Table 1.
Basic physical and chemical properties of the soils, and soil K testing values on control soils using different soil testing methods.
| Site | Abbreviation | State | EC (µS cm−1) | pH | Organic Carbon (%) | CaCl2 K (mg kg−1) | Colwell K (mg kg−1) | NH4OAc K (mg kg−1) | DGT K (mg L−1) | Exchangeable Ca (cmol kg−1) | Exchangeable Mg (cmol kg−1) | CEC (cmol kg−1) | Clay (%) | Sand (%) | Silt (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karoonda | KD | SA | 93 | 6.43 | 0.28 | 73 | 71 | 77 | 7.2 | 0.7 | 0.2 | 1.0 | 3 | 95 | 2 |
| Lake Bolac | LB | VIC | 90 | 5.78 | 1.33 | 71 | 69 | 76 | 10.0 | 1.9 | 0.3 | 2.4 | 3 | 92 | 4 |
| Ngarkat | NK | SA | 17 | 6.55 | 0.62 | 20 | 21 | 22 | 2.6 | 0.9 | 0.1 | 1.0 | 4 | 94 | 2 |
| Gindie B | QB | QLD | 47 | 6.95 | 0.47 | 11 | 28 | 34 | 0.6 | 9.6 | 7.1 | 17.1 | 67 | 18 | 15 |
| Capella B | QC | QLD | 48 | 7.04 | 0.60 | 21 | 81 | 94 | 1.0 | 18.0 | 8.9 | 17.3 | 68 | 20 | 12 |
| Kingaroy | QL | QLD | 59 | 5.30 | 1.11 | 34 | 65 | 56 | 1.9 | 2.3 | 1.3 | 27.5 | 41 | 43 | 16 |
| Jandowae | QS | QLD | 67 | 6.01 | 0.51 | 44 | 100 | 135 | 1.2 | 7.2 | 6.2 | 14.9 | 66 | 12 | 22 |
| Regans Ford | RF | WA | 141 | 6.14 | 2.17 | 48 | 52 | 56 | 6.4 | 3.1 | 0.3 | 3.6 | 4 | 94 | 2 |
| Wickepin | WN | WA | 69 | 5.32 | 0.81 | 32 | 47 | 37 | 3.9 | 0.7 | 0.1 | 1.0 | 6 | 88 | 6 |