Changes in biochemical properties of cow manure during processing by earthworms (Eisenia andrei, Bouché) and the effects on seedling growth

摘要: Summary The biochemical changes in fresh cow manure caused by the earthworm Eisenia andrei (Bouche) were measured over a period of four months, under controlled laboratory conditions. Earthworms introduced into each plastic containers (0.4 × 0.27 0.15 m) containing (2500 g), and but without earthworms served as controls. reduced pH decreased moisture content manure. C:N ratio with or progressively from 36 to 21. ash total nitrogen contents increased greatly for few weeks after introduction earthworms, reflecting rapid breakdown carbon compounds mineralization earthworms. CO2 evolution rapidly (44%) one week continued at lower rate throughout 17 (51% reduction compared 22% earthworms), indicating increasing stability organic matter. microbial biomass early process, enhanced rates conversion ammonium-nitrogen nitrate. major general effect on wastes was accelerate maturation demonstrated growth lettuce tomato seedlings.