The Iowa State University Digital Repository provides open access to the full-text of many theses and dissertations completed at Iowa State University. From this page, you can either browse our theses and dissertations by academic department or by the year of completion.

Some Iowa State theses and dissertations are not eligible for open access. These may be accessible, with some restrictions, via ProQuest/UMI. On the ProQuest site, the full text of Iowa State's digital theses and dissertations can be viewed by members of the Iowa State community (current students, faculty, and staff) or individuals searching from Iowa State campus IP addresses. Others can view only the first 25 pages of a thesis or dissertation from Iowa State

Finally, some Iowa State theses and dissertations exist only in paper format. For more information, see How to find dissertations and theses through the Iowa State University Library, or contact your subject librarian.

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Theses/Dissertations from 1924

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Biochemical effects of gypsum on Iowa soils , Walter Beno Bollen

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Respiration studies of apples in cold storage, William Cecil Calvert

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Studies on the comparative cytology of the annual and biennial varieties of Melilotus alba , Edward F. Castetter

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The effects of various methods of applying fertilizers on crops and certain soil conditions , Dana G. Coe

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A structural and functional study of apple graft unions, Francis M. Coe

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Studies on the relation of Puccinia graminis Per and Puccinia coronata Corda to Avena species , S. M. Dietz

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Transmissibility and pathological effects of the mosaic disease, Otto Herman Elmer

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The nitrogen-metabolism of nitrogen-fixing bacteria, William Vernal Halversen

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Factors influencing the motility of the soybean seedcoat ..., Eugene A. Hollowell

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The stability of iron carbide and calculations of its heat of formation from equilibrium studies , Harold L. Maxwell

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The effect of pressure on the decomposition of potassium chlorate in the presence of manganese dioxide , Henry Max McLaughlin

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The acquisition of food by the honeybee , Oscar Wallace Park

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A study of reactions in liquid hydrogen sulphide , George Norman Quam

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The effects of various cultural conditions on the carbohydrate and nitrogen content of apple fruit spurs, W D. Reineke

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A study of the propagation of greenhouse plants by cuttings, Ralph Rudolph Rothacker

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Temperature and the growth of yeast , Frank F. Sherwood

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The translocation of the food materials of the wheat seedling, L. Edwin Yocum

Theses/Dissertations from 1923

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The distribution of trees along Upper Skunk river, Iowa, Raymond John Becraft

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An appraisal of institutions furnishing credit for Iowa Agriculture, Joseph Lambert Benson

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Dry rot of corn , L. W. Durrell

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Nitrification and the nitrifying organisms Part I, Nitrifying organisms Part II, Certain conditions affecting the oxidation of ammonia and nitrite nitrogen Part III, Nitrates and nitrification in field soils, Rayadurg Nagan Gowda

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A study of the action of certain bacteria, yeasts and molds on the keeping quality of butter in cold storage, Michael Grimes

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The effect of certain external factors on the keeping quality of apples in storage, Thorland R. Hall

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The dietary properties of yeast, Victor G. Heller

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A study of the properties of wheat starch with reference to the baking qualities of flour , Glenn Garnet Naudain

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Hardy stocks for the apple, James A. Neilson

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An analysis of the power requirements of ensilage cutters, Vern W. Stambaugh

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The liberation of potassium from feldspars, and of potassium and carbon dioxide from soils by fertilizer and acid treatments, Silvere Cyril Vandecaveye

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Principles and practices involved in the breeding, feeding, and management of pure-bred draft horses in the United States, Valente Estrada Villegas

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The development of a test to determine the durability of lubricating oils for the internal combustion engine, Hiram Lew Wallace

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Immunologic significance of vitamins, Chester Hamlin Werkman

Theses/Dissertations from 1922

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The new dynamometer wagon for horse studies ..., John Franklin Beyerle

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Methods and scope of work of foreign agricultural Christian missions ..., John Howard Blough

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Union and growth affinity between scion and stock with Grimes apple grafted on other varieties, Arthur Ray Delamarter

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The effect of gypsum on Iowa soils, Lewis Wilson Erdman

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Studies in the growth and nutrition of dairy calves , Andrew C. McCandlish

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Studies of lime sulphur and arsenate of lead for spraying, James Sheldon Shoemaker

Theses/Dissertations from 1920

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The effect of gypsum on bacterial activities in soils , Thakur Mahadeo Singh

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Soil acidity and bacterial activityEffect of organic matter upon soil reaction II, Roscoe Elmo Stephenson

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Cold storage for Iowa apples, William Edwin Whitehouse

Theses/Dissertations from 1917

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Soil inoculation with azotobacter, Paul Emerson

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The degree of sexual activity of male rabbits as affecting the seminal discharge and the nature of the offspring, Frank Alfred Hays

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Influence of orchard soil management on the formation and development of apple buds ..., Robert Stearns Kirby

Theses/Dissertations from 1916

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Studies on the phenoldisulphonic acid method for determining nitrates in soils , Charles Wesley Davis

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Environmental influences on nectar secretion, Leslie Alva Kenoyer

Theses/Dissertations from 1915

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Method of finding for distribution and further development a good type of corn for Clinton County, Iowa, conditions, M. L. (Martin Luther) Mosher

Theses/Dissertations from 1910

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The peach: a study of the origin, classification, and development, Roger S. Mackintosh

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Relation between live stock farming and the fertility of the land, Henry A. Wallace