Polyacrylamide as a tool for controlling sediment runoff and improving infiltration under furrow irrigation

Ross, C.W. and Sojka, R.E. and Lentz, R.D. (1996) Polyacrylamide as a tool for controlling sediment runoff and improving infiltration under furrow irrigation. In: Proc. Soil Science - Raising the Profile. Australia-Melbourne (University of Melbourne), 1996/07/01-04. 2 pp.

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Abstract

Water-soluble anionic polyacrylamide (PAM) has been shown to be effective in controlling topsoil erosion, preventing sedimentation of waterways, and simultaneously improving infiltration rates for furrow irrigation in the western USA (Lentz et al. 1992; Lentz and Sojka 1994). PAM injected as a pulse into the irrigation stream as the water advances has a stabilizing effect on the surface soil in the furrow. Controlling sediment runoff under intensive irrigation has the dual advantage of conserving fertile topsoil and reducing downstream pollution from sediments in waterways, particularly suspended sediments. Topsoil losses of 5 - 50 tonnes ha' yr 4 have been reported from irrigated fields on erodible soils in the US Pacific Northwest. Polymers provide farmers with a practical and economic management tool for conserving soil and preventing sedimentation of waterways from irrigated fields. Increased net infiltration, which translates to more efficient water use, is a secondary benefit, especially for semiarid and arid environments where water supplies are limited. Results from field experiments on a highly erodible Portneuf silt loam (Durixerollic Calciorthid) in southern Idaho are presented comparing the efficacy of three different molecular weights of PAM for controlling sediment runoff and infiltration rates. Some potential environmental impacts of PAM applications under furrow irrigation are briefly discussed.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 0927
Subjects: Irrigation > Furrow irrigation > Infiltration > Polyacrylamide
Irrigation > Furrow irrigation > Runoff losses > Sediment
Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Infiltration management
Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Runoff
Mass Import - autoclassified (may be erroneous)
Depositing User: Michelle Wayment
Date Deposited: 20 Nov 2010 21:56
Last Modified: 22 Nov 2016 22:09
Item ID: 921
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/921

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