International Scholarly Research Notices / 2012 / Article / Tab 6

Research Article

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

Table 6

Effect of organic and inorganic P amendments on Olsen P (mg P kg−1) at Bukura and Kakamega in the laboratory incubation study.

TreatmentBukuraKakamega
4 WAI16 WAIΔ Olsen P4 WAI16 WAIΔ Olsen P

(1) Control 7.3 8.9 1.63.2 4.3 1.1
(2) Tithonia (60 kg P ha−1)13.114.7 1.68.2 9.6 1.4
(3) FYM (60 kg P ha−1)16.016.5 0.59.510.0 0.5
(4) MPR (60 kg P ha−1)13.416.3 2.96.9 8.0 1.1
(5) TSP (60 kg P ha−1)18.217.7 −0.59.810.1 0.3
(6) BPR (60 kg P ha−1)11.011.5 0.54.5 6.0 1.5
(7) Tithonia (20 kg P ha−1) + MPR (40 kg P ha−1)14.113.9 −0.27.9 6.3 −1.6
(8) Tithonia (20 kg P ha−1) + (TSP 40 kg P ha−1)17.415.8 −1.68.9 8.6 −0.3
(9) Tithonia (20 kg P ha−1) + BPR (40 kg P ha−1)12.412.6 0.24.4 5.1 0.7
(10) FYM (20 kg P ha−1) + MPR (40 kg P ha−1)15.015.7 0.77.4 9.3 1.9
(11) FYM (20 kg P ha−1) + TSP (40 kg P ha−1)14.517.7 3.28.0 6.0 −2.0
(12) FYM (20 kg P ha−1) + BPR (40 kg P ha−1)13.116.1 3.05.9 5.8 −0.1
(13) Tithonia (20 kg P ha−1)11.213.9 2.74.6 7.3 2.7
(14) FYM (20 kg P ha−1)12.715.6 2.95.7 7.5 1.8
(15) MPR (40 kg P ha−1)12.514.9 2.46.3 6.6 0.3
(16) TSP (40 kg P ha−1)14.216.6 2.46.7 7.3 0.6
(17) BPR (40 kg P ha−1) 9.8 9.6 −0.24.4 5.6 1.2
SED 0.9 1.3 0.7 0.7
CV % 9 111010

WAI: weeks after incubation; FYM: farmyard manure; TSP: triple superphosphate; MPR: Minjingu phosphate rock;
BPR: Busumbu phosphate rock; SED: standard error of difference between means.

Article of the Year Award: Outstanding research contributions of 2020, as selected by our Chief Editors. Read the winning articles.