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Theses/Dissertations from 2017

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Scaling understanding of biochar aging impacts on soil water and crop yields, Deborah Marie Aller

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The optimization of introgression projects for plant genetic improvement, John Nicholas Cameron

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Genetic studies on self-fertility in perennial ryegrass (Lolium perenne L.) with implications for hybrid breeding in allogamous grasses, Javier Do Canto Fagundez

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Genome wide association study of seed and seedling root traits in sunflower, Ze Tian Fang

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Evaluating alternative, diverse cropping systems that include canola, wheat, and red clover in Iowa, Stefans Robert Gailans

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Investigations into nutritional quality, commercial productivity, and genetic purity of maize grain for organic production systems, Ryan Huffman

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Assessment of genetic diversity and recombination in maize, Alina Ott

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Nitrogen fertilization and crop diversity effects on soil carbon and nitrogen cycling in Iowa cropland, Hanna Jane Poffenbarger

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Molecular and phenotypic characterization of doubled haploid exotic introgression lines for nitrogen use efficiency in maize, Darlene Lonjas Sanchez

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How does inclusion of weather forecasting impact in-season crop model predictions?, Kaitlin Togliatti

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Numerical methods in soil hydrology: TDR waveform analysis and water vapor diode simulation, Zhuangji Wang

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Production, perceptions and limitations of organic small grains in Iowa, David Weisberger

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Developing specialty corn for niche markets in the public sector: A story of tradition and innovation, Hannah Worral

Theses/Dissertations from 2016

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Cover crop options and mixes for upper Midwest corn-soybean systems, Seth R. Appelgate

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Growth, productivity, and utilization of kenaf (Hibiscus cannabinus L.): A promising fiber and fuel crop for Iowa, Marie Bourguignon

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Carbon and nitrogen stabilization across a reconstructed prairie chronosequence at Neal Smith Wildlife Refuge, Shane Michael Bugeja

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Quantifying senescence-mediated nutrient loss processes in switchgrass (Panicum virgatum L.) biomass, Ruth Helen Burke

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Pedogenesis of outwash derived soils on terraces of the Des Moines River, Ethan Matthew Dahlhauser

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The use of genetic information to predict the relative maturity of soybeans, Tracy William Doubler

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Organic matter in Holocene paleosols in the US Mid-Continent, Llewin Hugh Froome

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Improved production systems for common bean in south-central Uganda: I. Liddugavu soil, II. Limyufumyufu soil, Lance Henry Goettsch

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Potassium and sulfur availability and lime potential of ash co-product of corn cellulosic ethanol processing, Samuel Groenenboom

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Brassinosteroid and gibberellin control of plant height in maize (Zea mays. L), Songlin Hu

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Evaluating temperate and tropical corn for biomass production in central Iowa, Pedro Alexander Infante-Posada

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Investigation of the anti-virC2 transcript in Agrobacterium tumefaciens, Abbagail Lauren Johnson

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Influence of source and particle size of agricultural limestone on efficiency at increasing soil pH, John David Jones

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A genetic and genomic study of resistance to 4-hydroxyphenylpyruvate dioxygenase (HPPD) inhibitor herbicides in Amaranthus tuberculatus (waterhemp), Daniel Robert Kohlhase

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Spatially consistent corn yield variability on the Loess Hills of Northwest Iowa: a critical look, Thomas J. Lawler

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Biochar for sustainable advances in agriculture and environmental remediation, Michael Lawrinenko

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Investigation of germination, growth, sporulation, and host-induced RNA interference in Fusarium virguliforme, Jill Marshall

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Identification and characterization of brown stem rot resistance in soybean, Chantal Elaine McCabe

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Genomic Selection with Deep Neural Networks, Riley Mitchell Mcdowell

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Genome-wide association and epistasis studies of Sclerotinia sclerotiorum resistance in soybean, Tara Catherine Moellers

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Reducing Herbicide Use Through Cropping System Diversification: A Case Study at the Iowa State University Marsden Farm, and Some Recommendations for the Mekong Delta of Vietnam, Huong Nguyen

