• Laboratories Conducting Soil, Plant, Feed, or Water Testing

      Schalau, Jeff; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-05)
      This sheet contains the mailing information for the labs that conduct soil, plant, feed or water testing.
    • Laboratories Conducting Soil, Plant, Feed, or Water Testing

      Schalau, Jeff W.; Univ Arizona, Coll Agr & Life Sci (College of Agriculture, University of Arizona (Tucson, AZ), 2016-09)
      This publication lists laboratories that provide soil, plant, feed, and water testing within the state of Arizona. Revised September 2016.
    • Late Season N Application Method Effect on Grain Protein, 2016

      Ottman, Michael J; Sheedy, Michael D; Ward, Richard W (College of Agriculture, University of Arizona (Tucson, AZ), 2016-11)
      Nitrogen fertilizer is normally applied later in the season around flowering time to boost grain protein content. The purpose of this study is to determine if the grain protein boost provided by late N application is affected by method of application. A trial testing late season N application methods was conducted at the Maricopa Ag Center in the 2016 growing season. The crop was grown 211 lb N/acre in split applications until flowering when 35 lb N/acre was applied as UAN32 in the irrigation water (fertigation), as low biuret urea in a foliar application, or as urea granules compared to no N application at all at flowering. In this study, we were not able to detect a difference in grain protein or any other variable measured due to the late N application method. We did measure a 0.4% increase in grain protein regardless of late season N application method compared to the control with no late N applied.
    • Leaching for Maintenance: Factors to Consider for Determining the Leaching Requirement for Crops (AZ

      Watson, Jack; Soil, Water & Enviromental Science (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1999-05)
      As a result of the application of irrigation water containing soluble salts, a salt load is continually added to the soil. Soil salts have to be removed on an ongoing basis through maintenance leaching to prevent yield losses from a salinity buildup. This publication provides factors to consider for determining the leaching requirement for crops.
    • Lesquerella: A Winter Oilseed Crop for the Southwest

      Wang, Guangyao (Sam); McCloskey, William; Foster, Mike; Dierig, David; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-07)
      Lesquerella (Lesquerella fendleri) is a member of the mustard family and is native to the southwestern United States and northern Mexico. The oil in lesquerella seeds has superior performance compared to castor, soybean, and rapeseed methyl esters in reducing wear and damage in fuel injected diesel engines. Lesquerella can also be used as an ingredient for a number of other bioproducts such as lubricants, motor oils, plastics, inks, and adhesives. The hydroxylated oil in lesquerella is similar to castor oil but does not contain the deadly poison ricin. Therefore, lesquerella is a safer alternative to castor in the United States and can be handled both at the farm level and the oilseed processing level with industry standard equipment and technology. This article provide information to growers in planting, water and nutrient management, pest management, and harvesting of lesquerella as a potential alternative crop.
    • Lettuce Injury from Preplant and Preemergence Herbicides

      Tickes, Barry R.; Soil, Water & Environmental Science (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1996-08)
    • Lodging Control for Wheat and Barley in Arizona

      Ottman, Michael; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-03)
      Plant growth regulators are commonly applied to wheat and barley grown under high-yielding conditions to reduce the risk of lodging. Plant growth regulators reduce lodging by reducing plant height and strengthening the stem.
    • Low Desert Citrus Varieties

      Maurer, Michael; Bradley, Lucy; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1998-04)
      When choosing a variety of citrus to plant in your yard consider: what you like to eat; when you want to harvest; and how cold it gets in your yard. There are many varieties of species of citrus, each with its own characteristics. This publication lists the characteristics of some of the most popular varieties of citrus.
    • Making Sorghum Sirup

      Ballantyne, A. B. (College of Agriculture, University of Arizona (Tucson, AZ), 1917-11)
    • Management of Fertilizer Nitrogen in Arizona Cotton Production

      Silvertooth, J.C.; Norton, E. Randall; Ayala, Felix; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-01)
      Nitrogen (N) is the nutrient that is required most consistently and in larger amounts than other nutrients for cotton production. Common rates of fertilizer N applied in Arizona cotton production systems range from 50 to over 300 lbs N/acre. The management of fertilizer N is critical, both for insuring optimum cotton yields, and minimizing the potential for environmental contamination.
    • Measuring Water Flow and Rate on the Farm

      Martin, Edward; Agricultural & Biosystems Engineering (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2009-01)
      Proper water management involves two basic considerations: when and how much irrigation water to apply. The amount of water applied to a field is a function of time, flow, and area. The time of an irrigation is easily recorded. The amount of area irrigated is also easily calculated. Estimating flow rate in an open ditch is often guess work, at best. This publication discusses ways to measure water flow in an open ditch.
    • Measuring Water Flow and Rate on the Farm

