Journal of Food, Agriculture and Environment

Behaviour of metazachlor applied with additives in soil: Laboratory and field studies

Author(s):

Mariusz Kucharski ^*, Jerzy Sadowski

Recieved Date: 2011-06-30, Accepted Date: 2011-10-09

Abstract:

The aim of the present study was to determine the influence of an addition of adjuvants on behavior of metazachlor in soil – residues, degradation rate and leaching into the soil profile. Experiments were carried out in field and laboratory conditions. Metazachlor was applied alone and in mixture with three different adjuvants: oil, surfactant and multicomponent (dedicated to preemergence application). Metazachlor residue was analyzed using GC/ ECD. At harvest time, in soil samples taken from plots where metazachlor was applied alone, the residue amounted to 0.0072 mg kg^-1. The addition of adjuvants caused an increase of metazachlor residues (0.0082–0.0108 mg kg^-1). The adjuvant addition caused a slowdown of leaching of herbicide into soil profile. Moreover the addition of oil and surfactant adjuvants slowed down the degradation of metazachlor in soils. The DT₅₀ values for mixture metazachlor + oil and surfactant adjuvants were about 8-16 days higher in comparison with the DT₅₀ for metazachlor applied alone (26 days). No significant differences were observed between degradation rates and the DT₅₀ for metazachlor applied alone and with multicomponent adjuvant.

Keywords:

Adjuvant, degradation rate, herbicide, residue, leaching, metazachlor, soil

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Journal: Journal of Food, Agriculture and Environment
Year: 2011
Volume: 9
Issue: 3&4
Category: Environment
Pages: 723-726

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