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Reproductive Genetics Of Caenorhabditis Nematodes, Dharani U. Matharage
Reproductive Genetics Of Caenorhabditis Nematodes, Dharani U. Matharage
Theses and Dissertations
Variation in reproductive traits and genome evolution reflects the interaction between selection, environment, and life-history. In the genus Caenorhabditis, recombination rate and sperm size exhibit a striking variation between strains and species. Here, Iintegrate three projects investigating recombination rate variation and recombination plasticity in C. elegans and sperm size divergence across Caenorhabditis species. First, I quantify recombination rates in two genetically distinct strains, N2 and CB4856, with different levels of laboratory adaptation using fluorescent markers spanning across gene-rich and gene-poor regions of the chromosome IV. I identify significant differences in recombination rate between the two strains within both gene-rich and …
Development And Evaluation Of A Closed-Loop Controlled Ugv With Rtk-Gps Navigation For Plastic Contamination Removal From Cotton Fields, Asifur Rahman
Development And Evaluation Of A Closed-Loop Controlled Ugv With Rtk-Gps Navigation For Plastic Contamination Removal From Cotton Fields, Asifur Rahman
Theses and Dissertations
Plastic contamination in cotton reduces fiber quality, causing an estimated $600 to $750 losses annually for the U.S. cotton industry. This work developed an RTK-GNSS-based UGV navigation for a collaborative UAV-UGV plastic retrieval system. An Amiga rover was adopted and modified, and a closed-loop PD steering control based on cross-track and heading error was developed and deployed in it. The first set of tests was conducted on a 111 m A-B line on a flat lane based on ASABE/ISO 12188-2 guidelines, then repeated in a cotton field. The P50 and P95, and max cross-track errors were about 1, 5, and …
Patterns Of Molecular Evolution Driving Reproductive And Genomic Processes In Sauropsids, Taylor Green
Patterns Of Molecular Evolution Driving Reproductive And Genomic Processes In Sauropsids, Taylor Green
Theses and Dissertations
Sexual reproduction is an important driver of genetic diversity and speciation through such forces as selection, mutation, and drift. Sauropsids are an appropriate clade to study shared molecular drivers of sexual and genomic evolution due to their genome architecture, sex determination mechanism (SDM) plasticity, and large syntenous genomic regions. Using comparative phylogenetic methods, I identify predictable patterns of selection in meiotic recombination genes and clade-specific drivers of recombination rate evolution. Then, leveraging whole genome sequencing, I demonstrate that American alligator genomes are characterized by an ancient loss of genetic diversity driven by drift and historic inbreeding. I also generate a …
The Lived Experiences Of Mississippi School Leaders Addressing Food Insecurity In Their Schools, Krista Vowell Nicholson
The Lived Experiences Of Mississippi School Leaders Addressing Food Insecurity In Their Schools, Krista Vowell Nicholson
Theses and Dissertations
Title of Study: The lived experiences of Mississippi school leaders addressing food insecurity in their schools Pages in Study 135 Candidate for Degree of Doctor of Philosophy Food insecurity among children in the United States remains a significant concern for educational leaders. Researchers have consistently found a relationship between food insecurity and diminished student academic outcomes. The purpose of this qualitative phenomenological study was to examine how school leaders and teachers in schools in Mississippi describe their lived experiences responding to students dealing with food insecurity. The research study included semi-structured interviews with 12 principals and teacher leaders from four …
Evaluating The Spray Patterns Of Boomless Spray Nozzles At Increasing Application Speeds, Thomas Hayden Duncan
Evaluating The Spray Patterns Of Boomless Spray Nozzles At Increasing Application Speeds, Thomas Hayden Duncan
Theses and Dissertations
Boomless nozzles have been largely ignored in spray studies, resulting in limited understanding of their spray patterns and how they are affected by operating parameters. A study was conducted to evaluate the effect of application speed on the performance of four boomless nozzles. Dyed water was applied to Kromekote® paper to assess spray distribution based on coverage data at three speeds, and MSMA was applied to a mixed turf stand to evaluate the effect of speed on performance. Overlap simulations were done to evaluate how uniformity could be improved, and nozzle performance was compared to manufacturer claims. Spray patterns of …
Impacts Of Structural Design On Oyster Survival And Predation In Restored Oyster Reefs, Jaden Akers
Impacts Of Structural Design On Oyster Survival And Predation In Restored Oyster Reefs, Jaden Akers
