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Dried Water Treatment Residuals Might Be An Option To Reduce Soluble Reactive Phosphorus Release From Soils, Katie B. Mckay

Biological and Agricultural Engineering Undergraduate Honors Theses

Nonpoint source pollution from agricultural landscapes contributes to freshwater eutrophication, with legacy phosphorus (P) in soils potentially driving soluble reactive phosphorus (SRP) losses to surface waters. The objectives of this study were to evaluate SRP adsorption by dried water treatment residuals (WTRs) produced by Beaver Water District, quantify reductions in soil SRP release across increasing WTR application rates, and compare dried WTR performance to prior WTR studies.

Dried WTRs (~98% solids) were assessed using batch sorption experiments and soil core incubations. Phosphorus sorption was measured by mixing WTRs with CaCl₂ solutions containing increasing SRP concentrations and fitting results to …

Arkansas Soybean Research Studies 2024, Jeremy Ross

Arkansas Agricultural Experiment Station Research Series

The 2024 Arkansas Soybean Research Studies includes research reports on topics pertaining to soybean across several disciplines from breeding to post-harvest processing. Research reports contained in this publication may represent preliminary or only data from a single year or limited results; therefore, these results should not be used as a basis for long-term recommendations. Several research reports in this publication will appear in other University of Arkansas Division of Agriculture’s Arkansas Agricultural Experiment Station publications. This duplication is the result of the overlap in research coverage between disciplines and our effort to inform Arkansas soybean producers of the research being …

Discovering The Genetics Underlying Speciation Traits In Heuchera (Coral Bells), Tajinder Singh

Honors Theses

Hybridization is a key evolutionary mechanism for generating biological diversity, ultimately shaping diversification and adaptation of plant lineages in natural and agroecosystems.  Our understanding of the frequency, distribution, and significance of hybridization is rapidly increasing, but the external driving forces that dictate why certain species hybridize, and others do not remain obscure. The physical traits that shape gene flow and trait sharing among species are likely to be among the key factors that directly control hybridization. Gene flow in most plants is mediated by pollinating insects and thus by pollination syndromes, which are suites of floral traits that have evolved …

The Effect Of Liquid Foliar Fertilizer And Pruning Combinations On The Growth Of Productive Phase Arabica Coffee Plants (Coffea Arabica L.), Syifa Djuita Putri, Alvito Krishna Balapradhana, Mira Ariyanti, Intan Ratna Dewi Anjarsari, Yudithia Maxiselly

Jurnal Kultivasi

In recent years, productivity decline in arabica coffee has become a real issue in Indonesia. This decay has been brought about by various external and internal factors that are beyond human control. Various factors, including suboptimal cultivation practices, take part in this process. The objective of the present study was to evaluate the effect of pruning combined with foliar fertilizer application (coconut water and sugarcane molasses) and 6-benzylaminopurine (BAP) on the vegetative growth of arabica coffee plants during the production phase. The research was conducted at Ciparanje Experimental Field, Universitas Padjadjaran, using a randomized complete block design with seven treatments …

Growth And Yield Response Of Shallots To Npk, Nk, And Humic Acid Under Different Mycorrhiza Application, Alfu Laila, Endang Sulistyorini

Jurnal Kultivasi

One strategy to increase shallot production is the utilization of microorganisms in the soil, such as arbuscular mycorrhizal fungi (AMF), which is applied together with fertilizer. This research aimed to investigate the effects of different nutrient inputs and mycorrhizal association on the growth and yield of shallots. This study used a split-plot design with three replications as blocks. The main plot included four treatments: no nutrient inputs, NPK fertilizer, NK fertilizer, and humic acid, while the subplot involved the mycorrhiza application (with or without). The measured variables included growth (plant height and number of leaves) and yield (fresh weight and …

Growth Response And Yield Performance Of Upland Rice Intercropped With Legumes, Sevirasari, Wilujeng Hidayati, Zulfa Az Zahroh, Bayu Febriansyah, Marifatul Apri Fiana, Nabilla Najwa Rochmaniah, Khavid Faozi, Lafi Na'imatul Bayyinah, Joko Maryanto, Ahmad Fauzi

