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Variations in Picloram Leaching Patterns for Several Soils¹

ABSTRACT

Laboratory studies of picloram (4-amino-3,5,6-trichloropicolinic acid) leaching under saturated conditions were conducted for four soils. Leaching patterns could be related to variations in soil texture and pore uniformity for three soils from arid and semiarid regions. Diffusion from conducting pores into adjacent micropores appeared to be the most plausible explanation of leaching patterns obtained for an Oxisol of volcanic origin from Hawaii. Evidence supporting the presence of the postulated micropore structure in this tropical soil was obtained from constancy in flow rate, from scanning electron micrographs, and from picloram recovery at a reduced leaching rate.

¹ Contribution from the Dept. of Agronomy and Soils, Washington State Univ., Pullman, 99163. Scientific Paper No. 4267. College of Agriculture Research Center, Project No. 1811. Research conducted under Western Regional Research Project W-82.

² Graduate Research Assistant and Associate Professors of Soils, respectively.

Received for publication September 27, 1974. Accepted for publication January 7, 1975.