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Table 6 Inorganic and organic P fractions and their distribution

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

Sites NH4Cl-Pi NaHCO3-Pi NaHCO3-Po NaOH-Pi (mg kg−1) NaOH-Po (NaOH-Pi)sn (NaOH-Po)sn HCl-P Resl-P Sum ∑P
SC1 1.93 2.43 2.74 135.31 160.41 31.74 35.31 71.32 164.15 606.34
SC2 3.23 3.72 3.91 139.71 196.87 40.93 85.17 86.89 216.25 776.68
SC3 1.69 2.45 2.78 130.45 167.59 33.9 36.28 77.01 185.18 637.33
SC4 2.53 2.06 3.63 129.66 180.82 37.76 76.68 77.88 187.30 698.32
SC5 2.32 2.59 2.97 124.13 168.69 36.33 72.85 75.57 177.55 663.00
SC6 2.59 2.72 4.04 138.82 190.94 44.24 79.32 83.55 213.41 759.63
SC7 2.06 2.11 3.85 131.76 182.48 38.10 77.6 77.95 190.94 706.85
SD1 5.90 7.61 9.35 89.65 154.49 28.28 72.29 379.32 317.24 1064.13
SD2 3.90 5.12 5.63 82.76 144.32 23.42 70.50 354.86 301.16 992.67
SD3 7.40 7.75 8.95 97.37 168.11 30.40 77.76 407.26 340.73 1145.73
SD4 5.90 6.51 6.53 86.63 147.56 27.01 69.03 362.64 303.60 1015.41
SD5 6.90 7.14 7.97 96.12 161.64 31.22 72.71 391.69 324.87 1100.26
Mean 3.86 4.35 5.19 115.20 168.66 33.61 68.79 203.83 243.53 847.20
  1. NH 4 Cl-P ammonium extractable P, NaHCO 3 -Pi sodium bicarbonate extractable inorganic P, NaHCO 3 -Po sodium bicarbonate extractable organic P, NaOH-Pi sodium hydroxide extractable inorganic P, NaOH-po sodium hydroxide extractable organic P, (NaOH-Pi)sn sonicated sodium hydroxide extractable inorganic P, (NaOH-po)sn sonicated sodium hydroxide extractable organic P, HCl-P hydrochloric acid extractable P, ∑P sum of P fractions