Residues of picloram in soil and their effects on crops

Ragab, M.T.H.

Candian Journal of Soil Science 55(1): 55-59


DOI: 10.4141/cjss75-008
Accession: 000182229

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When 4.48 kg/ha (2 p.p.m.) of picloram as the K salt was incorporated with soil to a depth of 15 cm, some 1.86, 1.78, 1.32, 0.70, 0.28, 0.12 and 0.02 p.p.m. were detected 18, 63, 145, 337, 504, 690 and 843 days after application, respectively. Growth of carrots, parsnips and table beets was inhibited when these crops were planted in a greenhouse in soil containing 1.32 p.p.m. picloram and collected 145 days after application. The year after application, when soil sampled about a month before planting contained 0.70 p.p.m., beans, parsnips and Swiss chard did not grow. Picloram residue some 1055 days after application was 2.5 p.p.b. when determined by a bioassay using beans as the indicator plant.