Table 3.

Summary of the analysis of variance for root dry mass (RDM), stem dry mass (SDM), leaf dry mass (LDM), and total dry mass (TDM) of cotton plants subjected to irrigation water salinity and hydrogen peroxide concentrations at 130 days after sowing.

Variation Sources	DF	Mean Squares
		RDM	SDM	LDM	TDM
Salinity levels (SL)	4	143.38 **	719.95 **	179.04 **	2648.41 **
Linear regression	1	522.59 **	2597.33 **	584.54 **	9998.61 **
Quadratic regression	1	49.23 **	168.69 **	2.96 ns	334.50 **
Hydrogen peroxide (H2O2)	4	1.94 **	29.45 **	5.94 **	57.99 **
Linear regression	1	2.50 *	0.47 ns	0.019 ns	5.80 ns
Quadratic regression	1	2.46 *	15.01 **	9.87 ns	5.31 ns
Interaction (SL × H2O2)	16	2.90 **	13.01 **	5.08 **	29.89 **
Blocks	2	0.16 ns	2.09 ns	0.16 ns	4.23 ns
Residual	74	0.48	1.07	1.17	3.61
CV (%)		12.1	7.79	13.7	7.06

** significant at p ≤ 0.01; * significant at p ≤ 0.05; ^ns not significant.