Jurnal Kultivasi

Intercropping patterns in upland rice must be carefully managed to prevent excessive competition among crops. This research aimed to determine the ideal proportion of upland rice–legume intercropped and legume types for rice growth and yield. The research was conducted in Mersi, East Purwokerto, Banyumas, Central Java, from April–August 2025. The study was arranged in a split-plot design consisting of a main factor in form of the proportion of upland rice to legumes (1:1, 2:1, and 3:1), and a sub-factor, i.e., legume types (peanuts, mung beans, and soybeans). The data were analyzed using Analysis of Variance and Tukey's HSD test at …

Target-Site Resistance To Glyphosate In Eleusine Indica Biotypes From South Sulawesi And Lampung, Indonesia, Ahmad Nur Lazuardi, Denny Kurniadie, Uum Umiyati, Ryan Widianto

Jurnal Kultivasi

Glyphosate is a non-selective systemic herbicide that has been widely used to control weeds by local corn farmers in South Sulawesi and Lampung Provinces of Indonesia. However, some corn farmers in these two regions were considered that glyphosate herbicide at the standard field dose no longer effective against goosegrass (Eleusine indica). To confirms the level of its resistance to glyphosate, seeds of E. indica suspected to be glyphosate-resistant were collected from corn fields in Soppeng Regency-South Sulawesi and South Lampung Regency-Lampung (designated as GR-1 and GR-2 respectively), along with a known susceptible biotype from Sumedang Regency-West Java (GS) as a …

Response Of Chlorophyll, Morphology, And Yield Of Several East Java Superior Soybean (Glycine Max L.) Varieties To Levels Of Salinity, Puji Lestari Tarigan, Ida Retno Moeljani, Fadila Suryandika, Hadi Munarko

Jurnal Kultivasi

Soybean production has been extended to saline areas. This development is a strategy to expand planting areas to suboptimal land to increase worldwide production. To support cultivation in these locations, it is necessary to develop superior varieties that are resistant to salinity and provide supporting technological inputs. In saline conditions, soybeans may face stress that leads to morphological, physiological, and yield disturbances. Consequently, the response of several soybeans in East Java should be observed. This study is a pot experiment and arranged in a Factorial Completely Randomized Design (CRD) consisting of two factors, soybean varieties and NaCl concentrations. The treatments …

Effects Of Spatially Targeted Fertilizer Strategies On Canopy Growth Across Contrasting Tart Cherry Orchard Sites, Kurt Wedegaertner, Brent Black, Matt Yost, Grant Cardon

Plants, Soils and Climate Student Research

Variable-rate fertilization is increasingly promoted in perennial orchard systems, but its effectiveness remains difficult to predict because tree responses are often inconsistent and strongly conditioned by site-specific constraints. To address this, we evaluated soil-based and vigor-based zoning frameworks across four commercial tart cherry (Prunus cerasus) orchards representing contrasting soil conditions, canopy structures, and management histories. Within each orchard, management zones were defined using either soil apparent electrical conductivity (ECa) or satellite-derived canopy vigor. Fertilization strategies were implemented by varying fertilizer application timing among zones using split-application approaches while maintaining a constant total fertilizer rate. Tree-level canopy structure was …

Evaluating Differences In The Dynamic Growth Patterns Of Cvi And Ler Genetic Strains Of Arabidopsis During Seedling Establishment, Emily Frost

Undergraduate Research Symposium (2026- )

Seedling establishment is the process by which seedlings transition from depending on seed nutrients to making their own through photosynthesis. An important aspect is photomorphogenesis, the growth of plants in response to light, transitioning from rapid embryonic stem growth to a slower rate focused on root growth and leaf formation. The process is influenced by many genetic and environmental factors, making better characterization essential to understand plant development. For our research, we examined the dynamic growth of two Arabidopsis genetic strains (Cvi and Ler) over time in response to darkness, then to the change in response when light is introduced. …

Production Of Black And Navy Beans In Virginia, Harbans L. Bhardwaj, Satya S. S. Narina Ph.D.

