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

Author

Listed:
  • Kai Yang

    (College of Water Sciences, Beijing Normal University, Beijing 100875, China)

  • Zejun Tang

    (College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China)

  • Jianzhang Feng

    (College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China)

Abstract

Sandy soils are prone to nutrient losses, and consequently do not have as much as agricultural productivity as other soils. In this study, coal fly ash (CFA) and anionic polyacrylamide (PAM) granules were used as a sandy soil amendment. The two additives were incorporated to the sandy soil layer (depth of 0.2 m, slope gradient of 10°) at three CFA dosages and two PAM dosages. Urea was applied uniformly onto the low-nitrogen (N) soil surface prior to the simulated rainfall experiment (rainfall intensity of 1.5 mm/min). The results showed that compared with no addition of CFA and PAM, the addition of CFA and/or PAM caused some increases in the cumulative NO 3 − -N and NH 4 + -N losses with surface runoff; when the rainfall event ended, 15% CFA alone treatment and 0.01–0.02% PAM alone treatment resulted in small but significant increases in the cumulative runoff-associated NO 3 − -N concentration ( p < 0.05), meanwhile 10% CFA + 0.01% PAM treatment and 15% CFA alone treatment resulted in nonsignificant small increases in the cumulative runoff-associated NH 4 + -N concentration ( p > 0.05). After the rainfall event, both CFA and PAM alone treatments increased the concentrations of NO 3 − -N and NH 4 + -N retained in the sandy soil layer compared with the unamended soil. As the CFA and PAM co-application rates increased, the additive effect of CFA and PAM on improving the nutrient retention of sandy soil increased.

Suggested Citation

  • Kai Yang & Zejun Tang & Jianzhang Feng, 2021. "Coal Fly Ash and Polyacrylamide Influence Transport and Redistribution of Soil Nitrogen in a Sandy Sloping Land," Agriculture, MDPI, vol. 11(1), pages 1-15, January.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:1:p:47-:d:477780
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    References listed on IDEAS

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    1. Zhang, Wangshou & Li, Hengpeng & Pueppke, Steven G & Diao, Yaqin & Nie, Xiaofei & Geng, Jianwei & Chen, Dongqiang & Pang, Jiaping, 2020. "Nutrient loss is sensitive to land cover changes and slope gradients of agricultural hillsides: Evidence from four contrasting pond systems in a hilly catchment," Agricultural Water Management, Elsevier, vol. 237(C).
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