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Nitrogen pools and fluxes in diversified cropping systems, William Robert Osterholz

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Quantitative trail loci mapping of seed protein and oil composition in a diverse soybean recombinant inbred line population, Kyle Parmley

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Rye cover crop biomass, nutrient composition and crop management practices to enhance corn yield, Swetabh Patel

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Phosphorus forms, transformation, sorption, and release in sediments of Walnut Creek watershed, Iowa, Suroso Rahutomo

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Soils of Iowa: An examination of three pedological assumptions, Jenny Richter

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Biomass sorghum and maize have similar water-use-efficiency under non-drought conditions in the rain-fed, Midwest US, Matthew Roby

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Mesoscale convective complexes in regional climate modeling and increased extreme precipitation due to agricultural landuse change over the central U.S., Taleena Rae Sines

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Effects of recurrent selection for yield on plant growth across planting densities in maize (Zea mays L.), Michael Jonathan Stein

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Evaluation of conditions affecting Agrobacterium-mediated genetic transformation of soybean (Glycine max L.) and common bean (Phaseolus vulgaris L.), Amber Lynn Testroet

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Dissecting adaptation through the exploration of flowering time in maize (Zea mays L.), Adam Edward Vanous

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Why is SMOS dry compared to soil moisture observed by the South Fork in situ soil moisture network?, Victoria A. Walker

Theses/Dissertations from 2015

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Developmental morphology, biomass yield and compositional differences among upland and lowland switchgrass (Panicum virgatum L.) ecotypes grown as a bioenergy feedstock crop, Muhammad Aurangzaib

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Climate-smart agriculture in Midwest cropping systems: evaluating the benefits and tradeoffs of cover crops, Andrea Diane Basche

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Phenotypic and genetic variation in an Apios americana breeding collection; and characterization of the HD-Zip gene family, involved in abiotic stress responses in Glycine max, Vikas Belamkar

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Enabling broad use of genome modification technologies to solve real world problems: a specific application in peanut, Vincent Antonio Brazelton Jr.

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Influence of Bradyrhizobium inoculation and fungicide treatment on development and yield of selected pulse crops; Nutritional composition of pulse legume leaves and the impact of leaf removal on yield, Rosemary Bulyaba

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Changes in extreme precipitation events over the central United States in AOGCM-driven regional climate model simulations, Ariele Rhiane Daniel

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The physiological effects of the seed treatment Stamina on maize seedling length, ADP:O ratios, and respiration rates, Katy Lynn Darrah-Wiedemeier

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Microbial decomposition of corn residue in two Iowa Mollisols, Omar de Kok-Mercado

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Improvements to the maize (Zea mays L.) in vivo maternal doubled haploid system, Gerald Neil De La Fuente

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Screening of herbicides for selective weed control in African marigold (Tagetes erecta), Katie Jean Demers

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Gametophytic cross-incompatibility in maize: resequencing the Ga1 locus, Marianne Lynn Emery

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Biochar properties and impact on soil CO2 and N2O emissions, Rivka Brandt Fidel

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Validation and application of close-range photogrammetry to quantify ephemeral gully erosion, Karl Richard Gesch

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Genetic and physiologic analyses of soybean grain yields in water limited environments, Dawn Gibson

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Sensible heat balance method to determine rates of soil freezing and thawing, Yuki Kojima

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Influence of corn seeding rate, soil attributes, and topographic characteristics on grain yield, yield components, and grain composition, Mark Allen Licht

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Phenotypic plasticity and heterosis: Insights from sorghum flowering time and plant height, Xin Li

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Cover crop impacts on soil quality during Miscanthus x giganteus establishment in central Iowa, Joyce Y.J. Lok

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Portable canopy chamber measurements of evapotranspiration in corn, soybean and reconstructed prairie, Chenyi Luo

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Suitability of winter canola (Brassica napus) for enhancing summer annual crop rotations in Iowa, Rafael A. Martinez-Feria

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Nitrogen mineralization in biofuel cropping systems in soils, Yili Meng

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Pedology of corn productivity indices for selected parts of Southern Highland Zone of Tanzania, Johnson Godlove Mtama