Virginia Journal of Science

An urgent need exists in Virginia and adjoining states to identify crops to replace declining tobacco acreage. Although not traditionally grown in the region, dry beans (Phaseolus vulgaris L.) have considerable potential as alternative summer crops due to their nutritional benefits and increasing consumer demand. Information on the production potential of these crops in Virginia, however, is not yet available. To remedy this situation, replicated field trials were conducted over three years with six black and four navy bean varieties to characterize grain yields following three row spacings and three planting times. Black beans significantly out-yielded navy beans (2095 …

Agronomic Practices For Climate-Resilient Okra Production In Agroecological Systems: A Review, Samuel Mathu Ndungu, Lokeshwar Kesamreddy, Mathieu A.T. Ayenan, Stephen Othim, Siyabusa Mkuhlani, Yu Hsiang Liu, Amha Besufkad, Wubetu Bihon Legesse, Eric C. Legba, Judith Honfoga, Lukas Pawera

All Peer-Reviewed Publications

Okra is increasingly recognized as a climate-resilient crop within diversified agroecological systems; however, an integrated synthesis of its biophysical, agronomic, and socioeconomic dimensions is lacking. This review consolidates the current knowledge on okra physiology, production ecology, and value chains, with a focus on climate resilience under heat, drought, salinity, pest, and disease pressures. Evidence across regions demonstrates that agroecological practices such as crop diversification, mulching, conservation tillage, integrated pest management, and the use of organic and biological inputs consistently improve soil health, stabilize yields under climatic stress, and reduce dependence on external inputs, although with trade-offs in labor demand and …

Genome Wide Association Study (Gwas) On Different Economic Traits And Epigenetic Stability Of Sweetpotato In Louisiana, Ajay Dhungana

LSU Doctoral Dissertations

Sweetpotato [Ipomoea batatas (L.) Lam] is a globally important food, feed, and industrial crop, yet its improvement is constrained by a complex hexaploid genome, clonal propagation, and susceptibility to multiple diseases. In Louisiana, production is threatened primarily by Fusarium oxysporum f. sp. batatas (Fusarium wilt) and Ceratocystis fimbriata (Black rot). Furthermore, the in vitro propagation methods essential for disease-free planting material and germplasm conservation can introduce epigenetic instability that undermines clonal fidelity. This dissertation integrates genome-wide association studies (GWAS), genotype by environment interaction (GEI) and DNA methylation profiling to dissect resistance mechanisms and assess epigenetic stability in Louisiana sweetpotato …

Integrative Effects Of Mycorrhizal Fungi, Azotobacter, And Azospirillum With Different Nitrogen Levels On Morphophysiological Responses And Drought Tolerance Of Maize (Zea Mays L.) ‘Sc706’ Under Varying Water Deficit Conditions, Nozar Shamohammadi, Mahdi Zare, Korosh Ordookhani, Farshid Aref, Shahram Sharafzadeh

The Philippine Agricultural Scientist

Under drought stress, soil fertility declines sharply, restricting nutrient availability and reducing plant productivity. This study evaluated the effects of mycorrhiza, Azotobacter, and Azospirillum combined with nitrogen on the morpho-physiological traits of maize (Zea mays L.) hybrid SC706 plants under different water deficit conditions. The experiment was conducted at a research field in Fars Province, Iran, over 2 consecutive years (2017–2018, 2018–2019) and applied a split-split plot design based on a Randomized Complete Block Design (RCBD) with 3 replicates. It assessed the effects of the 3 biological fertilizers in 4 treatment groups (Control [B1], inoculation with mycorrhiza alone …

The Dual Nature Of Weedy Rice (Oryza Sativa F. Spontanea): From A Noxious Weed To An Important Genetic Resource For Rice Improvement, Rica M. Rentino, Vanessa Sernicula, May O. Palanog, Roselyn G. Alfetche, Dan Michael A. Angay, Francis L. Tejada, Dexter G. Balboa, Shaireen M. Angay, Fatima-Nasra A. Sahadain, Teodora E. Mananghaya, Karl Vincent J. Jose, Liezel C. Llanes, Jonathan M. Niones, Karla Mae R. Nonog, Frodie F. Waing, Leonilo Gramaje, Albert Christian S. Suner, Ommal H. Abdulkadi, Norvie L. Manigbas, Jose E. Hernandez, Alvin D. Palanog

