Coal Fly Ash and Polyacrylamide Influence Transport and Redistribution of Soil Nitrogen in a Sandy Sloping Land

Sandy soils are prone to nutrient losses, and consequently do not have as much agricultural productivity other soils. In this study, coal fly ash (CFA) anionic polyacrylamide (PAM) granules were used a sandy soil amendment. The two additives incorporated the layer (depth of 0.2 m, slope gradient 10°) at three CFA dosages PAM dosages. Urea was applied uniformly onto low-nitrogen (N) surface prior simulated rainfall experiment (rainfall intensity 1.5 mm/min). results showed that compared with no addition PAM, and/or caused some increases in cumulative NO3−-N NH4+-N losses runoff; when event ended, 15% alone treatment 0.01–0.02% resulted small but significant runoff-associated concentration (p < 0.05), meanwhile 10% + 0.01% nonsignificant > 0.05). After event, both treatments increased concentrations retained unamended soil. As co-application rates increased, additive effect on improving retention increased.