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Abiotic and Biotic Limitations to Nodulation by Leguminous Cover Crops in South Texas

Author

Listed:
  • Stephanie Kasper

    (School of Earth, Environmental and Marine Sciences, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA)

  • Bradley Christoffersen

    (Department of Biology, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA)

  • Pushpa Soti

    (Department of Biology, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA)

  • Alexis Racelis

    (School of Earth, Environmental and Marine Sciences, University of Texas Rio Grande Valley, Edinburg, TX 78539, USA)

Abstract

Many farms use leguminous cover crops as a nutrient management strategy to reduce their need for nitrogen fertilizer. When they are effective, leguminous cover crops are a valuable tool for sustainable nutrient management. However, the symbiotic partnership between legumes and nitrogen fixing rhizobia is vulnerable to several abiotic and biotic stressors that reduce nitrogen fixation efficiency in real world contexts. Sometimes, despite inoculation with rhizobial strains, this symbiosis fails to form. Such failure was observed in a 14-acre winter cover crop trial in the Rio Grande Valley (RGV) of Texas when three legume species produced no signs of nodulation or nitrogen fixation. This study examined the role of nitrogen, phosphorus, moisture, micronutrients, and native microbial communities in the nodulation of cowpea ( Vigna unguiculata L. Walp) and assessed arbuscular mycorrhizal fungi as an intervention to improve nodulation. Results from two controlled studies confirm moisture and native microbial communities as major factors in nodulation success. Micronutrients showed mixed impacts on nodulation depending on plant stress conditions. Nitrogen and phosphorus deficiencies, however, were not likely causes, nor was mycorrhizal inoculation an effective intervention to improve nodulation. Inoculation method also had a major impact on nodulation rates. Continued research on improved inoculation practices and other ways to maximize nitrogen fixation efficiency will be required to increase successful on-farm implementation.

Suggested Citation

  • Stephanie Kasper & Bradley Christoffersen & Pushpa Soti & Alexis Racelis, 2019. "Abiotic and Biotic Limitations to Nodulation by Leguminous Cover Crops in South Texas," Agriculture, MDPI, vol. 9(10), pages 1-20, September.
    • Handle: RePEc:gam:jagris:v:9:y:2019:i:10:p:209-:d:269739
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    References listed on IDEAS

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    1. L. E. Drinkwater & P. Wagoner & M. Sarrantonio, 1998. "Legume-based cropping systems have reduced carbon and nitrogen losses," Nature, Nature, vol. 396(6708), pages 262-265, November.
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