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: solubility of phosphate, iron, and calcite in a flooded rice environment and the effect of common soil solution constituents on the precipitation of calcium phosphate
  name:
    name part: Baker, William Holt.
    role:
      role term: creator
  name:
    name part: Hossner, Lloyd R.
    role:
      role term: degree supervisor.
  name:
    name part: Loeppert, Richard H.
    role:
      role term: degree committee member.
  name:
    name part: Turner, Fred T.
    role:
      role term: degree committee member.
  name:
    name part: Zwolinski, Bruno J.
    role:
      role term: degree committee member.
  name:
    name part: Texas A & M University
    role:
      role term: degree granting institution.
  type of resource: text
  genre: bibliography
  genre: Academic theses
  origin info:
    place:
      place term: xx
    date issued: 1987
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiv, 132 leaves : illustrations, map ; 29 cm
  abstract: The objective of this study was to investigate the solubility of phosphorus, iron, and calcium carbonate in flooded soil. Soil solutions were collected and analyzed for the major inorganic solution constituents. Solubility products were calculated. Field studies found that the concentration of phosphate in the solution did not increase from the addition phosphorus fertilizer. Rice yields also reflected this trend. Ion activity products (IAP) suggested that hydroxyapatite and variscite were being formed or in equilibrium with soil solution phosphate. At the pH levels maintained by the acid soil, solution aluminum and phosphorus concentrations were near or in equilibrium with variscite. This was also true for several of the calcareous soil solutions. IAP values approached equilibrium, and in some cases became oversaturated, with respect to hydroxyapatite as the time of flood increased for the higher pH levels maintained by the calcareous soil. An investigation of possible causes for hydroxyapatite oversaturation revealed that the precipitation of calcium phosphate was significantly inhibited by the presence of Mg, Na, citric acid, and tartaric acid at concentrations as low as 0.5 mM. IAP values calculated for calcite were approached the solubility activity product constant (Ksp) of calcite with increasing solution pH. IAP values were near saturation or supersaturated with respect calcite where the acid soil solution pH values were highest. Solubility calculations for the calcareous soil revealed a trend toward increasing oversaturation with respect to the Ksp of calcite as solution pH increased. Nodules (glaebules) present in the calcareous soil were found to be predominately calcite with only minor Mg-carbonate substitution and Fe staining. While various solution compounds are known to disrupt calcite precipitation, the greatest influence on the observed solubility of calcite in the soils studied appeared to be due to higher alkalinity levels as a result of flooding …
  note: Typescript (photocopy).
  note: Vita.
  note: Ph. D. in Soil Science Texas A & M University 1987
  note: Includes bibliographical references (leaves 106-115).
  subject:
    topic: Phosphates
    topic: Solubility
  subject:
    topic: Phosphatic fertilizers
  subject:
    topic: Rice
    topic: Soils
  subject:
    topic: Major soil science
  identifier: http://proxy.library.tamu.edu/login
  identifier: https://hdl.handle.net/1969.1/DISSERTATIONS-767676
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: https://hdl.handle.net/1969.1/DISSERTATIONS-767676
  record info:
    record content source: TXA
    record creation date: 890215
    record change date: 20220104090515.0
    record identifier: in00000743028
    language of cataloging:
      language term: eng