Residual effects of corncob biochar on tropical degraded soil in central Uganda

Environmental Systems Research

Table 4 Residual effects of biochar farmyard, compost and/or NPK applications on the soil pH, total soil organic carbon, nitrogen and available phosphorus

Treatment	pH (H₂0)	Av.P (mg/kg)	TOC (%)	N (%)
CTRL	5.35b	5.48f	1.36e	0.07c
CM	5.56ab	6.32e	1.60de	0.10ab
NPK	5.41b	5.54f	1.40e	0.09bc
BC1	5.66ab	6.30e	1.63de	0.11bc
BC2	5.74ab	6.56d	1.88cd	0.12bc
BC1 + CM	5.73ab	7.03b	2.43ab	0.13abc
BC2 + CM	6.23a	7.48a	2.78a	0.18a
BC1 + NPK	5.58ab	6.68c	2.07bc	0.11bc
BC2 + NPK	5.55ab	7.28b	2.39b	0.13abc
Significant^X	NS	***	***	**
SED^Y	0.14	0.15	0.06	0.01

SED^Y and Significant^X effects were obtained from one-way analysis of variance: *, **, ***Significant at P < 0.05, P < 0.01, and P < 0.001, respectively. See Table 2 for a description of the treatments; Means followed by the same letter in each column are not significantly different at p ≤ 0.05 using Tukey HSD