• Integrating Variable Rate Technologies for Soil-applied Herbicides in Arizona Vegetable Production

      Nolte, Kurt; Siemens, Mark C.; Andrade-Sanchez, Pedro; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-02)
      Precision herbicide application is an effective tool for placing soil incorporated herbicides which have a tendency for soil adherence. And while field implementation depends on previous knowledge of soil textural variability (soil test and texture evaluations), site-specific technologies show promise for Arizona vegetable producers in non-uniform soils. Regardless of the method used for textural characterization, growers should keep in mind that textural differences do not change in the short/medium term, so the costs associated with defining texture-based management zones can be spread over many years.
    • An Introduction to the Use of Reference Strips for N Management in Durum Wheat

      Wang, Guangyao (Sam) (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2012-05)
    • Irish Potato Growing in the Irrigated Valleys of Pima County

      Brown, C. B. (College of Agriculture, University of Arizona (Tucson, AZ), 1926-10)
    • Irrigating in Arizona

      Turville, E. S.; Hitch, Donald L. (College of Agriculture, University of Arizona (Tucson, AZ), 1944-06)
    • Irrigation Interval Effect on Yield and Quality of Forage Sorghum at Maricopa, AZ, 2015

      Ottman, Michael J; Diaz, Duarte E; Sheedy, Michael D; Ward, Richard W (College of Agriculture, University of Arizona (Tucson, AZ), 2017-02)
      Sorghum has the advantage compared to corn in that it uses less water and fertilizer, but feeding quality of sorghum is usually less than corn. The purpose of this research is to compare the yield and quality of sorghum grown with differing frequency of irrigation water application. Forage sorghum was grown at the University of Arizona Maricopa Agricultural Center with irrigation intervals of 1, 2, and 3-weeks corresponding to 76, 44, and 37 inches of applied water. Forage yield at 72% moisture was 20.6, 18.8, and 16.5 tons/acre for the 1-, 2-, and 3-week irrigation intervals, respectively. Forage quality in terms of milk per ton of forage was not affected by irrigation interval, but some differences were measured in certain components of feed quality. Forage yield profit was maximized at the 2-week irrigation interval due since the increased water cost of the 1-week interval was not compensated by the yield increase at this irrigation frequency.
    • Irrigation of Small Grains in Arizona

      Ottman, Michael; Husman, Steve; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2004-09)
      Water use, critical soil water depletion, and irrigation scheduling for wheat and barley are explained in this publication.
    • Irrigation, When? How Much? How?

      Halderman, Allan D. (College of Agriculture, University of Arizona (Tucson, AZ), 1962-01)
    • Irrigation: When? How Much? How?

      Halderman, Allan D. (College of Agriculture, University of Arizona (Tucson, AZ), 1966-03)
    • Johnsongrass Control in Arizona

      Hamilton, K. C.; Heathman, Stanley. (College of Agriculture, University of Arizona (Tucson, AZ), 1968-01)
    • Kill Weeds in Small Grains

      Everson, E. H. (College of Agriculture, University of Arizona (Tucson, AZ), 1954-04)
    • 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.
    • 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.
    • 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.