The Philippine Agricultural Scientist

Weedy rice (Oryza sativa f. spontanea) is becoming a serious threat to rice production in the Philippines, especially in direct-seeding rice areas, owing to its high competitiveness and its similarity to cultivated rice in morphology and ecological requirements. However, weedy rice can be considered both a threat that endangers rice production and an opportunity, as it offers a potential source of novel genes for rice improvement. This study evaluated the extent of weedy rice infestation in direct-seeding areas in the Visayas, measured the phenotypic and genotypic diversity of collected weedy rice ecotypes using simple sequence repeat (SSR) markers, and …

Improvement Of Forage Productivity By Intercropping Pakchong 1 And Napier Grass With Mungbean And Soybean In Los Baños, Laguna, Philippines, Paul Joshua C. Marquez, Eureka Teresa M. Ocampo, Menandro M. Loresco, Lourdes S. Edano Ma, Agapita J. Salces

The Philippine Agricultural Scientist

Forage demand is rising in the Philippines, and to sustainably boost agronomic performance, the beneficial impact of intercropping was investigated. This study characterized the performance of high-yielding forages, namely Napier grass (NG) and Pakchong 1 (PK), when intercropped with soybean (SB) and mungbean (MB) under rain-fed conditions in Los Banos, Laguna. The experiment was conducted in a repeated-measures RCBD replicated 3 times with grass species and cropping system as main factors, resulting in the following treatment combinations: Sole NG, Sole PK, NGSB, NGMB, PKSB, and PKMB. Grasses were ratooned, legumes were harvested, and legume seeds were re-sown every 45 to …

Integrative Effects Of Mycorrhizal Fungi, Azotobacter, And Azospirillum With Different Nitrogen Levels On Morphophysiological Responses And Drought Tolerance Of Maize (Zea Mays L.) ‘Sc706’ Under Varying Water Deficit Conditions, Nozar Shamohammadi, Mahdi Zare, Korosh Ordookhani, Farshid Aref, Shahram Sharafzadeh

The Philippine Agricultural Scientist

Under drought stress, soil fertility declines sharply, restricting nutrient availability and reducing plant productivity. This study evaluated the effects of mycorrhiza, Azotobacter, and Azospirillum combined with nitrogen on the morpho-physiological traits of maize (Zea mays L.) hybrid SC706 plants under different water deficit conditions. The experiment was conducted at a research field in Fars Province, Iran, over 2 consecutive years (2017–2018, 2018–2019) and applied a split-split plot design based on a Randomized Complete Block Design (RCBD) with 3 replicates. It assessed the effects of the 3 biological fertilizers in 4 treatment groups (Control [B1], inoculation with mycorrhiza alone …

Improvement Of Forage Productivity By Intercropping Pakchong 1 And Napier Grass With Mungbean And Soybean In Los Baños, Laguna, Philippines, Paul Joshua C. Marquez, Eureka Teresa M. Ocampo, Menandro M. Loresco, Ma Lourdes S. Edano, Agapita J. Salces

The Philippine Agricultural Scientist

Forage demand is rising in the Philippines, and to sustainably boost agronomic performance, the beneficial impact of intercropping was investigated. This study characterized the performance of high-yielding forages, namely Napier grass (NG) and Pakchong 1 (PK), when intercropped with soybean (SB) and mungbean (MB) under rain-fed conditions in Los Banos, Laguna. The experiment was conducted in a repeated-measures RCBD replicated 3 times with grass species and cropping system as main factors, resulting in the following treatment combinations: Sole NG, Sole PK, NGSB, NGMB, PKSB, and PKMB. Grasses were ratooned, legumes were harvested, and legume seeds were re-sown every 45 to …

Spatial Variability Of Nitrates And Nitrogen Mineralization Kinetics And Their Effects In Long-Term Tillage Systems, Bibash Rokaya

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Nitrogen (N) and water management are essential for water quality protection and crop production. However, soil N and water are spatiotemporally variable. Soil water spatial dependencies are described in the literature with known associations with preferential flows among other factors. In contrast, a knowledge gap exists on the spatial dependence of soil N mineralization kinetics. We hypothesize that soil N mineralization kinetics and soil water have distinct and cross-correlated spatial characteristics among soil management practices and climatic regions. For the field study, we measured soil-N mineralization kinetics, volumetric water content (VWC), and a suite of soil properties along ~70 m …

