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Theses/Dissertations from 1942

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Forms of inorganic phosphorus in the lower horizons of some Iowa soils as indicated by plant availability and chemical methods, Matthias Stelly

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The effect of genetic constitution and processing methods on the ability of maize seed to germinate in cold soil , Loyd Allen Tatum

Theses/Dissertations from 1941

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A micromorphological approach to the study of soils , Joseph R. Johnston

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The influence of composition of plant materials on the properties of the decomposed residues, Walter Jackson Peevy

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A microscopic method for measuring soil pore space and for characterizing soil structure , C. Loyal W. Swanson

Theses/Dissertations from 1939

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Applicability of the Mitscherlich method to the determination of phosphorus deficiencies of Iowa soils , Clifford Dale Hoover

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Relation between the free energy of soil water and the moisture content of soil , Morell Belote Russell

Theses/Dissertations from 1938

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The effect of decomposition on the lignin of plant materials, John Bruen Bartlett

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The accuracy of the plating method for estimating the numbers of bacteria, actinomyces and fungi in a laboratory sample of soil , Norman James

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Some factors influencing nitrogen fixation by Azotobacter, John Loraine Sullivan

Theses/Dissertations from 1937

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Design of agronomic experiments for plots differentiated in fertility by past treatments , H. C. Forster

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Factors influencing the occurrence of Azotobacter in Iowa soils , William Paxman Martin

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Characteristic features of the microbiology of the Webster and Tama silt loams , Harold Albert Wilson

Theses/Dissertations from 1936

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Some kinematic and dynamic studies of rigid transport wheels for agricultural equipment , Eugene George McKibben

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The decomposition of some humus-forming materials in soils , Harvey Clifford Millar

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The effect of phosphate fertilizers on soil reaction, John Booth Peterson

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Some factors influencing the growth and respiration of rhizobium , David Wynne Thorne

Theses/Dissertations from 1935

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The yield response of maize hybrids to different levels of soil fertility and the physiological response of the inbred lines and their hybrids to phosphorus, Thomas Joseph Arceneaux

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The effects of liming on the liberation of potassium in some Iowa soils , Hartzell C. Dean

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A study of the effect of electric current on certain crop plants , Charles S. Dorchester

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Physiological studies on rhizobium IV. Utilization of carbonaceous materials , Oren Robert Neal

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Changes in the oxidation-reduction equilibrium in soils as related to the physical properties of the soil and the growth of rice, Madison B. Sturgis

Theses/Dissertations from 1934

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The influence of certain soil types, fertilizer treatments, and seasonal conditions on the length and strength of cotton fiber, Otis Alston Pope

Theses/Dissertations from 1933

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The effect of injury in imitation of hail damage on the development of corn , John Crosby Eldredge

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I. Reconnaissance erosion survey of the Brazos river watershed, Texas; II. A new type of installation for measuring soil and water losses from control plots , H. V. Geib

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Some properties of the soil solution and the colloids in certain Iowa soils , Gordon Beverly Killinger

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The metabolism of some nitrogen-fixing Clostridia , William Hillman Willis

Theses/Dissertations from 1932

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Decomposition of organic matter and responses of citrus seedlings in Norfolk sand, Charles Edward Bell

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The available phosphate content of soils and some factors affecting it, Samuel Shockley Obenshain

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Movement of fertilizers in Carrington loam, Oliver Enoch Overseth

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The Winogradsky spontaneous culture method for determining certain soil deficiencies , Arthur Wesley Young

Theses/Dissertations from 1931

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A study of crosses between Trebi and three smooth-awned varieties of barley , Pedro A. David

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Apple breeding : the effect of parentage on the relative vigor grade and correlation relationships of cross-bred apple progenies ..., Samuel Wheeler Edgecombe

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Certain physiological factors involved in the curing and storage of hay , Edwin Ray Henson

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The effects of various nitrogen and phosphorus compounds on the growth of Azotobacter and the fixation of nitrogen , Leonard Garnett Thompson Jr.

Theses/Dissertations from 1930

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Studies on sulfofication and the sulfofying bacteria , Dionisio I. Aquino

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Some effects of sorghums on soils and crops , Arthur David McKinley

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The determination of the nitrate assimilating power of soils and some nitrate fertilization studies , Ray A. Pendleton

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Studies on Rhizobium meliloti and Rhizobium japonicum , George Gordon Pohlman

Theses/Dissertations from 1929

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Studies in electrodialysis of soils , Arthur Otto Alben

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A soil study of the Mont Alto state forest, Pennsylvania , John T. Auten

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A chemical and microbiological study of Lufkin fine sandy loam in relation to productiveness , Elbert Brunner Reynolds

Theses/Dissertations from 1928

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Fruiting habit of the cotton plant , Thomas Stephen Buie

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Pathogenicity and cultural behavior of Ustilago zeae from different localities, Auther Hamner Eddins

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The determination of the availability of certain plant food constituents by electrodialysis, Harry Humfeld

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I. Some effects of manganese sulfate and manganese chloride on nitrification; II. The isolation of some nitrifying organisms , Daniel Hans Nelson

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Inheritance of certain seed-coat colors in soybeans (Soja max), Ralph T. Stewart

Theses/Dissertations from 1927

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Some chemical and biological effects of sulfur fertilization, James Milton Fife

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Physiological studies on the nitrogen fixing bacteria of the genus Rhizobium, Rudger H. Walker

Theses/Dissertations from 1926

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Some effects of limestone and hydrated lime on bio-chemical activities in acid soils , Henry Dorsey

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The solubility of rock phosphate as influenced by sulphur and gypsum , Winfield Scott

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Studies on the effects of method of application of fertilizers to some common field crops , Frederick Burean Smith

Theses/Dissertations from 1925

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Studies on soil fungi , Ernest Victor Abbott

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The form of legume nitrogen assimilated by non-legumes when grown in association, James Henry Stallings

Theses/Dissertations from 1924

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Biochemical effects of gypsum on Iowa soils , Walter Beno Bollen

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

Theses/Dissertations from 1923

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

Theses/Dissertations from 1922

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The effect of gypsum on Iowa soils, Lewis Wilson Erdman

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

Theses/Dissertations from 1917

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Soil inoculation with azotobacter, Paul Emerson

Theses/Dissertations from 1916

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

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