University of Illinois Urbana-Champaign

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Showing 1–30 of 612 items
Thumbnail for How Greece can produce more food
How Greece can produce more food
Hopkins, Cyril G.

Thumbnail for A limestone tester
A limestone tester
Hopkins, Cyril G.

Thumbnail for A new limestone tester
A new limestone tester
Hopkins, Cyril G.

Thumbnail for
"1919 yields from ten wheat fields in ""Egypt"""
Hopkins, Cyril G.

Thumbnail for Illinois crop yields from soil experiment fields
Illinois crop yields from soil experiment fields
Hopkins, Cyril G.

Thumbnail for
"Soil treatment for peaty swamp lands, including reference to sand and ""alkali"" soils"
Hopkins, Cyril G.

Thumbnail for Bread from stones
Bread from stones
Hopkins, Cyril G.

Thumbnail for Essentials in large food production
Essentials in large food production
Hopkins, Cyril G.

Thumbnail for Present status of soil investigation
Present status of soil investigation
Hopkins, Cyril G.

Thumbnail for Why Illinois produces only half a crop
Why Illinois produces only half a crop
Hopkins, Cyril G.

Thumbnail for How not to treat Illinois soils
How not to treat Illinois soils
Hopkins, Cyril G.

Thumbnail for The Illinois system of permanent soil fertility as developed by Cyril G. Hopkins
The Illinois system of permanent soil fertility as developed by Cyril G. Hopkins
Stewart, Robert

Thumbnail for A phosphate problem for Illinois landowners
A phosphate problem for Illinois landowners
Hopkins, Cyril G.

Thumbnail for The duty of chemistry to agriculture
The duty of chemistry to agriculture
Hopkins, Cyril G.

Thumbnail for
"Shall we use ""complete"" commercial fertilizers in the corn belt?"
Hopkins, Cyril G.

Thumbnail for Illinois wheat yields with nature's fertilizers / 229
Illinois wheat yields with nature's fertilizers / 229
Hopkins, Cyril G.

Thumbnail for European practice and American theory concerning soil fertility
European practice and American theory concerning soil fertility
Hopkins, Cyril G.

Thumbnail for Chemical principles of soil fertility
Chemical principles of soil fertility
Hopkins, Cyril G.

Thumbnail for Soil fertility : Illinois conditions, needs, and future prospects.
Soil fertility : Illinois conditions, needs, and future prospects.
Hopkins, Cyril G.

Thumbnail for Factors in crop production with special reference to permanent agriculture in Illinois
Factors in crop production with special reference to permanent agriculture in Illinois
Hopkins, Cyril G.

Thumbnail for Shall we use natural rock phosphate or manufactured acid phospate for the permanent improvement of Illinois soils?
Shall we use natural rock phosphate or manufactured acid phospate for the permanent improvement of Illinois soils?
Hopkins, Cyril G.

Thumbnail for Soil treatment for wheat in rotations, with special reference to southern Illinois soils
Soil treatment for wheat in rotations, with special reference to southern Illinois soils
Hopkins, Cyril G.

Thumbnail for Composition and digestibility of corn ensilage, cowpea ensilage, soja bean ensilage, and corn-fodder
Composition and digestibility of corn ensilage, cowpea ensilage, soja bean ensilage, and corn-fodder
Hopkins, Cyril G.

Thumbnail for Illinois soils in relation to systems of permanent agriculture
Illinois soils in relation to systems of permanent agriculture
Hopkins, Cyril G.

Thumbnail for Science and sense in the inoculation of legumes
Science and sense in the inoculation of legumes
Hopkins, Cyril G.

Thumbnail for Nitrogen bacteria and legumes : with special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils
Nitrogen bacteria and legumes : with special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils
Hopkins, Cyril G.

Thumbnail for Methods of maintaining the productive capacity of Illinois soils
Methods of maintaining the productive capacity of Illinois soils
Hopkins, Cyril G.

Thumbnail for The story of a king and queen
The story of a king and queen
Hopkins, Cyril G.

Thumbnail for Phosphorus and humus in relation to Illinois soils
Phosphorus and humus in relation to Illinois soils
Hopkins, Cyril G.

Thumbnail for Ground limestone for acid soils
Ground limestone for acid soils
Hopkins, Cyril G.