Improving Phosphorus Availability in an Acid Soil Using Organic Amendments Produced from Agroindustrial Wastes

Table 3

Mean square values of analysis of variance (ANOVA) to evaluate the effects of treatments and time on the soil pH, exchangeable acidity, exchangeable Al, exchangeable Fe, and exchangeable Ca.

Source of variations	Degree of freedom	Mean square
		pH	Exchangeable acidity	Exchangeable Al	Exchangeable Fe	Exchangeable Ca
Treatments	4	3.71*	0.23*	0.08*	9.03*	70.70*
Time	2	0.65*	0.15*	0.01*	0.37*	0.52*
Treatments * time	8	0.76*	0.34*	0.01*	0.14*	0.24*
Error	30

Note: ∗indicates significant at 𝑃≤0.05.