Table 14 Criteria (reclassification) for land suitability of teff crop in Ambesh watershed
Land quality | Land characteristics | Unit of measurement | Suitability class | |||
|---|---|---|---|---|---|---|
Highly Suitable (S1) | Moderately Suitable (S2) | Marginally Suitable (S3) | Not Suitable (N) | |||
Climate | Temperature (t) | ℃ | 16–20 | 13.74–16 | 20–25 | 25–30 |
Rain fall (rf) | mm | 400–908.1 | 908.1–1000 | 1000–1402 |  < 400; > 1402 | |
Topography | Altitude (alt) | masl | 1700–2200 | 2200–2400 | 2400–2800 |  < 1000, > 2800 |
Slope (s) | degree | 0–4.3 | 4.3–7.6 | 7.6–11.7 | 11.7–25.45 | |
Physical soil properties | Soil texture(txr) | css | C, CL | Si, L | SiL, L, SL | S |
Soil structure(str) | Â | VF, F | F | M | C | |
Soil depth(dp) | cm |  > 50 | 25–50 | 10–25 |  < 10 | |
Chemical soil properties | Organic matter | % | 3.3–5.2 | 2.7–3.3 | 1–2.7 |  < 1 |
Ele. conductivity | µs/cm | 14.7–25.1 | 25.1–34.6 | 34.6–48.1 | 48.1–71.3 | |
Soil pH:H2O | H2O | 5.2–5.5 | 5–5.2 | 5.0–5.2 |  < 4.5; > 8 | |
CEC | meq/100 g | 29.9–31.5 | 29.3–29.9 | 28.7–29.3 | – | |
Total N | % | – | – | 0.17–0.28 | 0.085–0.017 | |
Phosphorous (P) | ppm | – | – | 12.9 – 13.48 | 12.5–12.9 | |
Potassium (K) | ppm | – | – | 0.57–0.58 | 0.5–0.57 | |
CaCO3 | % | 20.3–21.8 | 21.8–22.4 | 22.4–23.1 | 23.1–24.2 | |