rdf-syntax-grammar
mods:
  schema location: http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
  title info:
    non sort: The
    title: use of gypsum and a coal desulfurization by-product to ameliorate subsoil acidity for alfalfa growth
  name:
    name part: Chessman, Dennis John
    name part: 1956-
    role:
      role term: creator
  name:
    name part: Haby, Vincent
    role:
      role term: thesis advisor.
  name:
    name part: Cothren, Joe Tom
    role:
      role term: thesis advisor.
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: txu
    date issued: 2004
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: remote
    extent: 1 online resource.
  abstract: Acid soils limit the growth of aluminum-(Al) sensitive crops such as alfalfa (Medicago sativa L.). Management of acid subsoils can be difficult due to physical and economic constraints. Field experiments were conducted at two locations to evaluate the effectiveness of surface-applied gypsum and a flue gas desulfurization by-product for reducing the toxic effects of acid subsoils on alfalfa. The materials were applied at rates of 0, 5, 10, and 15 Mg ha-1. In addition, a glasshouse experiment was conducted that used 0, 5, and 10 Mg ha-1 of gypsum only. Field studies were concluded 41 and 45 months after treatment application at the two locations. No effect of material on alfalfa yield or tissue mineral concentration was observed. Also, rate did not affect yield. However, there were differences in plant tissue mineral concentration in several harvests that were related to rate. Soil was sampled periodically to 120 cm and indicated movement of Ca and S into the soil profile to depths of 60 and 120 cm, respectively. Subsoil pHH2O and pHCaCl2 were not affected by treatment. Extractable and exchangeable Al were not reduced by movement of Ca and S into the soil. In the glasshouse study, alfalfa yields and root growth were not affected by gypsum rate. As gypsum rate increased, plant tissue S increased, but K and Mg decreased. Alfalfa roots did not grow below 60 cm, even though there was indication of material movement to 90 cm in the soil. Although sulfur moved to 75 cm, no effect on soil Al was observed. Leachate collected from the bottoms of columns indicated that soil cations were leached as a result of gypsum application. Gypsum and the flue gas desulfurization by-product did not significantly affect the acid soils used in these studies or improve alfalfa growth.
  note: by Dennis John Chessman.
  note: "Major Subject: Agronomy."
  note: Title from author supplied metadata (automated record created on Apr. 30, 2004.).
  note: Vita.
  note: Abstract.
  note: "Major Subject: Agronomy"
  note: Title from author supplied metadata (automated record created on Apr. 30, 2004.)
  note: Electronic resource.
  note: System requirements: Adobe Acrobat Reader.
  note: Ph. D. Texas A & M University 2003.
  note: Includes bibliographical references.
  note: Text (Dissertation).
  subject:
    topic: Major agronomy
  subject:
    topic: alfalfa
  subject:
    topic: soil acidity
  subject:
    topic: gypsum
  subject:
    topic: aluminum toxicity
  identifier: http://hdl.handle.net/1969.1/494
  record info:
    record content source: TXA
    record creation date: 040615
    record change date: 20151026065116.0
    record identifier: in00001762393