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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)