Divisi
When to plant Green gram in Ambatolampy
Vakinankaratra, Madagascar
Green gram (also called mung bean or ndengu) is a fast, warm-weather bean that goes from seed to harvest in just 60–90 days — quick enough to dodge a dry spell and to slot in after your maize, sorghum or millet.
| Measure | Rain-fed | With irrigation |
|---|---|---|
| Fit | Favourable | |
| When to plant | 26 Oct 2026 – 5 Dec 2026 opens in 4 weeks | 1 Jan 2026 – 31 Oct 2026 |
| Expected harvest | about 0.8 t/ha | same |
| Harvest | From 25 Dec 2026 to 5 Mar 2027, depending on the planting date | |
| Ready to harvest | 60–90 days after planting | |
| Work it takes | 60–124 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 5 Nov 2026. That is the point in the window where the rains are most reliably established.
This season's rainfall outlook for Ambatolampy 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 5 Dec 2026 leaves the crop short of season: it runs into the dry months before it has finished filling.
What decides this in Ambatolampy
| Rain and temperature | 96% |
|---|---|
| The soil | 96% |
| The lie of the land | 45% |
For green gram in Ambatolampy, 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 2026/27 season in Ambatolampy
| Rainy seasons | One each year — one chance to plant, so timing carries it |
|---|---|
| When the rains are expected | October 2026 to July 2027 |
| Rain in a typical year | About 1,517 mm |
| This season's rain | Leaning dry — January and February 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. |
| This season's heat | Hotter than usual — about +1.2 °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 | 4 kinds of ground. The season below is the largest that farms — about 34% of this area. |
| 34% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 283 growing days · about 1,390 mm · October to July |
|---|---|
| 29% | enough rain for a long crop, or two in a year; warm all year, so nothing but rain ends the season 328 growing days · about 1,400 mm · October to September |
| 15% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 243 growing days · about 1,370 mm · October to June |
| 15% | enough rain for one full main crop; warm all year, so nothing but rain ends the season 198 growing days · about 1,320 mm · October to May |
last updated 17 September 2026
Sloping ground holds back about 45% of yield here.
What green gram needs to grow here
| Soil it likes | well-drained loam or sandy loam soil |
|---|---|
| Soil sourness (pH) | Happiest between pH 6.0 and 7.5 |
| Spacing | 37 cm between rows, 10 cm between plants |
| Feed it most with | phosphorus |
What it takes to grow green gram in Ambatolampy
| Nitrogen (N) | About 32 kg per hectare — the crop fixes most of this itself; inoculated seed matters more than a bag |
|---|---|
| Phosphate (P₂O₅) | About 8 kg per hectare |
| Potash (K₂O) | About 14 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 | 60–124 days per hectare, by hand |
These are the nutrients a green gram 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 Green gram with a plan, not a guess
Everything above describes Ambatolampy 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.
Green gram 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 green gram grow well in Ambatolampy?
Ambatolampy rates as favourable for green gram.
When should I plant green gram in Ambatolampy?
Typically 26 Oct 2026 to 5 Dec 2026, forecast-adjusted.
Is this exact for my own field?
No — these are readings taken across Ambatolampy, not on your field. Soil, slope and rainfall change from one farm to the next. Check your own location to see your own numbers.
