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Cover crop termination method has a limited effect on spring soil moisture and temperature in humid mid-Atlantic U.S

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  • Peterson, Cara M.
  • Schomberg, Harry H.
  • Thompson, Alondra I.
  • Mirsky, Steven B.
  • Tully, Kate L.

Abstract

Winter cover crop termination is commonly achieved by applying broad-spectrum herbicides, which vary in mode of action and time required to kill the cover crop. Many growers also use roller-crimpers to mechanically kill cover crops or to create a uniform horizontal mulch for planting cash crops. The influence of mechanical termination methods on soil moisture and temperature has been previously evaluated, but not paired with chemical termination as frequently is the case in farming operations. To address this question, soil moisture and temperature were measured continuously in central Maryland, USA, across five weeks under a cereal rye (Secale cereale L.) cover crop terminated via roller-crimper and the application of glyphosate and paraquat. Over two years, there were minimal to no differences in cumulative infiltration or evapotranspiration among termination treatments at two fields with contrasting soil textures. In all four site-years, daily temperature fluctuation was higher in roller-crimped residue (17.3 °C) compared to standing (15.0 °C). In this study, we delayed cover crop termination until anthesis to facilitate successful roller-crimping, resulting in a thick cover crop mulch layer after termination and reduced soil moisture loss via evaporation. In humid regions such as the mid-Atlantic United States, growers may not observe differences in soil moisture or temperature between mechanical or chemical termination methods. However, soil moisture and thermal dynamics might shift depending on termination strategy in arid regions or years with lower-than-average precipitation.

Suggested Citation

  • Peterson, Cara M. & Schomberg, Harry H. & Thompson, Alondra I. & Mirsky, Steven B. & Tully, Kate L., 2025. "Cover crop termination method has a limited effect on spring soil moisture and temperature in humid mid-Atlantic U.S," Agricultural Water Management, Elsevier, vol. 311(C).
    • Handle: RePEc:eee:agiwat:v:311:y:2025:i:c:s0378377425000563
    DOI: 10.1016/j.agwat.2025.109342
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    References listed on IDEAS

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    1. Schomberg, Harry H. & White, Kathryn E. & Thompson, Alondra I. & Bagley, Gwendolyn A. & Burke, Allen & Garst, Grace & Bybee-Finley, K. Ann & Mirsky, Steven B., 2023. "Interseeded cover crop mixtures influence soil water storage during the corn phase of corn-soybean-wheat no-till cropping systems," Agricultural Water Management, Elsevier, vol. 278(C).
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