• Soil Organic Matter

      Fuller, Wallace H. (College of Agriculture, University of Arizona (Tucson, AZ), 1969-05)
    • Soil Organic Matter

      Fuller, Wallace H. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-03)
    • Soil Sampling and Analysis

      Walworth, J. L. (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-10)
    • Soil Sampling and Analysis

      Walworth, James; Soil, Water & Enviromental Science (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2006-07)
      Soil testing is comprised of four steps: Collection of a representative soil sample, laboratory analyses of the soil sample, interpretation of analytical results, and management recommendations based on interpreted analytical results.
    • Soil Structure: The Roles of Sodium and Salts (PowerPoint)

      Walworth, James (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-10)
    • Sonic Pest Repellents

      Aflitto, Nicholas; DeGomez, Tom (College of Agriculture, University of Arizona (Tucson, AZ), 2014-10)
      Commercially available sonic pest devices for use in residential applications have not been shown to be effective in scientific studies. For this reason, use of these devices is not advised to treat common pest problems. Although some researchers are developing sonic techniques that illustrate promise for very specific pests, these technologies are yet to be commercially available. As our understanding increases of how pest species receive and process sound, more relevant sonic devices may be developed. The allure of sound as a treatment for pests will remain into the future—motivated by the fact that if they are successful they will be more environmentally friendly and safer for humans.
    • Sooty Canker

      Olsen, Mary W.; Young, Deborah; Plant Pathology (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2011-01)
      Sooty canker causes cankers and dieback in tree branches. This article briefly explains the host, symptoms, environmental conditions, disease and preventing / controlling method for sooty canker.
    • Sorghums in Arizona

      George, Donald W.; Ellwood, Charles C. (College of Agriculture, University of Arizona (Tucson, AZ), 1954-06)
    • Spray Compatibility Chart of Insecticides and Fungicides

      Draper, Fred (College of Agriculture, University of Arizona (Tucson, AZ), 1934-11)
    • Spray Compatibility Chart of Insecticides and Fungicides

      Draper, Fred (College of Agriculture, University of Arizona (Tucson, AZ), 1936-04)
    • Sprinkler Irrigation

      Schwalen, H. C.; Frost, K. R. (College of Agriculture, University of Arizona (Tucson, AZ), 1965-03)
    • Sprinkler Irrigation in Arizona

      Halderman, A. D.; Frost, K. R. (College of Agriculture, University of Arizona (Tucson, AZ), 1968-12)
    • A Study of Irrigation Requirements of Southwestern Landscape Trees

      Schuch, Ursula; Martin, Edward C. (College of Agriculture, University of Arizona (Tucson, AZ), 2017-07)
      Trees are an important component of our landscapes, providing many benefits from shade to cleaning the air. Large, mature trees provide the greatest benefits in urban landscapes compared to smaller, younger trees and it is therefore important to ensure that trees in our urban forests receive the amount of water they need to develop into healthy, mature specimens.
    • Sudangrass Hay Production in the Irrigated Deserts of Arizona and California

      Knowles, Tim C.; Ottman, Michael J. (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 1997-12)
    • Sudangrass Hay Production in the Irrigated Deserts of Arizona and California

      Knowles, Tim C.; Ottman, Michael J. (College of Agriculture, University of Arizona (Tucson, AZ), 2015-05)
      Foreign sudangrass hay buyers want dust-free hay with a bleached light green color and a stem diameter less than one quarter of an inch. Two types of sudangrass hybrids are currently grown in the United States: true sudangrass hybrids and sorghum-sudan hybrids. Sudangrass and related hybrids are annual warm season grasses grown for pasture, green chop, silage, and hay. Sudangrass produces well on all soil types, however best yields are obtained on well-drained, deep loam soils that have a high capacity to absorb and hold water. Sufficient nitrogen should be applied at planting to ensure establishment of the crop and hasten development. Typically, 40 to 80 pounds of actual nitrogen per acre are suggested at planting, based on results from a preplant nitrate-nitrogen soil test. This should be followed by split applications of 60 to 120 pounds actual nitrogen per acre in irrigation water following each cutting. Harvest sudangrass when it is at least 18 to 24 inches tall at the first cutting. Nitrates present in hay crops are considered toxic to many classes of livestock. Most cases of hydrocyanic or prussic acid poisoning are caused by the ingestion of plants that contain cyanogenetic glucosides. Cyanogenetic glucoside itself is non-toxic but hydrocyanic acid.
    • A Summary of Livestock Grazing Systems Used on Rangelands in the Western United States and Canada

      Howery, Larry D.; Sprinkle, James E.; Bowns, James E. (College of Agriculture, University of Arizona (Tucson, AZ), 2016-12)
      The objectives of this article are to provide an overview of the major grazing systems that have been used on rangelands in the western U. S. and Canada, to summarize the conditions under which they may be applicable, and to highlight examples from the southwestern U. S. when relevant. Revised 12/2014. Originally published 09/2000.
    • Summer Cover Crop Use in Arizona Vegetable Production Systems

      Wang, Guangyao (Sam); Noite, Kurt; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-07)
      Summer cover crops can add nitrogen to the soil, build up and maintain soil organic matter, suppress pest populations, mitigate soil erosion, and reduce nutrient leaching when they are used in Arizona vegetable systems. However, careful management is required since cover crops can modify the availability of soil nitrogen and other critical nutrients. The ratio between carbon to nitrogen (C:N) in decomposing cover crop biomass is a critical indicator of the overall process of breakdown and eventual release of nutrients. This article introduces five cover crops that could improve vegetable systems in Arizona. The mixtures of a legume and a non-legume cover crop species can also be planted to obtain desired C:N ratios to optimize the benefits of cover crops.
    • Summer Slump in Alfalfa

      Ottman, Michael; Mostafa, Ayman; School of Plant Sciences, University of Arizona (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2014-01)
      “Summer slump” is a decline in growth of alfalfa usually beginning in July in areas where maximum daily temperature exceeds 100 °F, such as the low elevation deserts of Southwestern U.S (Fig. 1). In more temperate regions, there is a gradual decrease in alfalfa yield in successive harvests throughout the year, but the yield decline in the summer is not as sharp as in hot summer regions. The term summer slump has also been applied to reduction in growth of perennial cool season grasses such as tall fescue during the summer.
    • Things to Know About Applying Precision Agriculture Technologies in Arizona

      Andrade-Sanchez, Pedro; Heun, John T.; Agricultural & Biosystems Engineering (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2010-12)
      In this publication, we will make the case of what Precision Agriculture (PA) technologies can do to enhance the productivity of farming systems, with particular attention to the case of irrigated agriculture in the semi-arid Arizona. This guide is intended to aid growers to select the right technology when considering the need to acquire new, or upgrade existing equipment.
    • Timing the First Post-plant Irrigation

      Silvertooth, J.C.; Brown, Paul W.; Husman, Steven H.; Martin, Ed; Plant Sciences, School of (College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2001-02)