Distribution of imidacloprid in soil following subsurface drip chemigation

Agricultural producers in semi-arid regions of the US are increasingly using surface and subsurface drip irrigation to improve the efficiency of water use. Subsurface drip irrigation can also be used to apply fertilizers and pesticides. At a site in an experimental hop yard in Washington State, imid...

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Bibliographic Details
Published in:Bulletin of environmental contamination and toxicology 1998-03, Vol.60 (3), p.363-370
Main Authors: Felsot, A.S, Cone, W, Ruppert, J.R
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Applied sciences
Biological and medical sciences
Biological and physicochemical properties of pollutants. Interaction in the soil
Ecosystem
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Imidacloprid
Imidazoles - analysis
INSECTICIDAS
INSECTICIDE
INSECTICIDES
Insecticides - analysis
LEACHING
LESSIVAGE DU SOL
LIXIVIACION
Neonicotinoids
Nitro Compounds
Pollution
RESIDU
RESIDUES
RESIDUOS
Soil and sediments pollution
Soil and water pollution
Soil Pollutants - analysis
Soil science
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Summary:Agricultural producers in semi-arid regions of the US are increasingly using surface and subsurface drip irrigation to improve the efficiency of water use. Subsurface drip irrigation can also be used to apply fertilizers and pesticides. At a site in an experimental hop yard in Washington State, imidacloprid residues in the soil profile were monitored under subsurface irrigation. Leaching was determined below the emitter zone under daily irrigation without consideration of soil-moisture conditions. Results showed that, over time, very low concentrations of the pesticide were occasionally recovered in the 0 6 cm and 6 12 cm soil layers. Imidacloprid spread downward from the emitter zone during the first two weeks after application, but after one and two months, imidacloprid concentrations were highest in the soil layer directly above the emitters. The pesticide was found to have leached significantly below the emitter depth due, presumably, because irrigation timing was not coordinated with the evapotranspiration rate.
ISSN:0007-4861
1432-0800
DOI:10.1007/s001289900635