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Plant molecular farming for the production of industrial enzyme and vaccines, Hartinio N. Nahampun

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Genetic architecture and predictability of seedling root traits in maize (Zea mays L.), Jordon Michael Pace

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Biosynthetically produced amino acid byproducts can replace nitrogen fertilizers for corn production, Juan Carlos Quezada Rivera

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Winter rye cover crop effect on corn seedling pathogens, Lara Ann Schenck

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Plant tissue analysis to assess phosphorus and potassium nutritional status of corn and soybean in Iowa, Andrew John Stammer

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Identification of QTL associated with nitrogen metabolism in a maize (Zea mays L. ssp. mays) testcross population, Ignacio Trucillo Silva

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Time domain reflectometry waveform analysis with second order bounded mean oscillation, Zhuangji Wang

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Corn seedling response to silicon amendments in three Iowa and one Chinese soil, Ziying Wang

Theses/Dissertations from 2014

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Interactions between cover crops and weed management in Iowa's conventional cropping systems, Meaghan Jean Bryan Anderson

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An integrative approach for germplasm utilization, genetic diversity and QTL mapping in Camelina spp. and crop-production issues in Thlaspi arvense, new promising oilseed crops for bioenergy and industrial uses, Ivan Mauricio Ayala Diaz

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Adaptability potential of corn for groundcover cropping systems, Nickolas James Bowden

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Evaluation of an agroecosystem model using cosmic-ray neutron soil moisture, Benjamin David Carr

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Fumonisin B1 toxicity in swine: a comparative analysis of genetically engineered Bt corn and non-Bt corn by using quantitative dietary exposure assessment modeling and ecotoxicological investigations on earthworms, James Edward Delgado

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A carbon assessment of Iowa State University's land, Catherine Rosson DeLong

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A comparison of carbon storage potential in corn- and prairie-based agroecosystems, Ranae Dietzel

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Relationships between foliar applied micronutrients, soil and tissue tests, and grain yield in soybean, Joshua T. Enderson

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Intensifying intrinsic genetic variation in soybean [Glycine max (L.) Merr.] inbred lines, Katherine Espinosa

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Genetic analysis of the IBM2Syn10-DH maize population for response to low and high nitrogen input, Pedro José Gonzalez-Portilla

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Soil hydraulic conductivity in a non-wheel traffic corn row, a wheel traffic corn row, and a reconstructed prairie, Sitha Ketpratoom

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Anion exchange capacity of biochar, Michael Lawrinenko

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A next generation of studies: Heterosis and inbreeding depression, Shreyartha Mukherjee

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A comparison of cellulosic fuel yields and separated soil-surface CO2 fluxes in maize and prairie biofuel cropping systems, Virginia Nichols

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Comparison of SMOS vegetation optical thickness data with the proposed SMAP algorithm, Jason Carl Patton

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Corn production with Instinct nitrification inhibitor applied with urea-ammonium nitrate solution and liquid swine manure, Aaron Michael Sassman

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Germplasm enhancement of maize: Utilization of doubled haploid breeding on adapted tropical sources, Andrew Smelser

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Efficiency study of testing and selection in progeny-row yield trials and multiple-environment yield trials in soybean breeding, Minghui Sun

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Loose and baled corn cob management and storage in field effects on subsequent crop growth and soil health, Carlos Gilberto Tenesaca

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Genome-wide association studies to dissect the genetic architecture of yield-related traits in maize and the genetic basis of heterosis, Jinliang Yang

Theses/Dissertations from 2013

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Density response of maize canopy architecture in adapted and unadapted synthetic populations, Naser Bader AlKhalifah

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Organic matter in Holocene paleosols at the Farwell site, Najwa Alnsour

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Hybrid breeding in perennial grasses based on self-incompatibility and self-fertility, Andrea Sofia Arias Aguirre

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Evaluation and prediction of corn stover biomass and composition from commercially available corn hybrids, Ty Jason Barten

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The influence of propagation method and stand age on Miscanthus x giganteus performance in Iowa, USA, Nicholas Boersma