International Scholarly Research Notices

Research Article

Effects of Organic and Inorganic Materials on Soil Acidity and Phosphorus Availability in a Soil Incubation Study

Table 4

Effect of organic and inorganic materials on soil pH, exchangeable acidity and exchangeable Al for the Bukura soils in the incubation study.


Treatment	pH			Exchangeable acidity (cmol kg⁻¹)			Exchangeable Al (cmol kg⁻¹)
Treatment	4 WAI	16 WAI	Δ pH	4 WAI	16 WAI	Δ ex. acidity	4 WAI	16 WAI	Δ ex. Al

(1) Control	4.63	4.24	−0.39	0.89	0.87	−0.02	0.63	0.62	−0.01
(2) Tithonia (60 kg P ha⁻¹)	5.43	4.28	−1.15	0.31	0.48	0.17	0.16	0.17	0.01
(3) FYM (60 kg P ha⁻¹)	4.78	4.26	−0.52	0.66	0.77	0.11	0.42	0.49	0.07
(4) MPR (60 kg P ha⁻¹)	4.84	4.31	−0.53	0.68	0.81	0.13	0.45	0.61	0.16
(5) TSP (60 kg P ha⁻¹)	4.68	4.25	−0.43	0.79	0.84	0.05	0.67	0.59	−0.08
(6) BPR (60 kg P ha⁻¹)	4.76	4.28	−0.48	0.91	0.83	−0.08	0.54	0.61	0.07
(7) Tithonia (20 kg P ha⁻¹) + MPR (40 kg P ha⁻¹)	5.67	4.38	−1.29	0.52	0.61	0.09	0.21	0.37	0.16
(8) Tithonia (20 kg P ha⁻¹) + (TSP 40 kg P ha⁻¹)	5.39	4.44	−0.96	0.53	0.65	0.12	0.25	0.47	0.22
(9) Tithonia (20 kg P ha⁻¹) + BPR (40 kg P ha⁻¹)	5.25	4.28	−0.97	0.41	0.65	0.24	0.21	0.53	0.32
(10) FYM (20 kg P ha⁻¹) + MPR (40 kg P ha⁻¹)	4.84	4.25	−0.59	0.61	0.79	0.18	0.41	0.60	0.19
(11) FYM (20 kg P ha⁻¹) + TSP (40 kg P ha⁻¹)	4.81	4.18	−0.63	0.77	0.79	0.02	0.47	0.65	0.18
(12) FYM (20 kg P ha⁻¹) + BPR (40 kg P ha⁻¹)	4.72	4.28	−0.44	0.77	0.83	0.06	0.55	0.65	0.10
(13) Tithonia (20 kg P ha⁻¹)	4.75	4.23	−0.52	0.66	0.82	0.16	0.32	0.55	0.23
(14) FYM (20 kg P ha⁻¹)	4.76	4.29	−0.47	0.71	0.83	0.12	0.48	0.65	0.17
(15) MPR (40 kg P ha⁻¹)	4.82	4.35	−0.47	0.73	0.81	0.08	0.47	0.60	0.13
(16) TSP (40 kg P ha⁻¹)	4.73	4.18	−0.55	0.83	0.90	0.07	0.57	0.71	0.14
(17) BPR (40 kg P ha⁻¹)	4.70	4.17	−0.53	0.84	0.95	0.11	0.58	0.68	0.10
SED	0.14	N.S.		0.11	0.07		0.10	0.07
CV %	3.50			18.9	11.5		27.5	11.50

WAI: weeks after incubation; FYM: farmyard manure; TSP: triple superphosphate; MPR: Minjingu phosphate rock; BPR: Busumbu phosphate rock; N.S.: not significant; SED: standard error of difference between means; Ex: exchangeable.