Fig. 1. Phosphorus availability in different combinations of fly ash (FA) and cow dung (CD) treated with (E) and without (E0) earthworms after 40 and 50 d of incubation (values indicate mean ± standard error, n = 3).
Fig. 1. Phosphorus availability in different combinations of fly ash (FA) and cow dung (CD) treated with (E) and without (E0) earthworms after 40 and 50 d of incubation (values indicate mean ± standard error, n = 3).