The effect of conservation tillage practices on the losses of phosphorus and herbicides in surface and subsurface drainage waters

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Authors

Gaynor, J.
Bissonnette, D.

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Agriculture Canada

Abstract

Part A: Soil erosion, phosphorus losses and corn yield - Conservation tillage with residue management is considered the best management practice in Ontario to control soil erosion from agricultural land. However, little is known about the effects of conservation tillage on nutrient losses from level plane, poorly drained soil. Because Brookston clay loam is the predominant soil type under intensive agriculture in Essex County, a study was initiated to compare soil and nutrient losses from three tillage practices. Part B: Herbicides - The research reported herein was developed to provide data on herbicide losses from conventional, zero and ridge tillage practices for corn culture on a poorly drained, level plane soil. Total transport losses, seasonal distribution and the source (surface runoff or tile discharge) of losses were measured for the three tillage practices for atrazine, its dealkylated analog, des-ethylatrazine and metolachlor. The dissipation of these chemicals in the soil was also followed.

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Keywords

Archive of Agri-Environmental Programs in Ontario, Soil and Water Environmental Enhancement Program, SWEEP, conservation tillage, tillage practice, residue management, soil erosion, nutrient loss, herbicide loss, total transport loss, atrazine

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