Co-application of DMPSA and NBPT with urea mitigates both nitrous oxide emissions and nitrate leaching during irrigated potato production

Emerson F.C. Souza, Carl J. Rosen, Rodney T. Venterea

Research output: Contribution to journalArticlepeer-review

Abstract

Potato (Solanum tuberosum L.) production in irrigated coarse-textured soils requires intensive nitrogen (N) fertilization which may increase reactive N losses. Biological soil additives including N-fixing microbes (NFM) have been promoted as a means to increase crop N use efficiency, though few field studies have evaluated their effects, and none have examined the combined use of NFM with microbial inhibitors. A 2-year study (2018–19) in an irrigated loamy sand quantified the effects of the urease inhibitor NBPT, the nitrification inhibitor DMPSA, NFM, and the additive combinations DMPSA + NBPT and DMPSA + NFM on potato performance and growing season nitrous oxide (N2O) emissions and nitrate (NO3) leaching. All treatments, except a zero-N control, received diammonium phosphate at 45 kg N ha−1 and split applied urea at 280 kg N ha−1. Compared with urea alone, DMPSA + NBPT reduced NO3 leaching and N2O emissions by 25% and 62%, respectively, and increased crop N uptake by 19% in one year, although none of the additive treatments increased tuber yields. The DMPSA and DMPSA + NBPT treatments had greater soil ammonium concentration, and all DMPSA-containing treatments consistently reduced N2O emissions, compared to urea-only. Use of NBPT by itself reduced NO3 leaching by 21% across growing seasons and N2O emissions by 37% in 2018 relative to urea-only. In contrast to the inhibitors, NFM by itself increased N2O by 23% in 2019; however, co-applying DMPSA with NFM reduced N2O emissions by ≥ 50% compared to urea alone. These results demonstrate that DMPSA can mitigate N2O emissions in potato production systems and that DMPSA + NBPT can reduce both N2O and NO3 losses and increase the N supply for crop uptake. This is the first study to show that combining a nitrification inhibitor with NFM can result in decreased N2O emissions in contrast to unintended increases in N2O emissions that can occur when NFM is applied by itself.

Original languageEnglish (US)
Article number117124
JournalEnvironmental Pollution
Volume284
DOIs
StatePublished - Sep 1 2021

Bibliographical note

Funding Information:
The authors gratefully acknowledge the assistance of S. Mitchell, M. Dolan, M. McNearney, R. Lozano, R. Faber, J. Crants, and J. Rasset. We would also like to thank Eurochem Agro for providing grant to support these research projects ( UMN proj. CON000000071571 and USDA /ARS proj. 58-5062-8-004-F ). Mention of commercial products and trade names in this publication is exclusively for providing particular information and does not signify recommendation or endorsement by the U.S. Department of Agriculture or the University of Minnesota. The U.S. Depart. of Agriculture is an equal opportunity provider and employer.

Funding Information:
The authors gratefully acknowledge the assistance of S. Mitchell, M. Dolan, M. McNearney, R. Lozano, R. Faber, J. Crants, and J. Rasset. We would also like to thank Eurochem Agro for providing grant to support these research projects (UMN proj. CON000000071571 and USDA/ARS proj. 58-5062-8-004-F). Mention of commercial products and trade names in this publication is exclusively for providing particular information and does not signify recommendation or endorsement by the U.S. Department of Agriculture or the University of Minnesota. The U.S. Depart. of Agriculture is an equal opportunity provider and employer.

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Azotobacter vinelandii
  • Biostimulant
  • Clostridium pasteurianum
  • Greenhouse gas emissions
  • Nitrification and urease inhibitors

PubMed: MeSH publication types

  • Journal Article

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