Evaluation Of Publicly Available Maize Germplasm Adaptation To Environments In Nebraska, Garrett Snodgrass

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Publicly available maize germplasm represents an important resource for breeding programs seeking to expand genetic diversity and improve hybrid performance. However, effective use requires characterization of per se phenotypic performance of parental lines and evaluation of the parental line’s hybrid progeny adaptation to a given target population of environments. Furthermore, understanding population structure and heterotic grouping is imperative for maximizing efficiency of breeding decisions. The objectives of this study were to (1) evaluate phenotypic performance of parental lines and hybrids across environments in Nebraska, and to (2) refine heterotic group classification of parental lines within the University of Nebraska-Lincoln’s Hybrid …

Weather Conditions Associated With Citrus Canker Incidence Caused By Aw Strain In The Lower Rio Grande Valley Of South Texas, Amit Sharma, Teresa Patricia Feria-Arroyo, George Yanev, Madhurababu Kunta

School of Integrative Biological & Chemical Sciences Faculty Publications

Citrus canker, caused by bacterium Xanthomonas citri subsp. citri (Xcc), affects the citrus industry by making the fruit unmarketable due to unsightly lesions on the fruit. Citrus canker caused by a relatively new AWstrain of Xcc was reported on the citrus trees in the residential areas of the Lower Rio Grande Valley (LRGV) of South Texas. Xcc AW has a limited host range, predominantly affecting limes and a few other citrus species. Previous work has reported prevailing environmental conditions that influence the incidence and spread of the citrus canker caused by the Asiatic A strain. However, no information is available …

Soil Nutrient Sufficiency Versus Plant Nutrient Status In Compost-Amended Soils: Plant Tissue Analysis As A Diagnostic Tool, Chandralekha Joga Miss

Murray State Theses and Dissertations

This study evaluated whether Mehlich III soil nutrient sufficiency ratings reliably predict plant nutrient status and chlorophyll response across contrasting compost application histories. A greenhouse pot experiment was conducted with Chijimisai (Brassica rapa) planted in three treatment soils that had no compost (T1), moderate compost history (T2), and long-term hog manure compost application (T3). Plant performance was assessed through weekly shoot length and chlorophyll content (SPAD) measurements, leaf number at maturity, and leaf tissue nutrient analysis conducted at harvest. Soil test results indicated adequate to high nutrient levels across all three treatments. Leaf tissue analysis, however, revealed substantial …

An Analysis Of Systemic And Contact Herbicide Usage Trends In Illinois Corn Production Systems, Paige E. Mckittrick

Murray State Theses and Dissertations

Herbicide use is central to weed management in Illinois corn production; however, long-term changes in the balance between systemic and contact herbicides have not been well quantified at the statewide scale. This study analyzes herbicide trends in Illinois corn from 1982 to 2016 using secondary data from the USDA Agricultural Chemical Use Survey, paired with climate, regulatory, and herbicide resistance information. Herbicide active ingredients were classified into systemic and contact functional categories and grouped according to Weed Science Society of America (WSSA) mode-of-action (MOA) codes. For each survey year, total herbicide load (lb a.i./acre), functional proportions, MOA-specific contributions, and a …

Effects Of Compost Incorporated Versus Surface Applied On Soybean Yield And Soil Health, Maheshwari Kuchanapally

Theses and Dissertations

Compost application is increasingly recognized as a sustainable soil management practice that enhances soil health and crop production. However, the method of application, incorporated versus surface applied, may influence its effectiveness in improving soil properties and crop productivity. This study evaluated the effects of compost application method on soybean (Glycine max L. Merr.) yield and soil health at Illinois State University Research Farm in Lexington, Illinois, across two growing seasons, 2024 and 2025. The 2024 experiment used a Completely Randomized Design comparing incorporated versus surface-applied compost (n = 4; 8 plots). The 2025 experiment used a Randomized Complete Block Design …

Evaluating Soil And Plant Health In A Wide-Row Maize (Zea Mays L.) Production System Integrated With Perennial Cover Crops And Turkey (Meleagris Gallopavo), Sovika Bhattarai

