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Table 9 Limits for soil test values used for rating the soils fertility levels

From: Characterizing soils and the enduring nature of land uses around the Lake Chamo Basin in South-West Ethiopia

Soil fertility level OC (%) Nitrogen Av. P (P2O5) Av. K (K2O) Ca2+ Mg2+ K+ CEC
kg/ha Exchangeable cations (me/100 g soil
Very high > 1.00 > 700 > 80.0 > 360 > 20 > 8 > 1.2 > 40
High 0.81–1.00 561–700 64–80 301–360 10–20 3–8 0.6–1.5 25–40
Medium 0.61–0.80 421–560 48–64 241–300 5–10 1.5–3 0.3–0.6 15–25
Low 0.21–0.60 141–420 16–48 121–240 2–5 0.5–1.5 0.12–0.3 5–15
Very Low < 0.20 < 140 < 16.0 < 120 < 2 < 0.5 < 0.12 < 5
  1. Source: Adapted from Tandon, HLS. Ed (2005); Havlin et al. (1999)