The aim of present investigation was to evaluate the influence of lowrates
application on herbicide residues in soil and roots of sugar beet. Chemical
weed control in sugar beet was applied at recommended and reduced (about 50
and 66%) doses of herbicides including substances such as: phenmedipham,
desmedipham, ethofumesate, metamitron, triflusulfuron and oil adjuvant applied
4 times at 7- to 10-day intervals starting at the onset of weed emergence. Samples
of soil and roots of sugar beet were taken at the day of lifting. Phenmedipham,
desmedipham and ethofumesate residues were analysed using HPLC with
UV-detection. Metamitron residues were analysed using GLC with ECD detection.
At lifting time, in soil samples, where recommended herbicide doses were applied,
the residues of separate active substance of herbicides amounted from 0.0056
to 0.0124 mg.kg-1. Sum of all detected residues of applied substances amounted
0.0323-0.0373 mg.kg-1. In sugar beet root samples, the residues amounted
respectively 0.0011 to 0.0085 mg.kg-1and 0.0085-0.0224 mg.kg-1. Application of
the reduced doses by about 50% influenced on a significant decrease of residues
about 38-50% average. For samples, where reduction of herbicide dose amounted
66%, the decrease of residues level, in comparison with results obtained at
recommended doses, was statistically significant and amounted 69-77% average.
Residues of active substances determined in roots of sugar beet did not exceed
EU acceptable limits.
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