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:
    title: Microbial activity as a tool for assessing agricultural soil
  name:
    name part: Haney, Richard Lee.
    role:
      role term: creator
  type of resource: text
  genre: bibliography
  origin info:
    place:
      place term: xx
    date issued: 2001
    issuance: monographic
  language:
    language term: eng
  physical description:
    form: print
    extent: xiii, 143 leaves : illustrations ; 28 cm.
  abstract: A rapid soil testing procedure for soil C and N mineralization that is both rapid and precise is needed. The rapid procedure is based on the quantity of CO₂-C evolved for 24 hours under optimum laboratory conditions following the rewetting of dried soil and is strongly correlated with N mineralization. Results of the one-day CO₂ procedure were highly correlated with soil N mineralized from samples collected in March for 1995 and 1996 (p=0.004, p<0.001) and forage N uptake (p<0.001) for both years of the study near Stephenville, Texas. Residual inorganic N in the same soil samples was poorly correlated with soil N mineralization and forage N uptake. Herbicides applied to soils potentially affect soil microbial activity. The objective of this study was to determine the impact of glyphosate on soil microbial biomass and activity across a wide range of soils. Glyphosate significantly stimulated soil microbial activity as measured by C and N mineralization, as well as soil microbial biomass. Strong linear relationships between C and N mineralized, as well as between soil microbial C and N (r² = 0.96, 0.95), respectively. Glyphosate appeared to be rapidly degraded by soil microbes regardless of soil type or organic matter content, even at high application rates, without adversely affecting microbial activity. Methods of determining soil microbial biomass need to be reliable and produce consistent results across soils with a wide range of properties. Extraction efficiency of 0.5 M K₂SO₄ relative to water was dependent upon soil pH. Changes in microbial biomass estimates with changes in extractant molarity and soil pH suggest that chloroform fumigation-extraction may not be reliable in a wide range of soils.
  note: by Richard Lee Haney.
  note: Vita.
  note: "Major Subject: Soil Science".
  note: Issued also on microfiche from University Microfilm Inc.
  note: Ph. D. Texas A&M University 2001.
  note: Includes bibliographical references (leaves 129-142).
  subject:
    topic: Major soil science
  identifier: 30-20046 UMI
  identifier: http://proxy.library.tamu.edu/login
  related item:
    location:
      url: http://proxy.library.tamu.edu/login
  record info:
    record content source: TXA
    record creation date: 020513
    record change date: 20190325103116.0
    record identifier: in00001679903