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Effect of micro-irrigation type, N-source and mulching on nitrous oxide emissions in a semi-arid climate: An assessment across two years in a Merlot grape vineyard

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  • Fentabil, Mesfin M.
  • Nichol, Craig F.
  • Neilsen, Gerry H.
  • Hannam, Kirsten D.
  • Neilsen, Denise
  • Forge, Tom A.
  • Jones, Melanie D.

Abstract

Micro-irrigation, fertigation, and mulching have been proposed to improve the nutrient and water-use efficiency of crop production. The effect of these management practices on the emission of nitrous oxide (N2O) from vineyards is not well understood and most prior studies were short-term (<1 year). To investigate longer-term effects, a study was conducted in grape (Vitus vinifera L. cv. Merlot planted in a sandy loam soil in British Columbia, Canada. The experiment was a factorial treatment design consisting of two micro-irrigation types (Drip or Micro-sprinkler), two nitrogen sources (surface applied Compost or fertigated Urea at a rate of 40kgNha−1), and two vineyard floor managements (bark Mulch or “Clean”—meaning bare soil). Frequent measurements of N2O flux and soil and environmental variables were made over two complete years (2013 and 2014). A considerable portion (37% in 2013 and 61% in 2014) of the annual cumulative N2O emission (ΣN2O) occurred during the pre-growing season particularly within the thaw period. In 2013, the annual area-scaled ΣN2O emissions for Drip was ≈1.8×Micro-sprinkler, Urea was ≈1.5×Compost and Clean was ≈1.7×Mulch. In 2014, ΣN2O emissions were over 14% higher, likely due to more freeze–thaw events, higher soil mineral N availability (47% higher), but treatments differences were not significantly different. Analysed over two years, micro-sprinkler reduced growing season emissions by 29% and surface application of bark mulch decreased annual area-scaled and yield-scaled ΣN2O emissions by 28% and 23%, respectively, suggesting bark mulch as a strategy for mitigating N2O emission. The observed interannual variability in the total N2O emissions suggests that at least a minimum of 2 years of continuous study may be required to estimate representative annual N2O emission budgets and to recommend N2O mitigation strategies in vineyard systems.

Suggested Citation

  • Fentabil, Mesfin M. & Nichol, Craig F. & Neilsen, Gerry H. & Hannam, Kirsten D. & Neilsen, Denise & Forge, Tom A. & Jones, Melanie D., 2016. "Effect of micro-irrigation type, N-source and mulching on nitrous oxide emissions in a semi-arid climate: An assessment across two years in a Merlot grape vineyard," Agricultural Water Management, Elsevier, vol. 171(C), pages 49-62.
    • Handle: RePEc:eee:agiwat:v:171:y:2016:i:c:p:49-62
    DOI: 10.1016/j.agwat.2016.02.021
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    References listed on IDEAS

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    1. Hanson, Blaine R. & Simunek, Jirka & Hopmans, Jan W., 2006. "Evaluation of urea-ammonium-nitrate fertigation with drip irrigation using numerical modeling," Agricultural Water Management, Elsevier, vol. 86(1-2), pages 102-113, November.
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    1. Zhang, Binbin & Yan, Sihui & Li, Bin & Wu, Shufang & Feng, Hao & Gao, Xiaodong & Song, Xiaolin & Siddique, Kadambot H.M., 2023. "Combining organic and chemical fertilizer plus water-saving system reduces environmental impacts and improves apple yield in rainfed apple orchards," Agricultural Water Management, Elsevier, vol. 288(C).
    2. Guo, Yanjie & Ji, Yanzhi & Zhang, Jie & Liu, Qiao & Han, Jian & Zhang, Lijuan, 2022. "Effects of water and nitrogen management on N2O emissions and NH3 volatilization from a vineyard in North China," Agricultural Water Management, Elsevier, vol. 266(C).

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