An AI rewrites the narration from your data; the numbers don't change. There's also a version with simple charts.
Your area in numbers
Rainfall and atmospheric water demand, by month
When the orange line (evapotranspiration) rises above the blue bars (rainfall), crops depend on the water stored in the soil.
Show as a table
Risk calendar
Average number of days per month. Darker means more days.
How is your area changing?
Zones of your field
What if the climate changes?
Move the sliders to recalculate everything with less rain or more heat, over the same 30-year record.
Three rotations side by side
Scores go from 0 to 100. The total weights each score by what matters to you. Months marked ⚠ are critical crop stages.
Glossary
- Evapotranspiration (ET)
- The water that leaves the field for the atmosphere: what evaporates from the soil plus what plants transpire. Reference ET (ET0) is the value for well-watered grass; each crop uses a fraction of it.
- Water deficit
- The water a crop would need but can't find, either in the rain or in the soil.
- Cover crop
- A crop sown to protect and improve the soil rather than to sell, such as black oat or vetch.
- First-crop and second-crop
- A first crop is sown on its normal date; a second crop (for example second-crop soybean) is sown later, right after harvesting a winter crop, so one paddock gives two harvests in a year.
- Erosion (RUSLE)
- A formula used worldwide (and in Uruguay's Erosión 6.0 tool from MGAP) to estimate how many tonnes of soil per hectare are lost each year. It combines rainfall strength, soil type, slope and slope length, and how long the soil stays covered.
- Relative wetness (TWI)
- An index of where water runs and collects based on the shape of the land: low spots and drainage lines collect water, while hilltops dry out first. It's relative within your field.
- Root-zone soil moisture
- How full of water the soil is, from 0 (dry) to 1 (saturated). It comes from a NASA model (MERRA-2) that combines satellites and weather stations.
- Frost risk
- Days when the minimum air temperature is 2 °C or lower. We use 2 °C instead of 0 °C because the ground and leaves get colder than the air 2 m above them.
- Dry year
- A bad year that comes about once every five. For rainfall, it's the amount exceeded in 4 out of 5 years; for the crops' water deficit, the amount exceeded in only 1 out of 5 years.
- Satellite vs. field measurements
- A satellite sees a whole area from above (about 50 km here); a rain gauge or sensor measures one exact spot. Combining both is more accurate: your own rainfall records can correct NASA's.
How it works and where the data comes from
- Climate: NASA POWER daily data, 1996–2025 (temperature, rainfall corrected with GPM-IMERG, MERRA-2 soil moisture).
- Evapotranspiration: Hargreaves method (FAO-56), using daily maximum and minimum temperatures.
- Farming year: May to April, so the winter and summer crops of one season stay together.
- Trends: the 1996–2010 average compared with 2011–2025.
- Water balance: month by month, over every real year in the record: effective rainfall (USDA-SCS method) minus crop water use (ET0 × crop coefficient), with the soil acting as a "bucket" of the size you chose.
- Terrain and erosion: NASA SRTM 30 m elevation (through OpenTopoData) on a 15 × 15 grid; slope, water flow (D8) and RUSLE with a month-by-month cover factor from each rotation's calendar, assuming no-till.
- Scores: written, reviewable agronomic rules and thresholds, with no black boxes. No AI makes the decisions.
- Crop table: built from general literature for Uruguay. A local agronomist should validate it.