RSS 1.0Colleges, Departments, and Organizations
ABOUT THE COLLECTIONS
Several University of Arizona organizations, such as colleges, departments, research and administrative groups, have established collections in the UA Campus Repository to share, archive and preserve unique materials.
These materials range from historical and archival documents, to technical reports, bulletins, community education materials, working papers, and other unique publications.
QUESTIONS?
Please contact Campus Repository Services personnel repository@u.library.arizona.edu with your questions about items in these collections, or if you are affiliated with the University of Arizona and are interested in establishing a collection in the repository. We look forward to working with you.
Sub-communities within this community
Recent Submissions
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Advancing U.S. Cotton IPMThis 2024 Better Cotton Large Farm GIF project evaluated six highly hazardous pesticides (HHPs) used in U.S. cotton and advanced integrated pest management (IPM) strategies to reduce reliance on broadly toxic insecticides. Through key informant surveys representing over 10 million cotton acres, pesticide use analyses, and regulatory risk assessments, we assessed current use patterns, pest targets, and barriers to phase-out. Five of the six HHPs were used on less than 5% of acres on average, with no predicted yield losses if discontinued. Fenpyroximate showed minor potential impacts (<0.1%) under specific mite resistance scenarios. Chlorpyrifos presented comparatively greater ecological and occupational risks, supporting accelerated phase-out. We also recommend transitioning from aggregate annual pesticide reporting to field-level spray records to better measure progress in pest management. Commercial-scale on-farm demonstrations in Arizona showed that predator-based thresholds eliminated the need for whitefly sprays without economic loss, demonstrating that conservation biological control can reduce pesticide inputs while sustaining productivity.
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Silage Corn Yield, Water Productivity, and Quality Under Different Irrigation Scenarios in ArizonaCorn (Zea mays L.) is one of the most cultivated crops in the United States, covering about 86.5 million acres, representing about 17% of the total land area (514.93 million acres) devoted to corn worldwide (Our World in Data, 2023). In 2024, corn was cultivated on 70,000 acres in Arizona, with 50,000 acres devoted to silage corn, producing approximately 1,350,000 tons (Food and Agriculture Organization of the United Nations, 2025). Silage corn in Arizona requires a substantial amount of water, especially during the reproductive growth stages (Payero et al., 2006). Depending on weather, irrigation methods, and crop management practices, silage corn may require 16 to 30 acre-inches of water per season (Andales and Schneekloth, 2017) and is typically harvested at the dent, R5 reproductive stage, when whole-plant moisture reaches about 60-70%. Harvesting at this stage maintains silage quality and digestibility while minimizing yield losses (Lauer, 2016; Roth and Heinrichs, 2001). In consideration of water scarcity and the necessity for water conservation, the implementation of deficit irrigation strategies in arid and semi-arid regions, aligned with crop growth stages and their respective sensitivity to water stress, can enhance on-farm management practices by reducing irrigation water consumption, diminishing evaporation losses, minimizing energy consumption, and increasing economic returns from investments in irrigation water supplies (Elsadek et al., 2023, 2025; Elshikha et al., 2024). Furthermore, improving soil quality through accurate estimation of the salt leaching fraction and soil amendments may enhance soil structure and increase water retention capacity, thereby contributing to higher crop yields (Elshikha et al., 2025). on irrigation water management, silage corn yield, water productivity, and quality under different irrigation methods, rates (80% and 100% of calculated crop evapotranspiration, ETc), and soil conditions: A soil amendment (a), Liquid Natural Clay (LNC), provided by the Desert Control Company (https://www.desertcontrol.com, accessed on 20 November 2025), that was evaluated for its effects on soil moisture retention and yield and compared to an unamended control. The findings will guide growers to make informed decisions to enhance silage corn yield, water productivity, and quality in Arizona, USA.
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Investigating Soil Health Changes After Irrigation Sanitizer Application in Desert Southwest Production Systems: A Guide to Soil HealthThis is the first in a series of articles evaluating soil health in agricultural systems that utilize pre-harvest irrigation water treatments. The purpose of this first installation is to define soil health and how it is measured, prior to the following installations which will describe the soil health status of fields after treatment
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Quantifying and Comparing Crop Water Productivity in Organic vs. Conventional Iceberg Lettuce, Yuma, AZThis study quantified Crop Water Productivity (CWP) in organic and conventional iceberg lettuce systems at the University of Arizona Yuma Agricultural Center during the 2024–2025 season. Both systems were managed under subsurface drip irrigation using sensor-based and traditional irrigation scheduling strategies. Results showed that conventional lettuce produced about 40–50% more yield per unit of crop evapotranspiration than the organic system; this difference may be related to differences in crop growth and nutrient availability. While short-term CWP was higher under conventional management, organic systems may enhance soil structure, water-holding capacity, and infiltration over time; however, these soil changes were not measured in this single-season study. Sensor-based irrigation scheduling in most cases improved irrigation water-use efficiency across both systems, demonstrating that precision irrigation technologies can help Yuma growers make better use of water resources. Combining precision irrigation with organic farm practices that focus on soil management and improving soil properties offers a promising path toward sustaining productivity and conserving water in Yuma’s desert agriculture.