All Graduate Theses, Dissertations, and Other Capstone Projects

In regions dominated by intensive maize (Zea mays L.) production systems, such as the US Midwest, sustainable agricultural practices such as cover crops and livestock integration are gaining interest for their potential to improve soil, plant, and environmental health. Traditionally, annual cover cropping systems (ACCs) have been used to maintain soil quality and crop performance without compromising ecosystem services. However, the high establishment and management costs of ACCs highlight the need for alternative approaches, such as perennial cover crops (PCCs). Grown as companion crops with maize, PCCs provide extended soil cover and can improve soil biochemical properties (e.g., total C …

Impacts Of Management Practices And Soil Properties On Free-Living Nitrogen Fixation In Eastern South Dakota, Laura Galvan Nuevo

Electronic Theses and Dissertations

Free-living nitrogen (N) fixation (FLNF) may represent a sustainable pathway to supplement crop N demand in agroecosystems, yet edaphic and management factors regulating this process under field conditions remain poorly understood in the Northern Great Plains. Using 15N2 direct method to quantify potential FLNF (pFLNF) and baseline FLNF (bFLNF), this thesis investigates how crop rotations (2-, 3-, and 4-year systems), tillage management (conventional vs. no-till), cover cropping, and soil properties affect the potential of free-living diazotrophs to supply N via FLNF in a long-term no-till corn-based system in Southeastern South Dakota. A two-year field study evaluated pFLNF across four growing …

Wa Insecticide Guide 2026 - Winter Spring, Svetlana Micic, Cindy L. Webster, Rebecca Severtson

PestFacts WA

Registered chemicals for broadacre crops in Western Australia.

The insecticides listed in the tables within this guide can be used on any crop appearing on the chemical label, if the rate used does not exceed the highest rate that is registered for use on that crop.

There are many products with different trade names that contain the same active ingredient. This list is not exhaustive and does not imply any specific recommendations of brand names.

Unless otherwise specified, all insecticides listed are emulsifiable concentrates (EC). Other insecticide formulations are suspension concentrate (SC), wettable powder (WP), capsule suspension (CS), wettable granules …

Hydroponics In The Classroom: Cultivating Plants, Captivating Young People, Stacy A. Adams, Christian Stephenson, Theresa James, Kim Todd

Department of Agronomy and Horticulture: Faculty Publications

Few students take the initiative to pursue coursework beyond that required for progression to graduation. Limited are opportunities that connect educational content to industry application, potentially inspiring young people towards impactful careers. The United States government has emphasized the importance of STEM education to ensure national security and to maintain economic competitiveness globally. STEM education is not a defined discipline but an approach for building knowledge through application and engagement. Developing and managing a hydroponics prototype provides numerous opportunities for embedding STEM content into a fun and interactive project. This poster provides inspiration for constructing a simple deep water culture …

Assessment Of Soybean Response To Irrigation Variability In Eastern Nebraska Using The Aquacrop Model, Anmol Singh, Saleh Taghvaeian, Yufeng Ge, Derek M. Heeren, Frank Bai

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Soybean [Glycine max (L.) Merr.] is a major irrigated crop in eastern Nebraska, where recent expansions in irrigated agriculture and projected trends in irrigation demand necessitate thorough investigations of approaches that can optimize its irrigation management. In this study, the AquaCrop model was calibrated and validated using 19 variable irrigation treatments from a five-year field experiment. The model accurately simulated canopy cover, soil water content, and grain yield, with validation normalized root mean square error (nRMSE) of 12%, 7%, and 7%, respectively. The model was subsequently applied to estimate soybean yield and water requirement during a 15-year period (2010–2024) …

Kentucky Bluegrass (Poa Pratensis L.) As A Perennial Groundcover: Establishment And Weed Management In Corn, Kiera S. Searcy

Theses and Dissertations--Plant and Soil Sciences

Perennial groundcover (PGC) systems offer a cost-effective alternative to annual cover crops, by providing continuous soil cover, reducing soil erosion, and contributing to integrated weed management (IWM) in corn (Zea mays L.) production systems. Kentucky bluegrass (Poa pratensis L.) has been proposed as a perennial groundcover for corn due to its low growth habit and seasonal dormancy; however, successful adoption is limited by challenges associated with establishment-phase weed competition and compatibility with weed management programs during corn production. The objectives of this research were to (1) evaluate weed management strategies that support Kentucky bluegrass establishment and (2) assess …