Earthworms had a significant impact on the properties of sewage sludge as shown in Table 2. Comparing the sewage sludge treated with and without earthworms, the pH values were about 0.3 units higher for all application rates of heavy
Earthworms had a significant impact on the properties ofsewage sludge as shown in Table 2. Comparing the sewagesludge treated with and without earthworms, the pH valueswere about 0.3 units higher for all application rates of heavy