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Nine Common Reasons Your Hens Aren't LayingReduced egg production often reflects normal biological stages, health conditions, or environmental stressors rather than a single isolated problem. Understanding these influences helps flock owners assess age, nutrition, lighting, housing conditions, and overall hen health before assuming a more serious issue. With this knowledge, small-scale producers can make informed management adjustments to support consistent laying and improve overall flock well-being.
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Designing a Virtual XR Farming System: Five Activities for Beginners of Augmented Reality and Virtual RealityRepresenting the “T” in STEM, these five lessons combine agriculture design with augmented and virtual reality tools. By using extended reality (XR), the activities make emerging technologies more accessible for classrooms, school projects, or hands-on exploration.
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Arizona Seasonal Passes for 4-H Large Livestock ProjectsSeasonal Passes are essential for tracking the movement of exhibition livestock and protecting animal health statewide. The Arizona Department of Agriculture (AZDA) requires all Arizona residents who exhibit livestock at shows or the fair to possess a Seasonal Pass.
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Controlling Mosquito Larvae in Urban Drainage Structures in ArizonaMosquitoes are important human disease vectors worldwide. In Arizona, the primary species of concern are Culex tarsalis and Culex quinquefasciatus, both of which can transmit West Nile virus (WNV) and St. Louis encephalitis virus (SLEV). Aedes aegypti is also a common urban vector with the potential of transmitting Zika, chikungunya and dengue viruses, although local transmission in Arizona has been rare. Treatment options for these viruses in humans are limited, so controlling the mosquito vector and reducing human/vector contact remain the best disease prevention strategies. Before they develop into the adult stage, all mosquitoes are aquatic (Fig. 1). Therefore, controlling the mosquito population at the immature (larval) phase is ideal as the mosquitoes are confined to a water source during this stage. Larval control in the water source can be achieved either by removing the source or treating the water with insecticides or biological agents. The goal is to prevent the mosquitoes from reaching the adult stage when they can acquire and transmit pathogens causing human and animals diseases.
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Arizona Agricultural Enterprise Budgets: Yuma County’s 2026 Field Crops’ Production BudgetsThis report estimates the typical economic costs and returns for growing major crops, including alfalfa, barley, cotton, sorghum grain, Sudan grass for seed, durum wheat, and winter wheat in Yuma County, Arizona. The Arizona Agricultural Enterprise Budgets are estimated based on a representative farm and its related cropping operations in a determined location; numbers are reported on a per-unit basis.
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Lighting Schedules for Arizona Backyard Laying FlocksMaintaining steady egg production in backyard flocks requires understanding how changes in daylight length influence a hen’s natural laying cycle. It’s a common misconception that cold temperatures in the wintertime lead to decreased egg production. In fact, light exposure, or photoperiod, stimulates egg production through the pineal gland and the decreased daylight length in the winter is responsible for drops in egg production. This article explores effective lighting strategies to optimize egg production, ensure consistency, and meet the needs of hens at different life stages.
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New Federal Reporting Requirement for Small Businesses: Beneficial Ownership InformationOwning a small business comes with many challenges and among those challenges is the requirement to file forms and reports to various governmental entities. Effective January 1, 2024, there is yet another reporting requirement that has recently become a requirement for many small businesses. The Beneficial Ownership Information (BOI) reporting was implemented by the Financial Crimes Enforcement Network (abbreviated FinCEN), an arm of the U.S. Department of the Treasury, to capture information about small businesses who oftentimes “fly under the radar” when it comes to reporting their business ownership, activities, and revenues. In 2021 the U.S. Congress pass the Corporate Transparency Act. This law creates a new reporting requirement as part of the United States government’s attempt to make it harder for bad actors to hide income or benefit from ill-gotten gains through nontransparent ownership structures. This Act is aimed at catching money launderers and those who fund terrorism, however all small business owners must be aware that they might be required to file a BOI Report (BOIR).
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Colorado River Summary & UpdateThis article, published in the VegIPM Newsletter (Vol. 17, No. 3), provides an update on the status of the Colorado River, including declining flows, reservoir conditions, and ongoing water management negotiations affecting the Southwest.
