Category | Soluble salts (dS/m or mmho/cm) | pH | Sand (%) | Silt (%) | Clay (%) | Texture class* | Organic Matter (%) | % Coarse fragments (> 2 mm in diameter)** | Sodium Adsorption Ratio (SAR)* |
Ideal | <2 | 5.5 to 7.5 | <70 | <70 | <30 | L, SiL | ≥2.0 | ≤2 | <3 for any texture |
Acceptable | <4 | 5.0 to 8.2 | <70 | <70 | <30 | SCL, SL, CL, SiCL | ≥1.0 | 2.1 to 5.0 | 3 to 7 (SiL, SiCL, CL) 3 to 10 (SCL, SL, L) |
Unacceptable | >4 | <5.0 or >8.2 | >70 | >70 | >30 | LS, SC, SiC, S, Si, C | <1.0 | > 5.0 | > 10 for any texture |