Theses and Dissertations
Restoration efforts are critical to ensure healthy oyster populations, but the high cost and marginal success rate of many restoration efforts demonstrates the need to evaluate alternative oyster reef restoration designs and strategies. To address this issue, I conducted a paired field and mesocosm study to assess the influence of structural design on oyster survival and predation. Results of the field portion of this study showed that oyster survival was greatest in short and bed-level (i.e., sitting on the sea bottom) reef designs. When assessing how design features impact oyster drill activity, elevated reefs (i.e., elevated above the sea bottom) …
Machine Learning-Based Decision Support Models With Applications In Postsecondary Education, Marco Paolo Anglesio
Machine Learning-Based Decision Support Models With Applications In Postsecondary Education, Marco Paolo Anglesio
Theses and Dissertations
This dissertation investigates the deployment of machine learning methodologies in an industrial engineering framework for the development of advanced decision support systems in the context of enrollment management. Drawing on techniques from educational data mining, the research addresses three key phases in the lifecycle of traditional and non-traditional students. First, it analyzes student retention using predictive classification models designed to identify individuals at elevated risk of attrition. Second, it employs temporal convolutional networks for time series forecasting, estimating aggregate enrollment levels over highly variable, finite planning horizons on the basis of partially observed data and using an asymmetric loss function. …
The Effect Of Stem Recutting And Floral Food On Vase Life Of Zinnias Elegans, Lauren Elise Baskin
The Effect Of Stem Recutting And Floral Food On Vase Life Of Zinnias Elegans, Lauren Elise Baskin
Theses and Dissertations
A recent shift in the cut flower market focuses on locally produced cut flowers, creating interest in the consumer mind. The vase life of these cut flowers varies by variety and species. Knowing the proper post-harvest protocol is crucial information, as this affects flower’s longevity. This research used a 2x2x2 factorial design examining the zinnias variation in vase life between the following test groups: zinnias with trimmed and untrimmed stems in tap water and trimmed and untrimmed stems in floral food solution. The results of the study indicated that zinnias placed in a floral food solution and were trimmed have …
Assessing Differences In The Frequency And Severity Of Osteoarthritis On The Mandibular Condyles Between Males And Females At Tell Abraq, Brittany C. Brown
Assessing Differences In The Frequency And Severity Of Osteoarthritis On The Mandibular Condyles Between Males And Females At Tell Abraq, Brittany C. Brown
Theses and Dissertations
Tell Abraq, a Bronze and Iron Age site in the United Arab Emirates, was a center of trade and cultural expansion during the Umm an-Nar period (2700–2100 BCE). Its multichambered tombs contain large, commingled burials, reflecting increasing sedentism and agricultural practices. This study examines mandibular osteoarthritis (OA) to explore lived experience and biomechanical stress. A total of 138 adult mandibles were analyzed for sex and OA severity. Results show generally mild and infrequent OA, though preservation limited analysis. Sex estimates suggested more gracile morphologies than previously identified. No strong sex-based differences in OA were observed. Overall, findings highlight the impact …
Cytokinins, Gibberellins, And Ethylene On Plant Form And Flowering In Streptocarpus, Rachel Bobo
Cytokinins, Gibberellins, And Ethylene On Plant Form And Flowering In Streptocarpus, Rachel Bobo
Theses and Dissertations
Plant form and flowering of Streptocarpus x hybridus Ladyslippers® ‘Grape Ice’ and ‘Deep Blue Vein’ were examined in response to exogenous application of ethephon [(2-chloroethyl) phosphonic acid], gibberellin 3 (GA3), benzyladenine (BA), and growth retardants ancymidol and chlormequat chloride. 750 mg L-1 ethephon applied at 3 weeks post-transplant (WPT) is effective in chemically pinching premature floral buds, delaying flowering by up to 10 days without restricting final plant size. Early applications of GA3 and BA hasten flowering by up to 10 days. GA3 and BA also interacted to promote floral development when applied early in the production cycle; increasing flower …
The Development And Evaluation Of An Automated Tactical Tillage Tool To Identify And Control Weeds In Row-Crop Production Systems Using Vision-Based Machine Learning., Clara Anne Cobb
Theses and Dissertations
