Illinois wheat yields with nature's fertilizers
By: by Cyril G. Hopkins ... [et al.].
Series: Circular (University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station) -- no. 229; Circular (University of Illinois (Urbana-Champaign campus). Agricultural Experiment Station) -- no. 229.
Publisher: University of Illinois Agricultural Experiment Station
Published: 1918
Place of publication: Urbana, Ill
Language: eng
Subjects: Wheat; Fertilizers; Crop yields
Notes: Caption title.