Mobility and dissipation of metalaxyl in tobacco soils

Soil thin layer chromatography studies showed that metalaxyl (methyl-N-(2,6-dimethylphenyl)-N-(2-methoxyacetyl)alaninate) was similar to 2,4-D and more mobile than pyrazone > permethrin. Soil column studies indicated that approximately 0, 9, 73 and 83% of the applied fungicide leached through a 2...

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Bibliographic Details
Published in:Canadian journal of plant science 1986-07, Vol.66 (3), p.761-771
Main Authors: Sharom, M.S, Edgington, L.V
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Animal, plant and microbial ecology
Applied ecology
Biological and medical sciences
Ecotoxicology, biological effects of pollution
Fundamental and applied biological sciences. Psychology
fungicides
Soil and water pollution
Soil science
soil treatment
Terrestrial environment, soil, air
transport processes
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Summary:Soil thin layer chromatography studies showed that metalaxyl (methyl-N-(2,6-dimethylphenyl)-N-(2-methoxyacetyl)alaninate) was similar to 2,4-D and more mobile than pyrazone > permethrin. Soil column studies indicated that approximately 0, 9, 73 and 83% of the applied fungicide leached through a 25-cm soil column after being subjected to 5, 10, 15 and 20 cm of simulated rainfall, respectively. A study on the effects of sequential periods of rain and dry spells on movement of metalaxyl showed that the fungicide was leached with each 5 cm simulated rainfall but moved upward during the dry cycle. There was no leachate from soil columns that received four increments of 5 cm of simulated rainfall alternated with a 48-h drying cycle. However, approximately 32% of the applied metalaxyl was leached through soil columns that received similar rainfall treatment alternated with a 24-h drying cycle. Field plot studies indicated that most of the soil-incorporated metalaxyl remained in the upper 0–30 cm, with approximately 10% being leached into the 30- to 45-cm zone. The half-life of metalaxyl in soil from field plots and six growers’ farms ranged from 3 to 5 wk. Metalaxyl acid, a possible metabolite, was not detected in any of the soil samples. Metalaxyl and its acid were not detected in either the water or sediment of Big Creek which drains the tobacco region.Key words: Metalaxyl, mobility, persistence, environmental contamination
ISSN:0008-4220
1918-1833
DOI:10.4141/cjps86-094