Effects of Tillage Practices and Manure Application on Phosphorus Transport in Tile Drain Effluent Under a Silt Loam Soil in Ontario, Canada
This thesis is an investigation of the relationship between different forms of P that are found in tile drain effluent following the summer/fall application of liquid dairy manure on three different tillage systems during the period of 2014 to 2015. Three plots were used, each associated with a different tillage system (conventional and minimum till). Tile water samples were taken during flow periods and were analyzed for total P (particulate + dissolved) and soluble reactive P. Results provide evidence that conventional tillage may be effective in disturbing the continuity of macropores and essentially reducing the drainage rates of the soil. Following manure application, there was an increase in SRP identified in the conventional till plot, indicating that minimum till may be effective in reducing the amount of SRP leaving the field during the first few flow periods following manure application.