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Dinuba, CA, United States
Dinuba, CA, United States

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Markle J.C.,CURES | Watson T.E.,CURES | Prichard T.L.,University of California Cooperative Extension | Klassen P.,CURES
ACS Symposium Series | Year: 2011

This study examined the effectiveness of sediment basins for reducing sediment and pyrethroid residues in tailwater in two different trials conducted on a section of a large-scale commercial orchard in the Central Valley of California planted with nonpareil almonds. The first trial was conducted under typical tailwater flow conditions with no PAM added to the irrigation water. The second trial was conducted under slightly higher flow rates with PAM added at the point of irrigation input resulting in a five-fold reduction in total suspended solids (TSS) entering the sediment basin. In both trials, the total mass of the sediment leaving the sediment basin was reduced 79%-84% at the discharge point of the basin. Although PAM did not appear to significantly impact the total mass of pyrethroid leaving the field in this study, the sediment basin reduced the total pyrethroid load by 38%-61%. © 2011 American Chemical Society.


The use of polyacrylamide (PAM) and sediment basins have long been recognized as effective management practices for reducing pesticide and sediments in drainage water from irrigated agriculture. Their effectiveness has been confirmed by many independent studies. This study examined transport of pyrethroids and sediment from tomato fields under two sets of conditions representing a wide range of sediment transport potential. The study results show that management practices that reduce water and sediment from the field (e.g. PAM and more careful irrigation flow control) and also technologies that remove sediment from edge of field tail waters (e.g. sediment basins) are also effective in reducing pyrethroid transport, with reductions of up to 80 % demonstrated in these trials. © 2011 American Chemical Society.

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