guernini?
Guernini rates as favourable for irish potato.
When should I plant irish potato in Guernini?
Typically 2 Mar 2027 to 22 Mar 2027, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Guernini, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.