The effect of herbicides on their active ingredient residues in soybean seeds.

Experimental material consisted of the seeds of Polan, Aldana and Dornburg soybean cultivars harvested from the field experiments in 1990-92 at Sandomierz with the following herbicides and doses: Sencor 75 WP (1.0 and 2.0 kg/ha), Tribunil 70 WP (1.0 and 2.0 kg/ha), Azogard 50 WP (1.5 and 3.0 kg/ha), Afalon 50 WP (1.0 and 2.0 kg/ha). Seeds from plots treated with a single dose of some herbicides (Tribunil 70 WP, Afalon 50 WP) did not exhibit any herbicide active residues or in case of other herbicides their level were far below permissible limits (0.1 mg/kg). The use of double doses, resulted in accumulation of the active remnants in soybean seeds but still their level did not exceed permissible limits. Differences in the level of herbicide active substances in soybean seed were found to depend on season conditions.