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Sediment-Phosphorus Relations in Surface Runoff from Irrigated Lands

Carter, D.L. and Brown, M.J. and Bondurant, J.A. (1976) Sediment-Phosphorus Relations in Surface Runoff from Irrigated Lands. pp. 3/41-3/52. In: Proc. 3rd Fed. Inter-Agency Sedimentation Conf. USA-CO-Denver, 1976.


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Phosphorus and sediment concentrations were measured in irrigation and drainage waters, and phosphorus and sediment inflows and outflows computed. Relationships between phosphorus and sediment were developed. Total phosphorus and orthophosphate concentrations measured in nonfiltered samples are closely related to the sediment concentration, but dissolved orthophosphate measured in samples filtered through 0.45 µm membrane filters is independent of the sediment concentration. A net sediment inflow was found on one large tract where sediment settles in drains and the amount of surface runoff is low, but a net sediment outflow was found for another tract with steeper drains and from which more surface runoff returned to the river. Net phosphorus inflows were measured on both tracts. Particle size segregation takes place in irrigation and drainage waters whenever the flow velocity is slow enough to allow suspended sediment to settle, and the quantity of phosphorus per unit of sediment remaining suspended increases. Actually, much more phosphorus settles with that portion of the sediment that settles than remains in suspension where sediments are eroded from silt loam or loam soils. Thus, conditions favoring settling are phosphorus conserving conditions.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 0351
Subjects: Irrigation > Furrow irrigation > Runoff losses > Sediment
Irrigation > Furrow irrigation > Runoff losses > Nutrients
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:56
Last Modified: 15 Feb 2017 18:28
Item ID: 938

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