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1549. Dawson, R.C., V.T. Dawson, and T.M. McCalla. 1948. Distribution of microorganisms in the soil as affected by plowing and subtilling crop residues.. NE Agr. Expt. Sta. Research Bull. 155.
Study in Nebraska on distribution of organisms in 0-1 and 1-6 inch depths. Top inch contained greater numbers where residues were subtilled, lower depth when residues were plowed. Effect usually disappeared 9 months after application. Microbial numbers varied with sampling date. Higher residue rates stimulated higher microbial numbers. No evidence of selective stimulation of specific microbial groups.