International Scholarly Research Notices / 2012 / Article / Tab 4

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.

TreatmentpHExchangeable acidity (cmol kg−1)Exchangeable Al (cmol kg−1)
4 WAI16 WAIΔ pH4 WAI16 WAIΔ ex. acidity4 WAI16 WAIΔ ex. Al

(1) Control4.634.24−0.390.890.87−0.020.630.62−0.01
(2) Tithonia (60 kg P ha−1)5.434.28−1.150.310.48 0.170.160.17 0.01
(3) FYM (60 kg P ha−1)4.784.26−0.520.660.77 0.110.420.49 0.07
(4) MPR (60 kg P ha−1)4.844.31−0.530.680.81 0.130.450.61 0.16
(5) TSP (60 kg P ha−1)4.684.25−0.430.790.84 0.050.670.59−0.08
(6) BPR (60 kg P ha−1)4.764.28−0.480.910.83−0.080.540.61 0.07
(7) Tithonia (20 kg P ha−1) + MPR (40 kg P ha−1)5.674.38−1.290.520.61 0.090.210.37 0.16
(8) Tithonia (20 kg P ha−1) + (TSP 40 kg P ha−1)5.394.44−0.960.530.65 0.120.250.47 0.22
(9) Tithonia (20 kg P ha−1) + BPR (40 kg P ha−1)5.254.28−0.970.410.65 0.240.210.53 0.32
(10) FYM (20 kg P ha−1) + MPR (40 kg P ha−1)4.844.25−0.590.610.79 0.180.410.60 0.19
(11) FYM (20 kg P ha−1) + TSP (40 kg P ha−1)4.814.18−0.630.770.79 0.020.470.65 0.18
(12) FYM (20 kg P ha−1) + BPR (40 kg P ha−1)4.724.28−0.440.770.83 0.060.550.65 0.10
(13) Tithonia (20 kg P ha−1)4.754.23−0.520.660.82 0.160.320.55 0.23
(14) FYM (20 kg P ha−1)4.764.29−0.470.710.83 0.120.480.65 0.17
(15) MPR (40 kg P ha−1)4.824.35−0.470.730.81 0.080.470.60 0.13
(16) TSP (40 kg P ha−1)4.734.18−0.550.830.90 0.070.570.71 0.14
(17) BPR (40 kg P ha−1)4.704.17−0.530.840.95 0.110.580.68 0.10
SED0.14N.S.0.110.070.10 0.07
CV %3.5018.911.527.511.50

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.

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