Dissipation and Residues of 2,4-d-dimethylammonium in Wheat and Soil

Abstract

The environmental behavior of 720 g/L 2,4-d-dimethylammonium AS under wheat field conditions was studied in detail. The dissipation behaviors of 2,4-d-dimethylammonium in wheat and soil were fitted to first-order kinetic equation (C = C ₀ e ^−λt). But different experimental points and years have different initial deposits and half-lives (T _1/2). After applying 720 g/L 2,4-d-dimethylammonium AS at recommended dosage and 1.5-fold recommended dosage during 3–4 leaf stage, the residues of 2,4-d-dimethylammonium in wheat plant, wheat grain and soil were all lower than 0.02 mg/kg. The obtained results suggested that, it is safety for application at the recommended dosage during 3–4 leaf stage to control weeds in wheat field.