Land qualities

S₁

(100 - 85)

S₂

(84 - 60)

S₃

(59 - 40)

N₁

(39 - 20)

N₂

(19 - 0)

Climate (c):

Annual rainfall (mm)

1000 - 1800

600 - 1000

500 - 600

400

< 400

Lenght dry season (months)

3 - 5

5 - 6

6 - 7

Any

> 7

Mean annual temperature (^oC)

20 - 30

> 30

any

any

any

Topography (t):

Slope (%)

0 - 8

8 - 16

16 - 30

30 - 50

> 50

Wetness (w):

Drainage

Well

Moderate

Poor

Very poor

Non- drainable

Soil physical properties (s):

Texture

L, SCL, SL, SiC, SiCL, CL, SiL, SC

LFS, LS, FS

C, FS

any

Si

Coarse fragments (Vol %) 0 - 10 cm

< 3

< 15

< 35

Any

> 35

Soil Depth (cm)

> 100

> 75

> 50

any

< 50

Fertility (f):

CEC (cmol_c kg^-1)

> 16

10 - 16

3 - 9

< 3

any

Base saturation (%)

> 35

20 - 35

10 - 19

< 10

any

Organic carbon (g kg^-1), 0 - 15 cm

8-15

5-7

3 - 6

1 - 2

< 1

pH (H₂0)

5.5 -7.5

5.0 - 5.5/7.5 - 8.0

4.0 - 4.9/8.0 -8.5

4.0/8.0

< 4.0; >8.0

Total N (%)

> 0.15

0.10 - 0.15

0.08 - 0.10

0.04 - 0.08

< 0.04

Available P (mg kg^-1)

> 22

13 - 22

7 -13

3 - 7

< 3

Exchangeable  K   (cmol_c kg^-1)

> 0.5

0.3 - 0.5

0.2 - 0.3

0.1 - 0.2

< 0.1

Exchangeable Ca (cmol_c kg^-1)

10 - 15

5 -10

1- 5

< 1; > 5

any

Exchangeable Mg (cmol_c kg^-1)

2 - 5

1 - 2

< 1

< 1; > 5

any