Fig. 5 Microbial biomass N in 0–5 cm soil layer of cores treated with 15N-labeled KNO3 (upper panel), rye (middle panel) or manure (lower panel), and incubated with or without worms. Asterisks and error bars are as for Fig. 1
Fig. 5 Microbial biomass N in 0–5 cm soil layer of cores treated with 15N-labeled KNO3 (upper panel), rye (middle panel) or manure (lower panel), and incubated with or without worms. Asterisks and error bars are as for Fig. 1