Table 3.

Impact of various combinations of biochar and nitrogen fertilizer on soil enzymatic activities.

Experimental site	Treatments	S-UE [mg/(d·g)]	S-ACP [umol/(d·g)]	S-CAT [umol/(min·g)]	S-SC [mg/(d·g)]
Pot experiment	B0N105	0.90 ± 0.03c	1.07 ± 0.04c	14.00 ± 0.68c	7.42 ± 0.47d
	B600N105	1.16 ± 0.04b	1.50 ± 0.04a	15.59 ± 0.72b	10.33 ± 0.47c
	B1200N105	0.88 ± 0.04c	1.28 ± 0.05b	12.02 ± 0.75d	5.85 ± 0.46e
	B0N126	0.96 ± 0.05c	1.11 ± 0.02c	13.80 ± 0.21c	7.70 ± 0.55d
	B600N126	1.23 ± 0.06b	1.54 ± 0.05a	16.78 ± 0.43a	11.10 ± 0.13b
	B1200N126	1.38 ± 0.08a	1.52 ± 0.06a	16.91 ± 0.51a	12.23 ± 0.34a
Field experiment	B0N105	0.59 ± 0.03d	0.31 ± 0.06c	11.56 ± 0.31a	4.89 ± 0.38b
	B600N105	0.82 ± 0.04c	0.67 ± 0.01a	11.90 ± 0.73a	7.64 ± 0.57a
	B1200N105	0.64 ± 0.05d	0.44 ± 0.05b	11.66 ± 0.32a	3.44 ± 0.20c
	B0N126	0.62 ± 0.04d	0.45 ± 0.03b	11.89 ± 0.48a	5.30 ± 0.81b
	B600N126	0.94 ± 0.02b	0.70 ± 0.07a	12.15 ± 0.36a	7.32 ± 0.31a
	B1200N126	1.10 ± 0.03a	0.72 ± 0.09a	11.96 ± 0.79a	7.50 ± 0.48a

Urease (UE), Acid phosphatase (ACP), Catalase (CAT), and Sucrase (SC). B0, B600, and B1200 represent 0, 600, and 1800 kg/ha biochar application rates, respectively. N105 and N126 represent 105 and 126 kg/ha application rates of pure nitrogen, respectively. The significant difference among treatments after specific days of post-transplantation is shown by different lowercase letters within a column according to the least significant difference test (LSD; p < 0.05).