The rate of inactivation of 2,4-dichlorophenoxyacetic acid in soil varied according to the moisture content of the soil during storage; the highest level used (30%) resulted in most rapid inactivation. 2. Inactivation of 2,4-D in soil also increased with the temperature at which the mixtures were stored, the most rapid inactivation occurring at 70⚬ F., the highest temperature used. 3. Applications of 2,4-D that were mixed into the soil were inactivated during a shorter period of time than were like amounts applied to the soil surface. 4. Light applications of manure to soil low in organic matter materially hastened the inactivation of 2,4-D. 5. The inactivation of 2,4-D in soil was significantly reduced by autoclaving.
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Brown et al. (1948) studied this question.