Phosphorus Status, Inorganic Phosphorus Forms, and Other Physicochemical Properties of Acid Soils of Farta District, Northwestern Highlands of Ethiopia

Table 7

Olsen P, oxalate extractable Al, Fe, and P, and citrate dithionite bicarbonate extractable Al and Fe.

Sampling site	Olsen P (mg kg^−1)	Alox	Feox	Pox	PSC				Ald	Fed	Feox/Fed
		(mmol kg^−1)				DPS (%)			(mmol kg^−1)
Ayermarefiya	3.1	137	63	6.1	200	0.49	8.3	3.1	159	562	0.11
Abalomeda	2.3	164	78	5.3	242	0.33	6.3	2.2	192	650	0.12
Kumbelie	7.0	137	83	7.6	220	0.58	6.1	3.5	95	359	0.23
Korekonch	6.2	156	80	10.3	236	0.68	8.5	4.4	165	415	0.19
Agawer I	2.0	177	70	5.4	246	0.36	7.0	2.2	179	629	0.11
Agawer II	3.8	137	89	4.5	226	0.36	7.1	2.0	148	639	0.14
Jura I	6.2	165	67	9.9	232	0.74	7.8	4.3	138	463	0.14
Jura II	24.3	176	97	17.5	274	1.61	14.2	6.4	101	380	0.26
Mean	6.9	156	78	8.3	234	0.64	8.5	3.5	147	512	0.16

Al_ox, Fe_ox, and P_ox = oxalate extractable Al, Fe, and P, respectively; PSC = P sorption capacity; DPS = degree of P saturation; a and b = degree of P saturation of the Al-P and Fe-P with respect to Al_ox and Fe_ox; Al_d and Fe_d = dithionite citrate bicarbonate extractable Al and Fe, respectively; c = degree of P saturation of P_ox with respect to P sorption capacity.