Controlling in-field weeds in row-crop production systems is vital to the success of the operation. To control weeds, most producers use combinations of weed control strategies, including tillage and herbicide applications. Cotton production operations across the country have been trending toward conservation tillage practices in an effort to minimize soil disruption and maintain crop residues on the soil surface. This practice, in addition to the adoption of herbicide-tolerant cotton varieties, has encouraged more use of chemical herbicides. The overuse of these herbicides has resulted in an increase in herbicide-resistant weeds, making weed control difficult for farmers. This research aimed to …
From Miocene Origins To Ecological Diversification: Unraveling Evolutionary Dynamics Of North American Asters (Symphyotrichum), Sushil Dahal
From Miocene Origins To Ecological Diversification: Unraveling Evolutionary Dynamics Of North American Asters (Symphyotrichum), Sushil Dahal
Theses and Dissertations
Symphyotrichum, a plant genus traditionally treated within the genus Aster L., comprises >100 species of annual or perennial plants in the Compositae family Asteraceae. One of the most diverse genera in the southeastern US flora, the genus extends across the Americas, the Caribbean as well as eastern Eurasia. Despite its presence across the major American biomes and with distinctive floristic characteristics, several question regarding Symphyotrichum remains obscure. This research project focuses on exploring diverse aspects of Symphyotrichum systematics, biogeography and evolution. I tested three main hypotheses: (1a) Symphyotrichum originated ancestrally across Mexico and eastern North America in the Miocene ( …
The Role Of Risk And Resilience In Psychological Distress: An Application Of The Minority Stress Model, Rachel Clair Franklin
The Role Of Risk And Resilience In Psychological Distress: An Application Of The Minority Stress Model, Rachel Clair Franklin
Theses and Dissertations
LGBT individuals experience disproportionate levels of psychological distress compared to heterosexual populations, often attributed to minority stressors, including experiences of discrimination and victimization. Guided by the Minority Stress Model, the present study examined whether social and community support moderated the relationship between minority stress and psychological distress, and whether rejection sensitivity and fear of discrimination mediated these associations. Data were collected from a sample of 251 individuals who self-identified as lesbian, gay, bisexual, or transgender in the United States. Multiple regression, moderation, and mediation analyses using the PROCESS macro were conducted to examine relationships among experiences of discrimination, sexuality-based victimization, …
A Woman’S Wilderness: Fostering Mental Well-Being Through Sensory Stimulation In The Outdoors, Anah Gaynes
A Woman’S Wilderness: Fostering Mental Well-Being Through Sensory Stimulation In The Outdoors, Anah Gaynes
Theses and Dissertations
The female experience with nature is unique (Nurse, G. A., Benfield, J., Bell, P. A., 2010). This provokes the question explored in this study: “What sensory interactions impact women’s mental well-being in nature-based therapy programs?” This study invited participants of nature-based retreats held at 4 Winds Farm in Glenwood Springs, Colorado or Summit Sisters at Cal-Wood Education Center in Jamestown, Colorado. Findings indicate that women’s positive emotions are significantly impacted by their sensory experiences. It also revealed a fascination with trees and the importance of tactile experiences. For landscape architects this brings about a new challenge in designing for the …
Investigating Teacher Cognition Of Teaching Spatial Thinking Among Middle And High School Stem Teachers: A Knowledge, Belief, And Attitude Perspective, Jonathan Grant Harris
Investigating Teacher Cognition Of Teaching Spatial Thinking Among Middle And High School Stem Teachers: A Knowledge, Belief, And Attitude Perspective, Jonathan Grant Harris
Theses and Dissertations
Spatial thinking is a critical cognitive ability that supports learning and problem solving across science, technology, engineering, and mathematics (STEM) disciplines. Despite extensive research highlighting the importance of spatial thinking in STEM achievement and career success, limited research has examined STEM teachers’ cognition of spatial thinking or developed instruments to measure it. The purpose of this study was to investigate middle and high school STEM teachers’ cognition of spatial thinking, including their perceived pedagogical content knowledge (PCK) of spatial thinking, self-efficacy beliefs about teaching spatial thinking, and attitudes toward spatial thinking as a critical component of STEM learning and achievement. …
Accelerating Defensive Cyber Operations Via Unsupervised Log Clustering And Automated Regex Template Synthesis, Charles Matthew Jones
Accelerating Defensive Cyber Operations Via Unsupervised Log Clustering And Automated Regex Template Synthesis, Charles Matthew Jones
Theses and Dissertations
