us9357769b2 – polyacrylamide based agricultural compositions

us9357769b2 – polyacrylamide based agricultural compositions
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  • Can polyacrylamide soil amendments be used on a farm?
  • Polyacrylamide (PAM) soil amendments are increasingly used to remediate these degraded lands with the potential benefits on soil health and crop production. However, the scientific evidence of farm-scale use of one-time versus repeated application of PAM has not been reported.
  • What is a polyacrylamide (PAM)?
  • Polyacrylamides (PAMs) are relatively inexpensive polymers that are easily formulated to high molecular weights on the order of several million g/mol. PAM was first used in the paper industry in the mid-1950s.
  • Is polyacrylic acid a product of Pam degradation?
  • Hayashi et al. (1994) suggested that the simple compound polyacrylic acid might be another product of PAM degradation under some conditions, which can also be metabolized by microorganisms.
  • Does polyacrylamide undergo photodegradation?
  • Polyacrylamide undergoes thermal degradation at 175 to 300°C (Smith et al., 1996) and can also undergo photodegradation. Acrylamide is readily biodegraded under aerobic conditions by microorganisms in soil and water by deamination to acrylic acid and ammonia, which are utilized as carbon and nitrogen sources.