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Table 5 Assigned weighing indices for various parameters used for assessment of soil quality (Kosmas et al. 1999)

From: Study of desertification sensitivity in Talh region (Central Tunisia) using remote sensing, G.I.S. and the M.E.D.A.L.U.S. approach

 

Class

Description

 

Weight

Texture

1

Good

L, SCL, SL, LS, CL

1

2

Moderate

SC, SiL SiCL

1.2

3

Poor

Si, C, SiC

1.6

4

Very poor

S

2

Slope

1

Very gentle to flat

< 6%

1

2

Gentle

6–18%

1.2

3

Steep

18–35%

1.5

4

Very steep

> 35%

2

Parent material

1

Good

Shale, schist, basic, ultra-basic, Conglomerates, unconsolidated

1

2

Moderate

Limestone, marble, granite, Rhyolite, Ignimbrite, gneiss, siltstone, sandstone

1.7

3

Poor

Marl, Pyroclastics

2

Soil depth

1

Deep

> 75

1

2

Moderate

75–30

2

3

Shallow

15–30

3

4

Very shallow

< 15

4

Drainage

1

Well drained

 

1

2

Imperfectly drained

 

1.2

3

Poorly drained

 

2

Rock fragments

1

Very stony

> 60

1

2

Stony

20–60

1.3

3

Bare to slightly stony

< 20

2

  1. L loam, SCL sandy clay loam, SL sandy loam, LS loamy sand, CL clay loam, SC sandy clay, SiL silty loam, SiCL silty clay loam, Si silt, C clay, SiC silty clay, S sand