| Treatments | 0 - 5 cm | 5 - 10 cm | 10 - 20 cm | |||
| K total | K available. | K total | K available. | K total | K available. | |
| mg∙kg−1 of soil | ||||||
| Conv. tillage | 1988 ± 273 | 89 ± 12 | 1733 ± 160 | 99 ± 4 | 2002 ± 194 | 75 ± 2 |
| Direct Sowing | 1867 ± 139 | 131 ± 21 | 1878 ± 200 | 103 ± 3 | 2050 ± 191 | 77 ± 9 |
| DMC/B. ruz. | 1685 ± 99 | 146 ± 9 | 2090 ± 328 | 82 ± 1 | 1990 ± 113 | 70 ± 2 |
| DMC/B. ruz. + Muc. | 1966 ± 332 | 128 ± 14 | 1976 ± 284 | 1001 ± 2 | 1733 ± 134 | 68 ± 6 |
| DMC/C. juncea | 1709 ± 64 | 141 ± 20 | 1736 ± 91 | 82 ± 3 | 2076 ± 162 | 69 ± 3 |
| F | 0.458 | 1.982 | 0.455 | 0.31 | 0.718 | 0.637 |
| P (0.05) | 0.766 (ns) | 0.149 (ns) | 0.767 (ns) | 0.867 (ns) | 0.593 (ns) | 0.644 (ns) |