Environmental Fate of the Herbicide MCPA in Two Soils as Affected by the Presence of Wheat Ash

Hiller, Edgar; Bartaľ, Mikuláš; Milička, Ján; Čerňanský, Slavomír

Environmental Fate of the Herbicide MCPA in Two Soils as Affected by the Presence of Wheat Ash

2009

Hiller, Edgar | Bartaľ, Mikuláš | Milička, Ján | Čerňanský, Slavomír

This study was conducted to evaluate the environmental fate processes of the herbicide (4-chloro-2-methylphenoxy)acetic acid (MCPA) in agricultural soils in the presence and absence of ash originating from the burning of wheat residue. The ash-amended soils (1% ash by weight) were approximately 8-16 times more effective than the ash-free soils in sorbing MCPA. The desorption results showed that 40-78% of initially sorbed MCPA were desorbed in both soils, depending on the initial MCPA concentration in solution. Addition of ash to soils decreased the desorption of MCPA by approximately 20%. Degradation of MCPA was substantially reduced in the presence of the ash. A 6-week incubation resulted in 50-85% of MCPA microbially degraded in ash-amended soils, as compared to >85-100% in ash-free soils under the same conditions.

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