Varying Influence of Dairy Manure Injection on Phosphorus Loss in Runoff over Four Years

  • Jahanzad E
  • Saporito L
  • Karsten H
  • et al.
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Abstract

Surface application of manure on no-till farms can exacerbate P losses in runoff, contributing to the eutrophication of surface waters. We monitored 12 400-m2 field plots over 4 yr to compare P losses in surface runoff and lateral subsurface flow with shallow disk injection and broadcast application of dairy manure. Given the substantial variability in annual P losses, as well as a gradual, annual buildup of residual soil test P, significant differences in runoff P losses were detected in only 1 of 4 yr: in 2014, total P losses in runoff were 68% greater from broadcast manure plots than injected manure plots. Dissolved and particulate P were roughly even in their contribution to runoff. Even so, there were significant relationships between annual dissolved P losses and P in the soil surface, which pointed to soils as a regular source of P in runoff. Overall, results confirm the potential for injection to reduce P loss in runoff relative to broadcast application, but because in a few sampling dates injection resulted in greater losses, this study also highlights the importance of assessing mitigation benefits of manure application practices over longer timeframes.

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APA

Jahanzad, E., Saporito, L. S., Karsten, H. D., & Kleinman, P. J. A. (2019). Varying Influence of Dairy Manure Injection on Phosphorus Loss in Runoff over Four Years. Journal of Environmental Quality, 48(2), 450–458. https://doi.org/10.2134/jeq2018.05.0206

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