Coordinates are rough regional estimates, not the real farm boundaries. SA1 (Free State), SA2 (KwaZulu-Natal), and SA3 (Stellenbosch) coordinates were chosen to represent each region's general growing area for this prototype. Treat the values below as illustrative of the iSDA data shape and resolution — not as the verified soil profile of the actual NAITRO pilot farms. Swap in real farm coordinates to re-query instantly.
SA1 · Bergvlei Grains
Free State
Maize / soya / sunflower — 1,240 ha
-28.4541, 26.7968
SA2 · Umfolozi Cane
KwaZulu-Natal
Sugarcane — 680 ha
-28.3667, 32.0833
SA3 · Kaapzicht Estate
Stellenbosch, Western Cape
Wine grapes + olives — 185 ha
-33.9322, 18.8602
| Property | Unit | SA1 · Bergvlei | SA2 · Umfolozi | SA3 · Kaapzicht |
|---|---|---|---|---|
| Chemical | ||||
| pH | 6.8 (6.6–7.0)0–20cm | 6.3 (6.2–6.4)0–20cm | 6.8 (6.7–6.9)0–20cm | |
| 6.920–50cm | 6.320–50cm | 6.920–50cm | ||
| Nitrogen (total) | g/kg | 0.9 (0.8–1.0)0–20cm | 1.2 (1.1–1.3)0–20cm | 1.2 (1.1–1.3)0–20cm |
| 0.620–50cm | 0.920–50cm | 0.920–50cm | ||
| Aluminium (extractable) | ppm | 11.2 (1.8–52.7)0–20cm | 72.7 (31.8–164.6)0–20cm | 23.5 (7.9–66.5)0–20cm |
| 11.220–50cm | 65.720–50cm | 23.520–50cm | ||
| Calcium (extractable) | ppm | 991.3 (866.1–1134.6)0–20cm | 811.4 (758.4–868.1)0–20cm | 491.7 (306.3–789.1)0–20cm |
| 991.320–50cm | 811.420–50cm | 444.920–50cm | ||
| Magnesium (extractable) | ppm | 297.9 (243.1–364.9)0–20cm | 297.9 (260.2–341.0)0–20cm | 199.3 (132.7–299.3)0–20cm |
| 364.020–50cm | 297.920–50cm | 199.320–50cm | ||
| Potassium (extractable) | ppm | 163.0 (152.3–174.5)0–20cm | 89.0 (77.7–102.0)0–20cm | 108.9 (88.8–133.6)0–20cm |
| 133.320–50cm | 72.720–50cm | 98.520–50cm | ||
| Iron (extractable) | ppm | 72.7 (55.3–95.5)0–20cm | 72.7 (55.3–95.5)0–20cm | 39.4 (34.3–45.3)0–20cm |
| 26.120–50cm | 26.120–50cm | 19.120–50cm | ||
| Cation exchange capacity | cmol(+)/kg | 11.2 (10.4–12.0)0–20cm | 15.4 (14.4–16.6)0–20cm | 8.0 (5.9–10.8)0–20cm |
| 11.220–50cm | 15.420–50cm | 8.020–50cm | ||
| Nutrients | ||||
| Phosphorus (extractable) | ppm | 9.0 (7.7–10.4)0–20cm | 12.5 (10.8–14.4)0–20cm | 15.4 (13.4–17.8)0–20cm |
| 7.220–50cm | 11.220–50cm | 12.520–50cm | ||
| Sulphur (extractable) | ppm | 21.2 (11.9–37.1)0–20cm | 5.7 (4.5–7.2)0–20cm | 26.1 (17.1–39.6)0–20cm |
| 15.420–50cm | 3.520–50cm | 17.220–50cm | ||
| Zinc (extractable) | ppm | 1.5 (1.1–1.8)0–20cm | 2.7 (2.2–3.2)0–20cm | 2.0 (1.8–2.2)0–20cm |
| 1.220–50cm | 2.320–50cm | 1.520–50cm | ||
| Carbon & Organic Matter | ||||
| Carbon (total) | g/kg | 12.5 (11.6–13.4)0–20cm | 29.0 (20.4–41.0)0–20cm | 21.2 (14.8–30.1)0–20cm |
| 11.220–50cm | 21.220–50cm | 19.120–50cm | ||
| Carbon (organic) | g/kg | 7.2 (6.1–8.3)0–20cm | 13.9 (12.0–16.0)0–20cm | 7.2 (6.1–8.3)0–20cm |
| 4.520–50cm | 8.020–50cm | 4.520–50cm | ||
| Physical | ||||
| Texture class | Sandy Clay Loam 0–20cm | Sandy Clay Loam 0–20cm | Sandy Clay Loam 0–20cm | |
| Sandy Clay Loam20–50cm | Sandy Clay Loam20–50cm | Sandy Clay Loam20–50cm | ||
| Sand content | % | 56 (52.0–60.0)0–20cm | 42 (40.0–44.0)0–20cm | 49 (44.3–53.7)0–20cm |
| 5320–50cm | 3920–50cm | 4820–50cm | ||
| Silt content | % | 14 (12.0–16.0)0–20cm | 18 (16.7–19.3)0–20cm | 22 (18.6–25.4)0–20cm |
| 1320–50cm | 1820–50cm | 2120–50cm | ||
| Clay content | % | 24 (22.7–25.3)0–20cm | 27 (25.0–29.0)0–20cm | 25 (21.6–28.4)0–20cm |
| 3020–50cm | 3120–50cm | 2920–50cm | ||
| Bulk density | g/cm³ | 1.5 (1.5–1.5)0–20cm | 1.3 (1.3–1.3)0–20cm | 1.4 (1.3–1.4)0–20cm |
| 1.520–50cm | 1.320–50cm | 1.420–50cm | ||
| Stone content | % | 2.7 (2.0–3.5)0–20cm | 1.2 (0.9–1.5)0–20cm | 2.7 (1.8–3.8)0–20cm |
| 2.720–50cm | 1.220–50cm | 3.120–50cm | ||
| Bedrock depth | cm | 200 (187.0–213.0)0–20cm | 200 (189.0–211.0)0–20cm | 194 (180.0–208.0)0–20cm |
| 20020–50cm | 20020–50cm | 19420–50cm | ||
| Slope angle | ° | 1.4 0–20cm | 10.0 0–20cm | 2.2 0–20cm |
| 1.420–50cm | 10.020–50cm | 2.220–50cm | ||
| Fertility capability class | No constraints 0–20cm | Low K 0–20cm | No constraints 0–20cm | |
| No constraints20–50cm | Low K20–50cm | No constraints20–50cm | ||
Bold value = 0–20cm depth (primary row)
Muted value = 20–50cm depth (sub-row)
(x–y) = 50% confidence interval bounds
About the iSDA Africa Soil Property Service
iSDA (innovative Solutions for Decision Agriculture) operates a continent-wide soil property API at isda-africa.com/api/registration/, built on machine-learning predictions trained against thousands of georeferenced African soil samples. Resolution is 30m × 30m. Each query returns point predictions plus uncertainty bounds — making it usable as a rapid baseline layer before physical soil sampling, or as a sense-check against lab results once they arrive. NAITRO's OBI scoring engine can ingest iSDA values directly for the Chemical and Physical domains (pH, P, K, CEC, texture), while Biological domain indicators (BNF rate, microbial biomass, mycorrhizal colonisation) still require field sampling or grower-reported data — iSDA does not measure soil biology.