Table 2.

Impact of irrigation regimes and different exogenously applied substances on the antioxidant enzymatic activity of diverse rice genotypes over two summer seasons of 2021 and 2022.

Studied Factor		Catalase (Unit mg/protein)	Peroxidase (Unit mg/protein)	Proline content (μmol g/DW)
Irrigation
Well-watered		0.638 b	1.58 b	0.505 b
Drought stress		0.817 a	1.93 a	0.977 a
Foliar application
Untreated control		0.627 d	1.49 c	0.552 c
Nano-silicon		0.847 a	1.97 a	0.799 ab
Potassium sulfate		0.685 c	1.76 b	0.772 b
Proline		0.752 b	1.80 b	0.842 a
Genotypes
IRRAT		0.674 b	1.70 b	0.623 c
G178		0.792 a	1.85 a	0.835 a
IR64		0.717 ab	1.71 b	0.765 b
ANOVA	df	P value
Irrigation (IR)	1	<0.001	<0.001	<0.001
Foliar application (FA)	3	<0.001	<0.001	<0.001
Genotype (G)	2	<0.001	<0.001	<0.001
Year (Y)	1	0.052	0.402	0.059
IR × FA	3	<0.001	<0.001	<0.001
IR × G	2	<0.001	<0.001	<0.001
IR × Y	1	0.093	0.267	0.402
FA × G	6	<0.001	<0.001	<0.001
FA × Y	3	0.059	0.046	0.267
G × Y	2	0.076	0.057	0.065
IR × FA × G	6	<0.001	<0.001	<0.001
IR × FA × G × Y	3	0.771	0.608	0.608