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Published in Agron J 59:413-415 (1967)
© 1967 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Factors Affecting the Persistence of Picloram in Soil1

M. G. Merkle, R. W. Bovey and F. S. Davis2

The effect of soil type, temperature and moisture on the persistence of 4-amino-3,5,6-trichloropicolinic acid (picloram) was determined using vapor phase chromatographic analyses and plant bioassays. Detectable quantities of picloram were present in Houston clay, Axtell sandy loam, and commercial sand after incubation for 1 year, at 4, 20, and 38 C and at moisture levels of field capacity and 0.1 field capacity from rates as low as 0.25 #g per g (1/2 lb/A). Movement studies indicated that leaching was an important means of dissipating the herbicide in light soils. Photodecomposition may also be important if the herbicide remains on the soil surface for long periods of time.

Key Words: bioassay • chromatography • pesticide • photodecomposition

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture and Texas A&M University, College Station, Texas. This research is sponsored by the Advanced Research Projects Agency, Department of Defense.

2 Associate Professor, Texas A&M University; Research Agronomist and Research Plant Physiologist, Crops Research Division, Agricultural Research Service, USDA.

Received for publication March 8, 1967.




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The SCI Journals Crop Science Vadose Zone Journal
Journal of Natural Resources
and Life Sciences Education		 Soil Science Society of America Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1967 by the American Society of Agronomy.