Comparing first- and second-generation bioethanol by-products from sugarcane: Impact on soil carbon and nitrogen dynamics

Bera, T.; Inglett, K. S.; Inglett, P. W.; Vardanyan, L.; Wilkie, A. C.; O'Connor, G. A.; Reddy, K. R.

doi:10.1016/j.geoderma.2020.114818

Title: Comparing first- and second-generation bioethanol by-products from sugarcane: Impact on soil carbon and nitrogen dynamics

Journal Article · Thu Nov 19 00:00:00 EST 2020 · Geoderma

DOI:https://doi.org/10.1016/j.geoderma.2020.114818· OSTI ID:1850614

Bera, T. ^[1]; Inglett, K. S. ^[1]; Inglett, P. W. ^[1];

^[1]; Wilkie, A. C. ^[1]; O'Connor, G. A. ^[1]; Reddy, K. R. ^[1]

Univ. of Florida, Gainesville, FL (United States). Soil and Water Sciences Dept.

The first- and second-generation bioethanol by-products (bagasse and fermentation by-product, respectively) have different biochemical characteristics relating to carbon (C) and nitrogen (N) due to their production processes. To examine the impacts of fermentation by-product and bagasse on soil C and N dynamics, a 120 day laboratory incubation experiment was conducted by applying these amendments in soil at an equal carbon application rate (2.2 g C kg^-1 soil). There was a significant increase in overall cumulative CO₂-C production from amended soil compared to the control soil, though the loss was greatest in bagasse amended soil. However, δ13C-CO₂ measurements suggested that fermentation by-product addition suppressed native soil C mineralization and prompted strong negative C priming (-57%). In contrast, bagasse amendment maintained similar native soil C mineralization to control soil. Decreased microbial biomass turnover time appears to be the major driving force for increased CO₂-C production and soil C loss following bioethanol by-product amendments. Increased mineral N production indicated net N mineralization after fermentation by-product addition, while addition of bagasse resulted in lower N availability and N immobilization. Overall, results suggested that fermentation by-product application is advantageous in maintaining native soil C stock and N mineralization compared to bagasse. Thus, in a sustainable second-generation bioethanol production system, bagasse may be used for second-generation bioethanol production and the cogenerated by-product could be used as an amendment to improve soil C stock and N availability.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE Office of Policy and International Affairs (PO); USDOE

Grant/Contract Number:: PI0000031

OSTI ID:: 1850614

Alternate ID(s):: OSTI ID: 1775808

Journal Information:: Geoderma, Vol. 384, Issue C; ISSN 0016-7061

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Comparing first- and second-generation bioethanol by-products from sugarcane: Impact on soil carbon and nitrogen dynamics

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