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Cover crops and irrigation impacts on corn production and economic returns

Author

Listed:
  • Russell, Dillon
  • Singh, Gurbir
  • Quintana-Ashwell, Nicolas
  • Kaur, Gurpreet
  • Gholson, Drew
  • Krutz, L. Jason
  • Nelson, Kelly A.

Abstract

Increases in irrigated crop acreage and frequent droughts during the growing season have caused continual groundwater decline of the Mississippi River Valley Alluvial Aquifer in the Mississippi Delta region. A field experiment was conducted from 2019 to 2021 to determine if combinations of irrigation scheduling thresholds and cover crops (CCs) could improve corn (Zea mays L.) production, water productivity (WP), irrigation water use efficiency (IWUE), and net returns. The irrigation thresholds used for irrigation scheduling were a wet threshold (−40 kPa), a dry threshold (−90 kPa), and no irrigation. The CC treatments were cereal rye (Secale cereale L.), hairy vetch (Vicia villosa R.), wheat (Triticum aestivum L.)-radish (Raphanus sativus L.)-turnip (Brassica rapa L.) mix, and no cover crop. In 2020, CCs reduced corn yield by 9–26% compared to no cover crop. In 2021, wet irrigation threshold treatments had 8% and 9% higher corn yield than no irrigation and dry irrigation threshold treatments, respectively. No irrigation treatments showed higher WP than dry and wet irrigation thresholds, while hairy vetch had higher in WP among CC treatments in year two of this study. Hairy vetch under the dry irrigation threshold had higher IWUE than all other treatments. The no-CC treatments generated $167, $340, and $58 ha−1 more under the wet, dry, and no irrigation treatments, respectively, when averaged over both years. Water conservation was affected by CC selection and irrigation management.

Suggested Citation

  • Russell, Dillon & Singh, Gurbir & Quintana-Ashwell, Nicolas & Kaur, Gurpreet & Gholson, Drew & Krutz, L. Jason & Nelson, Kelly A., 2024. "Cover crops and irrigation impacts on corn production and economic returns," Agricultural Water Management, Elsevier, vol. 295(C).
    • Handle: RePEc:eee:agiwat:v:295:y:2024:i:c:s037837742400074x
    DOI: 10.1016/j.agwat.2024.108739
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    References listed on IDEAS

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