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Table 7 Oxalate and dithionite citrate bicarbonate extractable Al, Fe and P

From: Chemical forms of phosphorous and physicochemical properties of acid soils of Cheha and Dinsho districts, southern highlands of Ethiopia

Sites Alox Feox Pox PSC P aox Ald Fed Ald-Alox Feox/Fed Scaling factor (α)
(mmol kg−1) DPS (%) (mmol kg−1)
SC1 152.37 97.70 5.51 133.54 4.13 173.33 633.66 20.6 0.24 0.62
SC2 139.07 78.54 6.17 116.20 5.31 151.85 478.04 12.78 0.29 0.62
SC3 145.96 88.18 5.82 125.03 4.65 164.07 551.61 18.11 0.27 0.57
SC4 130.07 79.96 6.07 112.16 5.41 144.07 456.25 14.00 0.29 0.59
SC5 126.37 77.46 7.07 108.85 6.49 149.26 491.61 22.89 0.26 0.61
SC6 131.85 76.39 7.32 111.20 6.58 161.11 476.61 29.26 0.28 0.62
SC7 134.37 81.75 6.45 115.41 5.59 150.74 498.75 16.37 0.27 0.56
SD1 90.00 66.21 9.74 83.42 11.68 119.26 313.93 29.26 0.29 0.42
SD2 91.85 82.29 8.26 92.99 8.88 112.19 355.54 20.33 0.26 0.45
SD3 71.89 51.75 12.29 66.02 18.62 134.07 281.07 62.19 0.26 0.45
SD4 90.37 59.43 8.39 79.99 10.49 128.52 307.14 38.15 0.29 0.44
SD5 78.15 63.36 10.35 75.56 13.69 124.07 291.43 45.93 0.27 0.44
Mean 115.19 75.25 7.79 101.70 8.46 142.71 427.97 27.52 0.27 0.53
  1. Al ox oxalate extractable Al, Fe ox oxalate extractable P ox oxlate extractable P, PSC phosphorous sorption capacity, DPS P saturation with respect to Pox, Al d dithionite extractable Al, Fe d dithionite extractable Fe