Does water soluble Pam reduce water infiltration?

Lentz (2003) conducted a systematic soil column and miniflume study that quantified the infiltration‐inhibiting effect of water‐soluble PAM treatments for different soils under ponded and flow conditions. Surface applications of 250‐ to 1000‐ppm PAM solutions to silt loam and clay loam soil reduced water infiltration 50–90%.

Does polyacrylamide reduce sediment in irrigation?

PAM, used following NRCS guidelines (Interim conservation practice standard—irrigation erosion control (polyacrylamide), 1995, Anionic polyacrylamide (PAM) erosion control (Acre)‐code 450 USDA‐NRCS, NHCP, 2001), reduced sediment in runoff 94% in 3 years of furrow irrigation studies in Idaho (Lentz and Sojka, 1994).

What is ionic polyacrylamide (PAM)?

Anionic polyacrylamide (PAM) has been sold since 1995 to reduce irrigation‐induced erosion and enhance infiltration.

How does Pam affect water permeability?

The PAM may decrease infiltration simply by increasing sediment deposition in conducting pores, or PAM's ability to attract suspended fines from flowing water may contribute to establishment of a thin sediment layer of low permeability along the channel bottom that is held in place by the PAM.

How does Pam reduce soil infiltration?

The choice of these limits is supported by recent research (Lentz, 2003). PAM maintains higher infiltration rates in treated soils primarily by stabilizing soil structure, preventing the breakdown of soil aggregates, and reducing dispersion of waterborne soil particles, leading to formation of infiltration‐inhibiting surface seals.

Can gypsum improve Pam infiltration over control water?

Lentz and Sojka (1996b) noted that when irrigation water SAR was increased from 0.7 to 9.0 [m mol c liter −1] 0.5 that PAM's infiltration enhancement over control water was greatly diminished. Water low in electrolytes or with high SAR can be amended relatively easily through addition of gypsum (CaSo 4) or Ca (NO 3) 2 fertilizer.