Abstract
Reversing land management from no-tillage to conventional tillage (tillage reversal, TR) may markedly alter soil greenhouse gas (GHG) emissions in soils with differing fertility levels. We studied the impact of TR and nitrogen (N) fertilization on CO2 (total CO2 flux and its components), N2O and CH4 fluxes, and area- and yield-scaled GHG fluxes over two growing seasons in central Alberta, Canada. A split-plot design was used with two levels of N, 0 (N0) vs. 100 kg N ha− 1 yr− 1 (N100), and tillage, long-term no-tillage (NT) vs. TR, treatments. The TR treatment increased total CO2 fluxes (Rt), mainly attributed to the increased CO2 production from microbial activity (Rh), with the Rh/Rt ratio ranging between 52 and 61% in this study. The area-scaled GHG fluxes ranged from 3.10 to 4.50 Mg CO2-C eq. ha− 1, while the yield-scaled GHG fluxes ranged from 1.36 to 5.84 kg CO2-C eq. kg− 1 grain. The area-scaled GHG fluxes were 0.74 Mg CO2-C eq. ha− 1 higher in the TR than in the NT treatment, and 14.7% higher in the N100 than in the N0 treatment. Nitrogen fertilization did not affect the yield-scaled GHG fluxes; however, the TR treatment lowered the yield-scaled GHG fluxes due to the significantly increased crop yield. Therefore, management decisions will have to consider whether the objective is to reduce total GHG emissions on an area basis or to minimize GHG emissions per unit crop yield. Our study shows that periodic tillage of long-term NT soils increased yield and reduced yield-scaled GHG emissions, suggesting that tillage reversal is practical if the management objective is to maximize yield and minimize GHG emissions per unit crop yield.
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Acknowledgements
We wish to thank the Natural Sciences and Engineering Research Council of Canada (NSERC), the National Key Research and Development Program of China (2021YFD1500801), and the National Natural Science Foundation of China (Grant No. 32071840) for supporting equipment and funding this research. We thank S.J. Ren, K.H. Jung and many others for helping with soil and gas sample collections.
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Sun, L., Feng, Y.S., Dyck, M.F. et al. Tillage reversal of long-term no-till soil increases crop yield while mitigating yield-scaled growing season GHG fluxes in a black Chernozem cropped to barley (Hordeum vulgare L.). Biol Fertil Soils (2023). https://doi.org/10.1007/s00374-023-01789-3
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DOI: https://doi.org/10.1007/s00374-023-01789-3