Modern Security Operations Centers (SOCs) ingest millions of log entries per day, but manual parsing does not scale to the volume, heterogeneity, and rapid evolution of log formats. This dissertation investigates whether unsupervised clustering can automate the generation of candidate field-extraction templates while remaining deployable in production and feasible under realistic runtime and memory constraints. The central research question asks whether a machine-learning-assisted pipeline that proposes extraction templates for security engineer review—relative to reproducible human-authored baselines such as hand-written regular expressions—can measurably improve rule-set deployability and corpus-scale extraction quality. Improvement is quantified using four applicability metrics: Coverage Rate (CR), Exclusive …
Our Home Away From Home? A Transnational Intersectional Exploration Of Colorism And Group Identity Among Black Surinamese Dutch People, Ashley Melcherts
Our Home Away From Home? A Transnational Intersectional Exploration Of Colorism And Group Identity Among Black Surinamese Dutch People, Ashley Melcherts
Theses and Dissertations
In this study, I explore the influence of colorism on Black Surinamese Dutch group identity formation. Through a transnational intersectional lens rooted in Black feminism, I examine the role of colorism in the formation of group identity of Black Surinamese Dutch people. I also examine gendered aspects of colorism. Data for this dissertation come from virtual and face-to-face semi-structured in-depth interviews I conducted with 25 Black Surinamese diaspora members in the Netherlands, one Black Surinamese diaspora member in Spain, and one Black Surinamese diaspora member in the United States. Interviews reveal how Black Surinamese Dutch people negotiate colorism coming from …
Assessing Biotic And Abiotic Drivers Of Hybridization And Species Delimitation In A Highly Reticulate Syngameon, Nicholas John Engle-Wrye
Assessing Biotic And Abiotic Drivers Of Hybridization And Species Delimitation In A Highly Reticulate Syngameon, Nicholas John Engle-Wrye
Theses and Dissertations
Hybridization, or the flow of genetic materials between varieties or species, shapes evolution by generating novel genotypes, altering allele frequencies, and driving diversification. Yet, the rate at which hybridization occurs is heterogeneous across the tree of life and the ecological and evolutionary factors that govern its occurrence remain poorly understood. This dissertation examines how conserved biotic and abiotic niches influence hybridization and uses integrative methods to delimit species boundaries within Heuchera (Saxifragaceae), a genus notable for widespread interspecific gene flow and cryptic morphological diversity. Results reveal that hybridization is most frequent where pre- and postzygotic barriers are weak, as with …
Investigating Semantic Categorization Using Fast Periodic Visual Stimulation, Zack Murphy
Investigating Semantic Categorization Using Fast Periodic Visual Stimulation, Zack Murphy
Theses and Dissertations
Fast periodic visual stimulation (FPVS) with EEG provides a rapid method for isolating both higher-order and lower-order cognitive responses, an advantage that could prove useful in future research into higher order cognitive tasks. This thesis tested whether a semantic categorization response could be reliably differentiated from a low-level color response. EEG data were collected while 33 young adults viewed image sequences of fruits and vegetables of varying colors across five experimental conditions that compared color and semantic categorization responses. Frequency domain analysis revealed that color responses were much stronger and localized to the Left Occipito-Temporal (LOT) region of interest (ROI) …
Plasma Pharmacokinetics Of Topical 0.1% Diclofenac Sodium And 0.5% Ketorolac Tromethamine In Dogs, Jacqueline Peraza
Plasma Pharmacokinetics Of Topical 0.1% Diclofenac Sodium And 0.5% Ketorolac Tromethamine In Dogs, Jacqueline Peraza
Theses and Dissertations
To determine plasma concentrations of ophthalmic 0.1% (w/v) diclofenac sodium and 0.5% (w/v) ketorolac tromethamine following 4 times daily ophthalmic administration in healthy dogs. Eight dogs were randomly assigned to a diclofenac or ketorolac group. Plasma was collected before drug administration. Plasma samples were collected after the 4 pm treatments on days 1 and 5. Plasma concentrations (ng/mL) were quantified by liquid chromatography-mass spectrometry and analyzed with noncompartmental pharmacokinetic analysis. After ophthalmic administration of 0.1% diclofenac, mean t1/2, Tmax, and Cmax occurred at 3.08 0.9 hours, 121.4 2.8 hours, 0.12 0.05 ug/mL, respectively. The mean t1/2, Tmax, and Cmax after …
Characterizing The Microbial Structure And Function In Black Soldier Fly Digested Dairy Manure And Subsequent Larvae, Branden N. Pierce
