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Polyacrylamide application to control furrow irrigation-induced erosion

Lentz, R.D. and Sojka, R.E. (1996) Polyacrylamide application to control furrow irrigation-induced erosion. pp. 419-430. In: IECA Proceedings. Erosion Control Technology … Bringing it Home. USA-WA-Seattle, 1996/02/27-03/01.

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Abstract

Furrow-irrigation induced soil erosion threatens sustainable irrigated agriculture worldwide. Small concentrations of a moderate-charge-density anionic polyacrylamide (PAM), dissolved in irrigation water has been used to nearly eliminate soil loss from irrigated furrows and has increased net infiltration (total inflow minus total outflow). This paper summarizes polymer-related field studies conducted on highly erodible Idaho silt loam soils. A range of furrow lengths (163-264 m), slopes (0.5-7%), and inflows (15-38 L min-1) were used in the studies. Field trials compared various PAM application strategies. PAM was applied to irrigation water in gated irrigation pipe as dry granules, or to furrow heads as a stock solution. Treatment efficacy varied primarily with irrigation inflow-rate, PAM concentration in irrigation water, duration of furrow exposure, and total PAM applied. The most effective treatments either applied PAM at 10 g m-3 in irrigation inflows during the entire furrow advance period (initial-load, I10,100%), or applied 5 g m-3 during the entire furrow advance, then reapplied PAM for 5-15 min episodically at similar concentrations (initial plus episodic, IE5,100%). Over a range of application rates of at least 0.7 kg ha-1 PAM and mean of 1.3 kg ha-1 , treatments reduced furrow sediment loss by 94% and increased net infiltration by 15%. The full-advance I10,100% and IE5,100% treatments were nearly twice as effective as the continuous 0.25 g m-3 PAM application on these soils when slopes were 1-2%. The I10,100% strategy protected furrows on slopes ranging up to 3.5%. Dry and solution applications controlled erosion about equally. The PAM applications were economical and effective methods for controlling furrow-irrigation induced erosion, under a broad range of field conditions.

Item Type: Conference or Workshop Item (Paper)
NWISRL Publication Number: 0890
Subjects: Irrigation > Furrow irrigation > Erosion > Polyacrylamide
Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Application Strategies
Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Erosion control
Soil > Erosion
Mass Import - autoclassified (may be erroneous)
Depositing User: Michelle Wayment
Date Deposited: 20 Nov 2010 21:55
Last Modified: 22 Nov 2016 23:41
Item ID: 863
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/863

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