|Zobeck, Teddy - Ted|
Submitted to: Meeting Abstract
Publication Type: Abstract only
Publication Acceptance Date: 3/26/2003
Publication Date: 11/2/2003
Citation: Gardner, S., Zartman, R.E., Jaynes, W.F., Zobeck, T.M. 2003. Wet aggregate stability modification using ferrihydrite, layered double hydroxide, and stockopam. Meeting Abstract. Interpretive Summary:
Technical Abstract: Soil erosion is a widespread problem throughout the world. Different methods have been tested to increase aggregate stability and thereby reduce erosion losses. Our objective was to show how three additives, Ferrihydrite, a layered-double-hydroxide mineral (LDH), and Polyacrylamide (PAM), affect wet-aggregate stability. Samples of three soil series, Amarillo, Olton, and Routon, with a range in texture (fine sandy loam, clay loam, silt loam) and pH (4-7) were used. Samples (1000g) of each soil were mixed with aqueous solutions (200mL) containing 0.15g and 0.45g of Ferrihydrite, LDH, and PAM. The moist, treated soil samples were incubated at 38C for 8 hours, air-dried, and sieved to less than 2mm. Later, 1-2 mm aggregate subsamples (4g) from each sample were used in the Soil Aggregate Washing Procedure (Method 17-3.2.1). Preliminary data on percent stable aggregates in the Amarillo samples were: control, 2.2%, 0.15g Ferrihydrite, 56.2%, and 0.45g PAM, 65.3%. PAM clearly yielded the greatest increase in aggregate stability for the Amarillo soil, but LDH and Ferrihydrite also increased aggregation. Although less effective than PAM, environmentally more prersistent mineral treatments, such as LDH and Ferrihydrite, might produce longer lasting increases in aggregate stability.