Adaptation of On-farm Pesticide Rinsate Biobeds to Protect Water Resources from Pesticides

Session: 39. - Managing Agriculture Water and Nutrients - Science Solutions for Tomorrows BMPs

Claudia Sheedy, Agriculture and Agri-Food Canada, [email protected]
Larry Braul, Agriculture and Agri-Food Canada, [email protected]
Sharon Reedyk, Agriculture and Agri-Food Canada, [email protected]

Abstract

As water contamination and scarcity are mounting issues, protecting water resources is crucial. Pesticides are detected in water bodies across Canada and a large proportion of that pesticide contamination likely occurs from point sources such as pesticide handling areas on farms, due to the high concentration of pesticides in formulated products and repeated applications of rinsate at the same location.  Pesticide rinsate biobeds are designed to remove pesticides from sprayers rinsate, using a biomixture of straw, compost and soil. Although used in Europe for decades, the adoption of pesticide rinsate biobeds in North America is lagging. Five biobeds of various designs were built and used in the Prairie region of Canada, and their pesticide removal efficiency assessed.  Biobeds received up to 43 pesticides annually, and removed on average 96% of the mass of pesticides applied. Three pesticides recalcitrant to removal were identified: clopyralid, bentazone and imazapyr. All biobeds performed well under the various pesticide use regimen and climatic conditions, and no significant decline in pesticide removal (aging) was observed over a two year-period. Results indicate that pesticide rinsate biobeds are an efficient option for Canadian growers to reduce the risk of water contamination by pesticides at the farm.

1. Keyword
pesticides

2. Keyword
water quality

3. Keyword
mitigation