Effect of Liquid and Dry PAM Applications on Sediment Concentration in Surface Runoff from Furrow-irrigated Fields

摘要

The effect of both liquid (oil-based (37% PAM) and water-based (25% PAM) formulations) and dry PAM (granules and tablets) on sediment concentration of surface runoff during furrow irrigation was investigated on loam and clay loam soils. Liquid PAM washighly effective in reducing the sediment load. Granules/tablets placed 45 m or 90 m from the head of the furrow were also effective, but, dry material placed at the head of the furrow were covered up with sediment and had no effect on sediment concentration. Sediment concentrations at the start of surface runoff were higher for the granules/tablets compared to the liquid PAM applications, but similar sediment concentrations occurred several hours after the start of runoff. PAM had no effect of infiltration.