Characterizing The Microbial Structure And Function In Black Soldier Fly Digested Dairy Manure And Subsequent Larvae, Branden N. Pierce
Theses and Dissertations
This work examined the microbial structure and gene expression found in Black Soldier Fly larval guts and their frass when reared on dairy cattle manure that had been amended with either R. rhodococcus 21198, P. polymyxa 8158, or both and compare the results to larvae reared on untreated manure. First an overview of literature surrounding projected global food supplies and the possible use of insects to either increase them or mitigate the environmental effect of producing said supply. A cellulose degradation assay was performed to assist in determining which bacterial species to use as amendments. Characterization of the microbial communities …
A Cradle To Grave Life Cycle Assessment Of Captured Landfill Methane Abatement Strategies, Joshua Caleb Richard
A Cradle To Grave Life Cycle Assessment Of Captured Landfill Methane Abatement Strategies, Joshua Caleb Richard
Theses and Dissertations
Landfill methane mitigation strategies are commonly evaluated using percentage-based leakage assumptions and linear scaling models. These approaches may misrepresent system performance at varying throughput levels and real-world operating scenarios. This thesis develops a system-level life cycle assessment framework that incorporates both fixed infrastructure losses and employs sensitivity analysis to more accurately characterize emissions from landfill gas management pathways. Three scenarios are evaluated: methane capture and flare, methane capture and combustion for electricity generation, and methane upgrading with pipeline injection as renewable natural gas. Results demonstrate that emissions models over- dependance on static factors may inadvertently lead to under-reporting and provide …
No-Till Versus Conventional Tillage Cover Crop Systems Effects On Cotton In The Blackland Prairie Region Of Mississippi, Mallie West Rivenbark
No-Till Versus Conventional Tillage Cover Crop Systems Effects On Cotton In The Blackland Prairie Region Of Mississippi, Mallie West Rivenbark
Theses and Dissertations
Nitrogen (N) plays a critical role in cotton production systems. Management practices such as tillage systems and cover crops (CC) can influence nutrient cycling and availability within the soil. The present study assessed the effects of CC in a conventional tillage (CT) vs. no-tillage (NT) system on cotton yield, fiber quality and N use efficiency. Ramifications for CC and N rates on lint yield and cotton N uptake were investigated during the 2024 and 2025 growing seasons in Verona, MS. Cover crop treatments include cereal rye (Secale cereale), crimson clover (Trifolium incaranatum) and a mix of cereal rye and crimson …
Nesting Ecology And Responses To Snag Resource Fluctuations Of Red-Headed Woodpeckers In Working Pine Forests, Zoe Elise Scott
Nesting Ecology And Responses To Snag Resource Fluctuations Of Red-Headed Woodpeckers In Working Pine Forests, Zoe Elise Scott
Theses and Dissertations
Southeastern working pine forests provide opportunities for sustainable management that balance conservation and economic objectives. Red-headed woodpeckers (Melanerpes erythrocephalus), as primary cavity excavators, play a disproportionate role in forest ecosystems, making them an ideal focal species for evaluating management strategies. From 2024-2025, we monitored 103 nesting attempts in loblolly pine (Pinus taeda) forests of Mississippi and Alabama, assessing nest site selection and survival. Nests were concentrated in early successional stands, with selection favoring taller snags with advanced decay characteristics, greater understory cover, and north-to-west cavity orientation. Nest survival increased with reduced cavity accessibility. Simulation models of varying snag retention levels …
Comprehensive Study Of The Durability And Protective Measures Of Cross-Laminated Timber, Samuel Gray Shumate
Comprehensive Study Of The Durability And Protective Measures Of Cross-Laminated Timber, Samuel Gray Shumate
Theses and Dissertations
The growing use of cross-laminated timber (CLT) in sustainable construction necessitates improved protection against biological deterioration. This study evaluates the fungal resistance of Southern Pine CLT fabricated from lumber pre-treated with micronized copper azole (MCA). Panels were produced under industrial pressing conditions, and durability was assessed using a modified American Wood Protection Association (AWPA) E10-22 soil block test against four brown-rot fungi. Results showed significant decay reduction for Coniophora puteana and Neolentinus lepideus, while protection was less effective against Gloeophyllum trabeum and Rhodonia placenta. Findings indicate that pre-treatment enhances preservative distribution but does not fully prevent decay in high-hazard environments. …
