Table 2 Significance of the effects of irrigation methods, nitrogen fertilization levels, bio-char levels and their interactions on maize growth and yield using ANOVA.

Year	Source	SOD activity (U mg^-1)	POD activity (μ g⁻¹ min⁻¹)	MDA content (μmol g⁻¹)	Dry matter in R1 (g plant⁻¹)	Dry matter in R6 (g plant⁻¹)	Yield (kg h⁻¹ m⁻²)
2019	I	290,164.16**	70,886.58**	9.60**	70,699.28**	208,532.59**	10,097,100.5**
	N	6107.70**	5892.70**	0.73**	20,169.25**	36,629.26**	10,393,276.3**
	B	4855.22**	1208.81**	0.44**	7946.72**	9950.65**	7,380,317.5**
	I*N	948.53**	320.23**	0.64**	1895.76**	3.07 ns	45,308.0 ns
	I*B	1486.48**	133.95*	0.04**	467.99**	190.79 ns	348,143.1*
	N*B	323.26 ns	46.77 ns	0.02**	297.16*	192.56 ns	154,434.3 ns
	INB	256.61 ns	62.31 ns	0.03**	32.77 ns	272.11 ns	53,392.3 ns
2020	I	397,884.12**	69,708.33**	7.03**	87,983.62**	228,038.68**	131,641,538.0**
	N	14,928.20**	5084.57**	0.90**	29,624.76**	41,972.59**	11,665,380.5**
	B	6027.17**	1090.46**	0.34**	7807.38**	9053.22**	7,129,577.7**
	I*N	785.32 ns	47.20 ns	0.30**	901.68**	351.13 ns	1,137,105.8**
	I*B	737.31*	181.47**	0.16**	731.83**	178.31 ns	221,938.0 ns
	N*B	81.50 ns	47.19 ns	0.01 ns	70.41 ns	198.04 ns	29,515.3 ns
	INB	89.10 ns	25.03 ns	0.01 ns	26.93 ns	180.49 ns	26,164.0 ns

Numbers were F values. Stars indicated the level of significance (*p < 0.05, **p < 0.01), ns represented insignificant. I represented irrigation methods, including RI and DS; N represented nitrogen fertilization levels, including N0, N150,N300; B represented bio-char levels, including C0,C8,C16,C24.

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