Fate of Glyposate in a Sandy Loam Soil and Analysis for Residues in Field-Grown Crops
Stiles, David A., 1938-
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Following application in the spring to a sandy loam soil, residues of glyphosate (N-phosphonomethyl glycine) decreased rapidly and degraded into aminomethylphosphonic acid which also was short lived. Analysis for glyphosate and its metabolite as their methyl trifluoroacetate derivatives was by the flame specific phosphorus gas chromatography. Glyphosate and its metabolite in the soil at 1, 10, 19, 29, 52, 86 and 122 days after application was 69.5, 29.6, 22.1, 14.1, 11.7, 4.2 and 0.0% and 2.3, 31.0, 35.2, 24.0, 15.0, 9.4 and 6.1%, respectively, of the 4.25 kg a.i./ha applied. Neither compound was found in field-grown barley, oat, wheat, sweet corn, beans, peas, red beet or carrots. No injury symptoms were observed on any of the crops during the growing season.