      Martin, Edward C. (College of Agriculture, University of Arizona (Tucson, AZ), 2014-10)
      Proper water management involves two basic considerations: when and how much irrigation water to apply. The timing of an irrigation event (the when) involves utilizing information on plant needs and soil water conditions. How much depends primarily on the soil’s water holding capacity, the depletion level and the rooting depth of the crop. Once you have calculated how much water to apply, how can you be sure that you have accurately applied that amount? Or, if you miss your target amount, how do you determine how much water you actually applied? The amount of water applied to a field is a function of time, flow and area. The time of an irrigation is easily recorded. The amount of area irrigated is also easily calculated. However, estimating flow rate in an open ditch is often guess work, at best. In this bulletin we shall discuss ways to measure water flow in an open ditch.
    • Measuring Water Flow in Surface Irrigation Ditches and Gated Pipe

      Martin, Edward; Agricultural & Biosystems Engineering (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006-08)
      Measuring water is a critical part of any irrigation management system. This informational bulletin gives some simplistic methods of measuring flow rate in an open ditch and in gated pipe. Using the float method, dye tracers and velocity head meters, growers can get a quick estimate of the flow in their farm ditch. From this, an estimate of water applied or a set time can be determined. The bulletin also explains how a propeller meter works for gated pipe. Gated pipe is widely used through the state and in the West.
    • Melon Insect Pest Management in Arizona

      Palumbo, John C.; Kerns, David; Entomology (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1998-06)
      Melon production in the Southwestern United States occurs primarily in the desert growing areas of Arizona, and Southern California. Melons in Arizona are grown in very diverse cropping systems, where a variety of vegetable, agronomic and seed crops are cultivated concurrently throughout the year. Numerous insect species can be found on melon plants, but only a few have been determined to be economically important. This publication discusses several key insects that cause economic damage to melons, and the tactics commonly used to manage infesting populations.
    • Methods of Measuring for Irrigation Scheduling - WHEN

      Martin, Edward C. (College of Agriculture, University of Arizona (Tucson, AZ), 2014-10)
      Proper irrigation management requires that growers assess their irrigation needs by taking measurements of various physical parameters. Some use sophisticated equipment while others use tried and true common sense approaches. Whichever method used, each has merits and limitations. In developing any irrigation management strategy, two questions are common: “When do I irrigate?” and “How much do I apply?” This bulletin deals with the WHEN.
    • Metodos para Medir la Humedad del Suelo para la Programacion del Riego--¿Cuando? (Spanish)

      Martin, Edward; Agricultural & Biosystems Engineering (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-09)
    • Métodos para Medir la Humedad del Suelo para la Programación del Riego ¿Cuándo?

      Martin, Edward C.; Munoz, Carolina (College of Agriculture, University of Arizona (Tucson, AZ), 2017-02)
      El manejo apropiado del riego requiere la evaluación de parte del agricultor de sus necesidades de riego en base a medidas de varios parámetros físicos del suelo. Algunos productores utilizan equipo sofisticado mientras que otros se basan en métodos empíricos o en el sentido común. Cualquiera que sea el método usado, cada uno tiene sus propios méritos y limitaciones. El agricultor generalmente se hace dos preguntas al desarrollar una estrategia para el manejo del riego: “¿Cuándo regar?” y “¿Cuánta agua aplicar?”. Este boletín responde a la pregunta CUÁNDO. Reviewed 2/2017; Originally Published 09/2010.
    • Minimum tillage for wheat following winter vegetables

      Nolte, Kurt; Ottman, Mike; Teegerstrom, Trent; Wang, Guangyao (Sam); Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-08)
      In 2009, over 56,000 acres were planted to wheat in Arizona, all of which following either a lettuce or cotton crop. For wheat grown in the region, the conventional tillage sequence prior to planting can be tied to as many as seven field operations that consume valuable time, labor, and resources. In this study, our aim was to determine the effectiveness of reducing the number tillage (minimum till) operations in fields immediately following lettuce harvest. And demonstrate to Southwest wheat producers a means for conserving time, fuel, and resources. Growing wheat on lettuce beds immediately following lettuce harvest did not significantly reduce grain yield or quality. Although the regrowth of the previous crop can have significant implications for Durum grown with minimum tillage if not managed effectively, lodging was not a significant factor in this study as the degree of lodging was similar in both growing systems. The significant savings in fuel, labor and time, with no apparent reduction in Durum yield or quality, may be a significant benefit to wheat producers who incorporate minimum tillage practices following a lettuce crop.
    • Minimum Tillage in the Southwest

      Harris, Karl; Erie, Leonard J.; Fuller, Wallace H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-02)
    • Mowing Turfgrasses in the Desert

      Kopec, David; Umeda, Kai (College of Agriculture, University of Arizona (Tucson, AZ), 2015-09)
      Describes how to select the appropriate lawn mower to properly mow the species of grass at the correct height for high, medium, or low maintenance levels.