M. Kucharski, J. Sadowski
2009
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0
Influential Citations
16
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Journal
Polish Journal of Agronomy
Abstract
The aim of the present study was to determine the infl u- ence of an addition of adjuvants on behaviour of phenmedipham in agricultural environment - residues in soil, plant, degradation rate and leaching into the soil profi le. Field experiments were conducted during a three-year -period from 2006 until 2008 on ar - able fi elds located in South-Western Poland. Chemical weed con- trol in sugar beet was carried out by commercial formulation of phenmedipham. The herbicide was applied alone and in mixture with adjuvants (oil and surfactant). Phenmedipham residues were analysed using high performance liquid chromatography with UV detection. At lifting time, in soil samples taken from plots where phenmedipham was applied alone, the residues amounted to 0.0082-0.0128 mg kg -1 . In sugar beet roots samples, the resi- dues of phenmedipham were lower than in soil and amounted to 0.0032-0.0084 mg kg -1 . The addition of adjuvants caused an in- crease of the active substance (a.s.) residues in soil and roots of sugar beet. The residues of phenmedipham determined in roots did not exceed acceptable values MRLs (Maximum Residue Lev- els). The addition of oil adjuvant reduced the degradation rate of phenmedipham in soil. No signifi cant differences were observed between degradation rates for phenmedipham applied alone and with surfactant adjuvant. The DT 50 value for mixture phen- medipham + oil adjuvant was about 1