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Thesis (M.S.)—University of Nebraska—Lincoln, 1971. Department of Agronomy.


Copyright 1971, the author. Used by permission.


Picloram (4-amino-3,5,5-trichloropicolinic acid) dissipation was studied in two soil types in the laboratory and under field environmental conditions where herbicide leaching was prevented. The importance of picloram loss by volatilization when soil samples were allowed to dry was investigated. A liquid scintillation counting solution was developed for direct counting of 14C-picloram treated soil, and soil adsorption of picloram was studied.

Observations indicate that picloram is quite mobile in soil water but has little tendency to move in the vapor state. When kept near the soil surface (upper 6 inches), loss of phytotoxic properties occurs, at least during the summer months. The extreme phytotoxic properties of this important herbicide warrant continuing research efforts to allow us to more efficiently utilize its potential in such a manner to minimize possible subsoil and groundwater contamination.

Advisor: Terry L. Lavy