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

Environmental Systems Research

Table 6 Inorganic and organic P fractions and their distribution

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

NH₄Cl-P ammonium extractable P, NaHCO₃-Pi sodium bicarbonate extractable inorganic P, NaHCO₃-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