Fig. 1. Microbial activity in the soil and soil amended with different fertilizers. The activity was estimated by the
fluorescein di-acetate hydrolysis assay (FDA). CK is the
untreated soil; CF is the soil treated with inorganic nitrogen; CP is the soil treated with manure-based compost. Error bars represent the standard error of the mean and
different letters indicate statistically different numbers between treatments (p < 0.05).