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Table 3 The Freundlich and Langmuir model parameters, SPR, PBC, MBC, RMSE and r2 values after 24 h equilibration period

From: Phosphorous status and adsorption characteristics of acid soils from Cheha and Dinsho districts, southern highlands of Ethiopia

Sampling Freundlich parameters Langmuir parameters
Sites Kf N RMSE r2 SPRf(o.2) PBCf(0.2) Qmax KL RMSE r2 SPRL(0.2) PBCL(0.2) MBC(0.2)
SC1 315.31 0.44 1.52 0.99 154.02 342.82 680.27 1.13 56.91 0.96 125.47 769.23 627.35
SC2 240.41 0.48 2.38 0.99 110.95 266.54 781.25 0.45 32.66 0.99 65.02 354.61 298.04
SC3 264.75 0.46 2.11 0.99 126.39 290.33 746.27 0.61 29.88 0.99 81.69 458.71 363.77
SC4 250.14 0.47 2.25 0.99 117.91 275.49 763.36 0.52 35.53 0.99 71.63 395.26 324.56
SC5 218.95 0.49 2.78 0.99 98.37 244.51 833.33 0.33 28.07 0.99 51.28 273.22 240.63
SC6 212.14 0.50 2.93 0.99 94.04 237.67 884.96 0.28 21.27 0.99 46.34 244.49 219.56
SC7 227.07 0.48 2.59 0.99 104.44 251.99 769.23 0.41 30.74 0.99 58.31 315.46 269.44
SD1 203.71 0.54 3.44 0.99 85.23 230.71 1112.11 0.19 18.22 0.98 39.92 207.04 192.43
SD2 213.51 0.50 3.01 0.99 95.33 238.81 847.46 0.29 33.44 0.98 46.99 248.76 221.93
SD3 124.37 0.55 6.43 0.99 50.85 141.29 943.39 0.09 14.88 0.97 17.69 90.17 86.82
SD4 202.04 0.53 3.23 0.99 86.13 228.14 925.93 0.24 19.61 0.98 42.05 220.26 200.71
SD5 123.32 0.55 5.88 0.99 50.50 140.06 869.56 0.11 12.39 0.98 18.62 95.15 91.11
Mean 216.31 0.502 3.21 0.99 97.85 240.69 846.34 0.39 27.80 0.98 55.42 306.03 261.36
  1. Kf amount of P adsorbed, N slope, RMSE root mean square error, SPRf standard P requirement from Freundlich model, PBSf phosphorous buffering capacity from Freundlich model, Qmax maximum adsorption, KL affinity coefficient, SPR standared P requiremnts, PBC phosphorous buffering capacity, MBC maximum buffering capacity