Fate of 2,4-D as affected by soil properties and landscape position.

摘要

The objectives of this study was to determine the spatial variability of soil properties and 2,4-dichlorophenoxyacetic acid (2,4-D) sorption and mineralization within an agricultural field near Miami, Manitoba. The data were also used to determine the effect of soil properties on 2,4-D sorption and mineralization in soil.; Variability of soil properties within soil-landscapes affects herbicide sorption and degradation by soil. Therefore, the spatial variability of soil properties in different landscape position and their effects on 2,4-D sorption and mineralization must be taken into consideration in order to accurately predict the fate of 2,4-D in agricultural fields. The result of this study suggest that some weed management strategies such as the application of soil-residual herbicides may require some adjustments to account for the effects of SOC content and soil pH in different landscape position of the agricultural field to achieve improved weed control or/and reduced risk of herbicide off-site movement. Therefore, this study provides important information to the scientific community as well as producers to established a science-based management practices of herbicide application to achieve effective weed control while minimizing off-site movement of 2,4-D. (Abstract shortened by UMI.)