Design and calibration of percolation samplers for measuring polyacrylamide-amended furrow-irrigation effects on drainage water quality

Lentz, Rodrick D. and Sojka, Robert E. and Kincaid, Dennis C. (1998) Design and calibration of percolation samplers for measuring polyacrylamide-amended furrow-irrigation effects on drainage water quality. pp. 267-276. In: Proc. of the Seventh International Drainage Symposium. Drainage in the 21st Century: Food Production and the Environment. USA-FL-Orlando, 1998/03/08-10. ASAE, St. Joseph, MI.

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Abstract

Amending irrigation furrow inflows with polyacrylamide (PAM) at low
concentrations (10 mg L -1 ) reduces irrigation-induced erosion by 94% and increases
infiltration by 15%, relative to untreated furrows. We hypothesized that PAM erosion-control
technology would allow irrigation managers to increase furrow inflows to speed
furrow-stream advance, produce a more uniform water distribution down field, and
reduce the leaching hazard at the upper end (due to reduced infiltration opportunity time
and/or shorter sets). We developed, tested, and installed instruments in a furrow
irrigated Portneuf silt loam (Co-Si, mixed, mesic, Durixerollic Calciorthids with 1.6%
slope) to investigate this premise. Soils were instrumented with repeating pulse
multivibrator (CS-615) soil water sensors, thermocouples, tensiometers, and percolation
soil water samplers at upper and lower ends of the furrows. Percolation samplers
consisted of a 23-cm-deep, 20-cm-dia. stainless-steel beaker with a 1 7-cm-long, 4-cm-dia.,
0.5 bar air-entry ceramic cup imbedded in a 5-cm-deep silica flour layer, slurried into
the beaker bottom. Water was collected under suction (~ 1.4x ambient) via teflon tubes.
Percolation sampler design and testing, field installation, and study experimental design
are discussed.

Item Type:	Conference or Workshop Item (Paper)
NWISRL Publication Number:	0959
Subjects:	Irrigation > Furrow irrigation > Drainage water (see Percolation water) Irrigation > Furrow irrigation > Erosion > Polyacrylamide Irrigation > Furrow irrigation > Percolation water Percolation > Percolation sampler Percolation > Polyacrylamide Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Drainage water (see Percolation water) Polyacrylamide (PAM) > Water-soluble PAM (WSPAM) > Percolation water Water > Water quality > Polyacrylamide Research methodology Mass Import - autoclassified (may be erroneous)
Depositing User:	Users 6 not found.
Date Deposited:	20 Nov 2010 21:55
Last Modified:	21 Nov 2016 19:36
Item ID:	860
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/860