Land qualities

S₁

(100 - 85)

S₂

(84 - 60)

S₃

(59 - 40)

N₁

(39 - 20)

N₂

(19 - 0)

Climate (c):

Annual rainfall (mm)

1250 - 750

750 - 600

600 - 500

300 - 490

< 300

Length growing season (days)

150 - 270

270 - 325

325 - 345

Any

Ø  345

Mean annual temperature (^oC)

26 - 18

18 - 16

16 - 14

any

< 14

Relative humidity (%)

80 - 42

42 - 36

36 - 30

any

> 30

Topography (t)

Slope (%)

0 - 4

4 - 8

8 -16

Any

> 16

Wetness (w):

Drainage

Well

Moderate

Poor

Poor

Very poor

Soil physical properties (s):

Texture

SC, L, SCL

SL, LFS, LS

C, FS

any

S

Depth (cm)

> 100

75 - 100

50 - 75

20 - 50

< 20

Fertility (f):

CEC (cmol_c kg^-1)

> 24

16 - 24

10 - 16

5 - 10

< 5

Base saturation (%)

> 50

35 - 50

20 - 35

< 20

any

Organic carbon (%)

> 2

1.2 - 2.0

0.8 - 1.2

< 0.8

any

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