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Polyacrylamide coated Milorganite™ and gypsum for controlling sediment and phosphorus loads

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  • Mailapalli, Damodhara R.
  • Thompson, Anita M.

Abstract

The application of polymer for controlling erosion and the associated nutrient transport has been well documented. However, comparatively less information is available on the effect of polymer application together with soil amendments. In this study, the effect of polyacrylamide (PAM) in combination with surface application of gypsum and Milorganite™ (MILwaukee ORGAnic NITtrogEn) biosolid for reducing sediment and phosphorus transport under laboratory rainfall simulations was investigated. The treatments considered were bare soil, gypsum, Milorganite™, gypsum+Milorganite™, PAM-coated gypsum and PAM-coated Milorganite™. Application rates for gypsum and Milorganite™ were 392kgha−1 (350lb/acre) and 726kgha−1 (650lb/acre), respectively. The PAM was coated on gypsum and Milorganite™ at an application rate of 11.2kgha−1 (10lb/acre) and 22.4kgha−1 (20lb/acre), respectively. Rain simulation experiments were conducted using a rainfall intensity of 6.0cmh−1 for 1h on a 10% slope. Surface runoff was collected continuously from each soil box over 10min intervals and leachate was collected continuously over the 60min simulation. The reduction in runoff or in leachate for all treatments was not significantly different from the bare soil control. The sediment loss for PAM coated Milorganite™ was reduced by 77%, when compared to bare soil. However, the sediment loss was not significantly reduced for any other treatment compared to bare soil. The PAM-coated gypsum was not effective for erosion control in our study, and there appears to be a correlation between effectiveness and prill size. However, the gypsum (coated and uncoated) contributed about half of the dissolved reactive phosphorus (DRP) export (in the runoff) compared to bare soil. The PAM-coated Milorgante™ reduced the DRP and total phosphorus (TP) export to 0.3–0.5 times that of Milorganite™ and to levels similar to bare soil. The decreased sediment and phosphorus export for the PAM-coated Milorganite™ treatment is a signal for a potential management practice for controlling erosion and nutrient transport in fertilized agricultural landscapes.

Suggested Citation

  • Mailapalli, Damodhara R. & Thompson, Anita M., 2011. "Polyacrylamide coated Milorganite™ and gypsum for controlling sediment and phosphorus loads," Agricultural Water Management, Elsevier, vol. 101(1), pages 27-34.
    • Handle: RePEc:eee:agiwat:v:101:y:2011:i:1:p:27-34
    DOI: 10.1016/j.agwat.2011.08.021
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    References listed on IDEAS

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    1. David Pimentel, 2006. "Soil Erosion: A Food and Environmental Threat," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 8(1), pages 119-137, February.
    2. Mailapalli, Damodhara R. & Wallender, Wesley W. & Burger, Martin & Horwath, William R., 2010. "Effects of field length and management practices on dissolved organic carbon export in furrow irrigation," Agricultural Water Management, Elsevier, vol. 98(1), pages 29-37, December.
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    1. Ripendra Awal & Almoutaz El Hassan & Farhat Abbas & Ali Fares & Haimanote K. Bayabil & Ram L. Ray & Selamawit Woldesenbet, 2021. "Patterns of Nutrient Dynamics within and below the Rootzone of Collard Greens Grown under Different Organic Amendment Types and Rates," Sustainability, MDPI, vol. 13(12), pages 1-16, June.

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