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4865. Noll, C.F.. 1915. Effect of fertilizers on soil structure as indicated by the draft requirement for tillage.. Pennsylvania Agr. Expt. Sta. Annual Report 1913-1914. Part II, p.36-46.
Rotation plots since 1882 (C-O-W-clover), with and without lime, fertilizer trts; Hagerstown silt loam; used a dynamometer; no difference between manure and commercial fertilizer; draft inversely related to organic matter levels. T: draft vs. SOM.