Characteristics of humus and coprolites of eathworms in agro-soddy podzolic soils

It has been experimentally established that coprolites of earthworms have an increased content of carbon (33-51%) and nitrogen (3-50%) as compared to the surrounding soil. However, both Cha and Cfa are extracted by alkaline and pyrophosphate-alkaline fractions from coprolites to a lesser extent. Probably, it is conditioned by specific character of humus substances in coprolites and their connection with the mineral part of the soil.