Straw uses trade-off only after soil organic carbon steady-state

  • Agata Novara Dipartimento di Scienze Agrarie, Alimentari e Forestali, University of Palermo, Palermo, Italy.
  • Mauro Sarno Dipartimento di Scienze Agrarie, Alimentari e Forestali, University of Palermo, Palermo, Italy.
  • Paulo Pereira Environmental Management Centre, MykolasRomeris University, Vilnius, Lithuania.
  • Artemi Cerdà Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Valencia, Spain.
  • Eric C. Brevik Department of Natural Sciences, Dickinson State University, Dickinson, ND, United States.
  • Luciano Gristina | luciano.gristina@unipa.it Dipartimento di Scienze Agrarie, Alimentari e Forestali, University of Palermo, Palermo, Italy.

Abstract

Soil organic matter (SOM) is the key for a healthy soil and a relevant property to achieve the sustainability on soil management. However, soils are still net exporters of organic matter. One example is the use of wheat straw residue for industrial and energy applications, which has gained attention in the last years. The offfarm use of this abundant and low cost resource should follow sustainability criteria to avoid soil degradation and SOM losses. Straw residue incorporation is recognized as a recommended management practice to control erosion and mitigate CO2 emissions by increasing SOM. The goal of this work was: i) to evaluate the steady-state carbon (C) level in relation to C input and estimate the minimum residue input needed to maintain this SOC level in a durum wheat-based cropping system in long-term experiment; and ii) estimate the potential availability of durum wheat straws for alternative use. Results showed that a C steady-state can be achieved after 3.4 years with an annual organic C input of 4.5 Mgha–1. Only after reaching a steady-state, straws can be used for trade-off, leaving 1.03 Mgha–1y–1 of C input remain in the soil.

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Published
2018-07-23
Section
Original Articles
Keywords:
Carbon input maintain, Mediterranean durum wheat-based system, soil carbon sequestration, regional straw assessement.
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How to Cite
Novara, A., Sarno, M., Pereira, P., Cerdà, A., Brevik, E., & Gristina, L. (2018). Straw uses trade-off only after soil organic carbon steady-state. Italian Journal of Agronomy, 13(3), 216-220. https://doi.org/10.4081/ija.2018.1101