Size of the soil microbial biomass in a long-term field experiment as affected by different n-fertilizers and organic manures

Witter, E.; Mårtensson, A.M. and Garcia, F.V. 1993. Size of the soil microbial biomass in a long-term field experiment as affected by different n-fertilizers and organic manures. Soil Biology and Biochemistry, Volume 25 no. 6 p. 659-669