TABLE 3.

Integrated effect of biochar and nitrogen application on chemical properties of soil during 2020–2021.

Biochar	Nitrogen	Soil pH	SOC (g kg–1)	NO3– (mg kg–1)	NH${}_4^{+}$ (mg kg–1)	TP (g kg–1)	AK (mg kg–1)
B0	N0	6.79 g	4.78 e	14.24 i	5.68 h	0.36	114.56 f
	N75	6.80 g	4.67 e	14.56 i	6.21 gh	0.40 g	118.76 f
	N225	6.88 f	4.60 e	18.69 gh	8.53 def	0.40 g	116.66 f
	N450	6.82 g	4.49 e	26.41 d	9.58 cd	0.44 ef	114.97 f
B15	N0	7.24 e	9.19 d	16.58 hi	6.73 gh	0.42 fg	141.67 de
	N75	7.25 de	10.11 d	19.53 fg	7.12 fgh	0.42 fg	136.85 e
	N225	7.27 de	9.15 d	26.91 cd	8.94 cde	0.45 ef	142.95 d
	N450	7.24 e	10.46 d	31.15 b	12.28 b	0.46 e	143.96 d
B30	N0	7.29 bcde	13.53 c	16.36 hi	6.01 h	0.47 e	166.10 c
	N75	7.30 bcd	13.83 c	22.41 e	7.05 fgh	0.50 d	172.42 b
	N225	7.29 bcde	13.51 c	26.58 d	10.35 c	0.54 b	169.52 bc
	N450	7.28 cde	14.48 c	34.11 a	14.75 a	0.54 b	167.36 bc
B60	N0	7.34 ab	17.75 b	15.74 i	5.67 h	0.51 bcd	185.54 a
	N75	7.33 abc	18.23 ab	21.95 ef	6.98 gh	0.53 bc	190.05 a
	N225	7.36 a	19.52 a	24.59 de	7.63 efg	0.57 a	188.33 a
	N450	7.34 ab	19.46 a	29.48 bc	12.06 b	0.58 a	186.15 a
F-values and significance level
Biochar		568.52***	531.67***	33.60***	11.43**	199.14***	977.74***
Nitrogen		2.74 ns	2.06 ns	171.41***	110.56***	35.84***	1.43 ns
Biochar × Nitrogen	1.00 ns	1.09 ns	2.97*	3.79*	1.52 ns	1.65 ns

B0, 0 t ha^–1 biochar; B15, 15 t ha^–1 biochar; B30, 30 t ha^–1 biochar; B60, 60 t ha^–1 biochar; N0, 0 kg ha^–1 nitrogen; N150, 150 kg ha^–1 nitrogen; N300, 300 kg ha^–1 nitrogen, and N450, 450 kg ha^–1 nitrogen. SOC, soil organic carbon; NO${}_3^{-}$-N, nitrate nitrogen; NH${}_4^{+}$-N, ammonium nitrogen; TP, total phosphorus and AK, available potassium. Different letters within the columns show a significant difference between the treatments at p = 0.05 according to the LSD test, and asterisks represent a significant difference at *p < 0.05, **p < 0.01, and ***p < 0.001 level; ns, not-significant.