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Field Persistence Studies with the Herbicide Glufosinate‐Ammonium in Saskatchewan Soils
Author(s) -
Smith Allan E.,
Belyk Murray B.
Publication year - 1989
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1989.00472425001800040013x
Subject(s) - loam , soil water , glufosinate , ammonium , leaching (pedology) , chemistry , nitrification , environmental chemistry , metabolite , agronomy , nitrogen , environmental science , soil science , glyphosate , biology , biochemistry , organic chemistry
Field plots on clay at Regina and Indian Head, and on clay loam at White City, Sask., were treated with glufosinate‐ammonium (the ammonium salt of DL ‐homoalanin‐4‐ylmethylphosphinic acid) at a rate of about 1kg ha −1 during June or July 1988. At regular intervals, soil samples were taken from the 0‐ to 10‐cm and 10‐ to 20‐cm soil levels and extracted and analyzed gas chromatographically for glufosinate remaining. In addition, amounts of the soil metabolite MPPA [3‐(hydroxymethylphosphinyl)propionic acid] were also monitored. Providing there was adequate moisture, breakdown of the herbicide was rapid with no glufosinate detectable in any of the soils by the end of September 1988. In all soils the breakdown of MPPA was slower than that of glufosinate. Maximum amounts of the metabolite formed in the soils ranged from 0.26 kg ha −1 in the clay loam to 0.52 kg ha −1 in the clay at Regina. By the end of September there were 0.23, 0.06, and 0.17 kg ha −1 of MPPA in the 0‐ to 10‐cm soil level at Regina, White City, and Indian Head, respectively. There was no leaching of either glufosinate or MPPA to soil depths below 10 cm.