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Table 1 General information about the soils used in this study

From: Characterizing the phosphorus forms extracted from soil by the Mehlich III soil test

  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]  
  1. aDetermined by the ignition method
  2. bDetermined by P-NMR spectroscopy
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