Net Infiltration and Soil Erosion Effects of a Few PPM Polyacrylamide in Furrow Irrigation Water
Sojka, R.E. and Lentz, R.D. (1995) Net Infiltration and Soil Erosion Effects of a Few PPM Polyacrylamide in Furrow Irrigation Water. pp. 349-354. In: So, H.B. and Smith, G.D. and Raine, S.R. and Schafer, B.M. and Loch, R.J. (eds.) Proc. 2nd Intl. Symposium on Sealing, Crusting and Hardsetting Soils: Productivity and Conservation. Australia-Brisbane (University of Queensland), 1994/02/07-11. Australian Society of Soil Science Inc. (Queensland Branch).
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Abstract
Furrow irrigation-induced erosion, seal formation, and reduced net infiltration are
severe problems in the United States of America (USA) Pacific Northwest. High
molecular weight (10^7 g mol-1), anionic (18% charge density) polyacrylamide
(PAM) is a potent flocculent. Economical PAM application strategies can reduce
seal formation, runoff and erosion in furrow irrigation. Three years of studies
verified this for 3 soils. Field slopes were 0.5-7.0%. Furrow lengths were 150-
250 m and inflow rates were 12.8-37.8 L min-1 . PAM reduced erosion by 43 to
99% for various application strategies using as little as 5 ppm PAM in furrow
advance water with renewal of 5 ppm PAM for 5 minutes of each subsequent hour
of irrigation. PAM stabilized net infiltration at higher rates by reducing seal
formation. PAM increased the lateral wetting extent by 25% and net infiltration
by 15% compared to controls. PAM efficacy varied with concentration, duration
of furrow exposure, and flow rate. Furrow-bottom crusts of similar soil strength
formed in PAM-treated and control furrows, but their associated seals produced
different net infiltration.
Item Type: | Conference or Workshop Item (Paper) |
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NWISRL Publication Number: | 0873 |
Subjects: | Irrigation > Furrow irrigation > Erosion > Polyacrylamide Irrigation > Furrow irrigation > Infiltration > Polyacrylamide Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Erosion control Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Infiltration management Soil > Erosion Mass Import - autoclassified (may be erroneous) |
Depositing User: | Users 6 not found. |
Date Deposited: | 20 Nov 2010 21:57 |
Last Modified: | 23 Nov 2016 18:36 |
Item ID: | 1072 |
URI: | https://eprints.nwisrl.ars.usda.gov/id/eprint/1072 |