Dissipation studies of Boscalid (a carboxamide fungicide) in soils of different textures
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Date
2022-09
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G. B. Pant University of Agriculture and Technology, Pantnagar
Abstract
Boscalid [2-chloro-N-(4'-chlorobiphenyl-2-yl) nicotinamide] is a carboxamide
fungicide used in variety of food crops and turf grasses. It comes under the SDHI group
of fungicides which inhibit the enzyme succinate dehydrogenase ubiquinone (complex
II) which is an important enzyme for energy production in respiratory chain. The
dissipation studies of boscalid was performed in different textural soils at 1 and 2 μg g-1.
The method of extraction of boscalid residue from soil was validated by following
QuEChER’S (Quick, Easy, Cheap, Effective, Rugged and Safe) method and the
quantitative analysis was done by HPLC (High performance liquid chromatography).
Recovery study of boscalid was performed at two concentration of 1 and 2 μg g-1 and the
recoveries obtained ranged from 80.59% to 98.97% in two soils. The dissipation rate of
boscalid did not vary much in the two soils. At lower application rates (1μg g-1) boscalid
dissipated to 96.12% and 97.23% upto 21st day and was below detectable limit (BDL) on
28th day at lower concentration of 1μg g-1 in both the soils. At higher application rates
(2μg g-1) boscalid residue persisted upto 28th day with dissipation upto 98.24% and
98.18% in both the type of soils. It was BDL on 35th and 60th day of fungicide
application. Dissipation of boscalid occurred in a single distinct phase following first
order kinetics. The half life of boscalid ranged from 4.66 and 4.16 days in soil samples A
and B at 1 μg g-1 and 5.22 and 4.73 d in both the soils at 2 μg g-1 application rates.
Boscalid is used in various vegetable, field crops and turf grasses for controlling fungal
diseases and decreasing the economic damage but since it does not persist in subtropical
soils it can be safely applied at recommended dosage in crops and soils.