University of Illinois Urbana-Champaign

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Showing 31–60 of 612 items
Thumbnail for Alfalfa on Illinois soil
Alfalfa on Illinois soil
Hopkins, Cyril G.

Thumbnail for The sugar beet in illinois
The sugar beet in illinois
Holden, Perry G.; Hopkins, Cyril G.

Thumbnail for Sources of fertilizing materials for Illinois farms
Sources of fertilizing materials for Illinois farms
Hopkins, Cyril G.; Bauer, Frederick Charles

Thumbnail for Potassium from the soil
Potassium from the soil
Hopkins, Cyril G.; Aumer, Joseph P.

Thumbnail for Methods of corn breeding
Methods of corn breeding
Hopkins, Cyril G.

Thumbnail for Results of scientific soil treatment Part II
Results of scientific soil treatment Part II
Mann, Frank I.; Hopkins, Cyril G.

Thumbnail for Soil treatment for the Lower Illinois Glaciation
Soil treatment for the Lower Illinois Glaciation
Hopkins, Cyril G.; Readhimer, Jerome Edward

Thumbnail for Collecting and testing soil samples
Collecting and testing soil samples
Hopkins, Cyril G.; Pettit, James Harvey

Thumbnail for Soil bacteria and phosphates
Soil bacteria and phosphates
Hopkins, Cyril G.; Whiting, Albert Lemuel

Thumbnail for The fertility in Illinois Soils
The fertility in Illinois Soils
Hopkins, Cyril G.; Pettit, James Harvey

Thumbnail for
"The ""gist"" of four years' soil investigation in the Illinois corn belt"
Hopkins, Cyril G.; Readhimer, J.E.; Pettit, James H.

Thumbnail for
"The ""gist"" of four years' soil investigation in the Illinois wheat belt"
Hopkins, Cyril G.; Pettit, James Harvey; Readhimer, J.E.

Thumbnail for Corn experiments in Illinois : report of progress
Corn experiments in Illinois : report of progress
Hopkins, Cyril G.; Shamel, A.D.; Smith, Louie Henrie

Thumbnail for Directions for the breeding of corn, including methods for the prevention of in-breeding
Directions for the breeding of corn, including methods for the prevention of in-breeding
Hopkins, Cyril G.; East, Edward Murray; Smith, Louie Henrie

Thumbnail for
"Peaty swamp lands : sand and ""alkali"" soils"
Hopkins, Cyril G.; Fisher, Ora Stanley; Readhimer, Jerome Edward