Table 1.
General information about the soils used in this study
| AR-control | AR-N | AR-PL | AR-PL-Alum | SK | PEI | Till Ref | |
|---|---|---|---|---|---|---|---|
| Source | USDA-ARS plots, Fayetteville, AR USA | AAFC, SK Canada | AAFC, PEI, Canada | CCRMP, NRC, Canada | |||
| Treatment | Control soil | Commercial N treatment | Untreated poultry litter | Alum-treated poultry litter | Continuous wheat | No till | Commercial Reference Material |
| Depth, cm | 0–5 | 0–5 | 0–5 | 0–5 | 0–7.5 | 0–5 | B, C horizons |
| pH (H20) | 5.7 | 4.8 | 6.3 | 5.4 | 5.9 | 4.7 | 5.9 |
| Total N, % | 0.17 | 0.21 | 0.25 | 0.24 | 0.20 | 0.17 | 0.20 |
| Total C, % | 1.68 | 2.03 | 2.39 | 2.06 | 2.09 | 2.29 | 2.03 |
| Total P, mg kg−1 | 473 | 470 | 1345 | 1733 | 548 | 1097 | 930 |
| Organic P, mg kg−1 (%)a | 241 (51) | 211 (45) | 216 (16) | 730 (42) | 278 (51) | 407 (36) | 374 (40) |
| Organic P, mg kg−1 (%)b | 144 (51) | 177 (54) | 165 (22) | 483 (41) | 177 (52) | 175 (23) | 139 (39) |
| References | [15, 30, 39] | [31] | [32] | ||||
aDetermined by the ignition method
bDetermined by P-NMR spectroscopy