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|
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
|
- Source: Adapted from Tandon, HLS. Ed (2005); Havlin et al. (1999)
