Examining the Effect of Combined Biochar and Lime Rates on Selected Soil Physicochemical Properties of Acid Soils in Gimbi District, Western Ethiopia

Table 4

Effect of coffee husk biochar (CHB) and/or soil test value-based lime (STV) rates on pH, SOC, TN, and available P of acid soils.

Factor ha^−1	pH (H2O)	SOC (%)	SOM (%)	TN (%)	C/N (%)	Available P (mg·kg^−1)
Farm-1
Control	5.10^e	1.52^h	2.63^h	0.63^e	2.23^e	2.19^d
100% of STV	5.60^d	2.39^g	4.13^g	0.46^f	5.17^b	2.19^d
10 ton of CHB	6.11^a	6.37^b	10.99^b	1.40^d	4.55^c	2.81^c
10 ton of CHB + 75% of STV	5.98^b	7.44^a	12.83^a	1.68^b	4.43^c	4.86^a
10 ton of CHB + 50% of STV	6.09^a	6.15^c	10.61^c	0.73^e	8.46^a	3.61^b
7.5 ton of CHB + 75% of STV	5.89^c	4.48^d	7.72^d	1.50^c	2.98^d	3.81^b
7.5 ton of CHB + 50% of STV	5.93^bc	3.66^e	6.31^e	1.86^a	1.96^e	3.59^b
5 ton of CHB + 75% of STV	5.58^d	3.03^f	5.23^f	1.55^c	1.95^e	2.75^c
CV (%)	0.57	1.40	1.39	3.99	6.07	4.04
LSD (0.05)	0.05	0.10	0.18	0.08	0.45	0.22
Farm-2
Control	4.64^e	1.02^h	1.76^h	0.27^d	3.75^d	2.81^g
100% of STV	6.08^b	3.00^g	5.17^g	0.46^d	6.46^bc	6.08^b
10 ton of CHB	6.22^a	5.59^c	9.63^c	0.97^c	5.72^c	4.08^f
10 ton of CHB + 75% of STV	6.02^b	7.68^a	13.24^a	2.11^a	3.68^d	6.96^a
10 ton of CHB + 50% of STV	6.04^b	6.31^b	10.88^b	0.84^c	7.47^b	4.71^d
7.5 ton of CHB + 75% of STV	5.51^d	5.04^e	8.69^e	1.31^b	3.84^d	5.53^c
7.5 ton of CHB + 50% of STV	5.74^c	4.38^d	7.39^f	0.40^d	10.78^a	4.88^d
5 ton of CHB + 75% of STV	5.48^d	5.43^d	9.36^d	1.30^b	4.15^d	4.37^e
CV (%)	1.01	1.64	1.64	0.97	11.98	2.92
LSD (0.05)	0.10	0.13	0.23	0.20	1.20	0.25

pH: potential of hydrogen, SOC: soil organic carbon, TN: total nitrogen, C/N: carbon-to-nitrogen ratio, P: phosphorous, ns: non-significant, : significant (), and : highly significant ().