Impacts Of Goat Grazing On Coastal Upland Understory, Maya Stratman
Impacts Of Goat Grazing On Coastal Upland Understory, Maya Stratman
Theses and Dissertations
Coastal upland pine savannas and flatwoods along the northern Gulf of Mexico are biodiversity hotspots degraded by woody encroachment following fire suppression and loss of herbivory. Conservation grazing has been proposed as a management tool, yet its effectiveness in these systems remains understood. This study evaluated how goat grazing frequency and duration influence understory vegetation structure, diversity, productivity, and light availability in an Ilex-dominated coastal upland in Mississippi. Five grazing treatments (monthly, every three months, biannual, seasonal, and ungrazed control) were applied across 25 plots over one year. Vegetation percent cover, genus richness, Normalized Difference Vegetation Index, light penetration, and …
Exploring The Effect Of Students' Exclusionary Discipline On Their Academic Achievement In A Rural High School., Danya Turner
Exploring The Effect Of Students' Exclusionary Discipline On Their Academic Achievement In A Rural High School., Danya Turner
Theses and Dissertations
The purpose of this quantitative study was to examine the extent to which exclusionary discipline practices, specifically in-school suspension and out-of-school suspension, are associated with academic achievement among high school students. More specifically, the study investigated the relationship between students’ exclusionary discipline days and performance on Mississippi Academic Assessment Program (MAAP) assessments in Algebra I, Biology, English II, and U.S. History. The study was guided by the Opportunity to Learn (OTL) framework, which emphasizes the importance of access to instructional time for student academic success. Archival discipline and assessment data were collected from a rural public high school in east-central …
Effects Of Melatonin Supplementation On Exercise Induced Stress In Horses, Hannah Clark Valigura
Effects Of Melatonin Supplementation On Exercise Induced Stress In Horses, Hannah Clark Valigura
Theses and Dissertations
Exercise is a necessary component of athletic conditioning but imposes substantial physiological stress on horses, resulting in oxidative stress, inflammation, muscle damage, and thermal strain that can impair performance and recovery. Melatonin, a neurohormone with potent antioxidant and thermoregulatory properties, has been proposed as a novel nutritional strategy to mitigate these effects. This dissertation aimed to (1) characterize serum melatonin concentrations following oral supplementation, (2) evaluate the effects of melatonin on oxidative stress, inflammation, and muscle damage biomarkers after exercise, and (3) examine its influence on physiological parameters during exercise under warm weather conditions. Across a series of controlled experiments …
Tracing Hazing Across Adolescence: Examining How Prior Hazing Experiences Shape Hazing Motivation And Tolerance Among Newly Initiated Ifc Fraternity Members, John Michael Vanhorn
Tracing Hazing Across Adolescence: Examining How Prior Hazing Experiences Shape Hazing Motivation And Tolerance Among Newly Initiated Ifc Fraternity Members, John Michael Vanhorn
Theses and Dissertations
Hazing remains pervasive and underreported, disproportionately affecting adolescent and emerging adult men, particularly within athletic teams and fraternity contexts. Although hazing is most often studied within collegiate organizations, many students encounter hazing behaviors prior to college, yet little is known about how these early experiences shape later hazing perceptions, motivations, tolerance, and masculine norms. Grounded in Bronfenbrenner’s Process-Person-Context-Time (PPCT) model, this dissertation conceptualizes hazing as a developmental process shaped by repeated social interactions, individual characteristics, contextual environments, and time across adolescence and emerging adulthood. Using a two-paper approach with a quantitative, longitudinal survey design, study 1 examined fraternity new members’ …
Delayed Timing Of Spring Application Of Nitrogen In Corn, Elizabeth Mae Worley
Delayed Timing Of Spring Application Of Nitrogen In Corn, Elizabeth Mae Worley
Theses and Dissertations
Application timing of nitrogen (N) fertilizer within the corn growing season can be crucial to crop nutrient uptake and availability. A lack of region-specific timing recommendations may result in inefficient fertilizer use and inconsistent yield responses. The objectives of this study were to determine how late in the growing season a first and second N fertilizer application can be pushed until corn yield is impacted and investigate whether Growing Degree Days (GDDs) should be used as better estimate of timing for N application than calendar date or growth stage. First applications were able to be delayed until V4-V6 growth stages …