Title:
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Characterizing Phosphorus Loss in Surface Runoff: Impact of Source, Application Method and Wetting-Drying Cycles |
Author:
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Kodaolu, Busayo
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Department:
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School of Environmental Sciences |
Program:
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Environmental Sciences |
Advisor:
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O'Halloran, Ivan |
Abstract:
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Previous studies have shown greater risk of Phosphorus (P) loss from commercial fertilizer (CF) than manure especially when they are surface applied. The P losses from soils of varying texture amended with either CF or manure at rates comparable to agronomic recommendation for CF was studied. Manure represented a greater and steady source of dissolved P to runoff. In addition, surface-placed P presented the greatest risk of P losses to runoff, while a subsurface band was a much better option of placing P except where efficient P source burial was restricted. The importance of post-application soil moisture condition prior to runoff on P losses was also examined. Exposing the soils to wetting and drying cycles increased the potential for dissolved P losses compared to when the soils were always wet. Selection of on-farm P management strategies should target appropriate P sources, rate, placement and timing while considering the soil’s properties. |
URI:
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http://hdl.handle.net/10214/16073
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Date:
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2019-05 |
Rights:
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Attribution-NoDerivatives 4.0 International |
Terms of Use:
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