Environmental Systems Research

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	K_f	N	RMSE	r²	SPR_f(o.2)	PBC_f(0.2)	Q_max	K_L	RMSE	r²	SPR_L(0.2)	PBC_L(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

K_f amount of P adsorbed, N slope, RMSE root mean square error, SPR_f standard P requirement from Freundlich model, PBS_f phosphorous buffering capacity from Freundlich model, Q_max maximum adsorption, K_L affinity coefficient, SPR standared P requiremnts, PBC phosphorous buffering capacity, MBC maximum buffering capacity

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