Browsing Theses by Supervisor "Macrae, Merrin"
Now showing items 1-12 of 12
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Edge of Field Vegetated Buffers as a Potential Source of Dissolved Phosphorus over the Non-Growing Season in Cold Climates
(University of Waterloo, 2023-04-26)Phosphorus (P) rich runoff from agricultural landscapes are a major contributor to freshwater eutrophication issues. To intercept this runoff before it reaches waterways, vegetated buffer strips (VBS) are often employed ... -
Effects of Hydroclimatic Drivers and Tillage Practices on Runoff Generation and Phosphorus Losses Through Drainage Tiles from Agricultural Fields with Sandy Loam Soils
(University of Waterloo, 2016-03-21)Effluent from agricultural tile drains has been identified a source of phosphorus (P) to water bodies, contributing to algal blooms and water quality degradation. Reduced till (RT) or no-till are Best Management Practices ... -
Effects of Land Use and Hydrophysical Drivers on Temporal and Spatial Variability of Phosphorus and Nitrate Export in an Agricultural Subwatershed in Southern Ontario, Canada
(University of Waterloo, 2018-01-18)The eutrophication of streams and lakes has been a long recognized problem in North America, particularly in Lake Erie where harmful and nuisance algal blooms have had many deleterious effects on aquatic ecosystems. Non-point ... -
Evaluation of Controlled Tile Drainage on Limiting Edge of Field Phosphorus Losses in a Clay Soil in a Cold Agricultural Region
(University of Waterloo, 2022-01-25)This study examined edge of field (EOF) discharge and phosphorus (P) losses from a Brookston clay soil in a cold agricultural region over four years and quantified the influence of controlled tile drainage (CD) on seasonal ... -
Hydrology and Nutrient Biogeochemistry of Shallow Pond-Peatland Complexes, Hudson Bay Lowlands
(University of Waterloo, 2018-06-25)Across the circumpolar north, the degradation of permafrost in tundra and peatland landscapes has resulted in significant changes to land cover, including an increase in the extent of thermokarst landforms. Climatically-driven ... -
Impacts of Climate Change and Controlled Tile Drainage on Water Quality and Quantity in Southern Ontario, Canada
(University of Waterloo, 2018-09-06)Within the Great Lakes region, agricultural non-point source nitrogen (N) and phosphorus (P) contamination contribute to algal blooms and decreased water quality, particularly from tile-drained landscapes. These water ... -
Impacts of freeze-thaw processes on phosphorus release from a variety of cover crop species in a temperate climate
(University of Waterloo, 2018-04-30)Cover crops (CC) are grown by farmers as an agricultural best management practice (BMP) to improve soil health during the non-growing season (NGS), and potentially reduce soil erosion. Some managers have cautioned against ... -
Phosphorus Responses to Soil Moisture in Southern Ontario Agricultural Soil
(University of Waterloo, 2022-04-29)Agricultural landscapes are known to increase phosphorus (P) losses to waterways, contributing to the eutrophication of freshwater surface water bodies. In cold agricultural regions, the nongrowing season drives annual P ... -
Potential and Observed Release of Phosphorus from Crop Residue and Cover Crops Over the Non-growing Season in a Cool Temperate Region
(University of Waterloo, 2016-10-11)Maintaining crop residue or cover crops on fields during winter is a recommended Best Management Practice (BMP) in temperate regions. However, losses of phosphorus (P) to runoff have been attributed to vegetation following ... -
Preferential flowpaths and fertilizer placement influence subsurface P transport across soil textures and seasonal conditions
(University of Waterloo, 2018-12-14)Agricultural tile drains are a source of phosphorus (P) contributing to eutrophication. Preferential flowpaths can rapidly transport P to tile drains, but their activation in different soil textures and under variable ... -
Runoff Response and Nutrient Loading in Vertisolic Clay Soils of Near-Level Artificially Drained Southern Manitoban Landscapes
(University of Waterloo, 2020-03-04)The installation of tile drainage systems in Southern Manitoba has been accelerating over the past two decades to improve crop production. Given current environmental and political concerns related to agricultural pollution ... -
The use of a filter product to remove phosphorus from surface runoff in agricultural fields
(University of Waterloo, 2021-09-28)Nutrient losses from agricultural fields are the largest sources of phosphorus (P) entering the Great Lakes in North America. Research has suggested that multiple conservation practices (CPs) used together (stacked) are ...