AOAC SPADA Meeting

Soil experiment guidelines • OECD 106 Guideline • Provides Guidance on: • Chemical properties that should  be known • Soil characteristics • Soil sampling • Soil storage Soil type

pH range (in 0.01 M  CaCl2)

Organic carbon  content (%)

Clay content (%)

Soil texture *

1 2 3 4 5 6 7

4.5‐5.5

1.0‐2.0 3.5‐5.0 1.5‐3.0 3.0‐4.0

65‐80 20‐40 15‐25 15‐30

clay

> 7.5 

clay loam silt loam

5.5‐7.0 4.0‐5.5

loam

< 4.0‐6.0

< 0.5‐1.5 < 0.5‐1.0

< 10‐15

loamy sand

> 7.0  < 4.5 

40‐65 < 10 

clay loam/clay

> 10 

sand/loamy sand