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No-Tillage Does Not Always Stop the Soil Degradation in Relation to Aggregation and Soil Carbon Storage in Mediterranean Olive Orchards

Author

Listed:
  • Manuel González-Rosado

    (SUMAS Research Group, Department of Agricultural Chemistry, Soil Science and Microbiology, Faculty of Science, Agri-Food Campus of International Excellence—ceiA3, University of Cordoba, 14071 Cordoba, Spain)

  • Luis Parras-Alcántara

    (SUMAS Research Group, Department of Agricultural Chemistry, Soil Science and Microbiology, Faculty of Science, Agri-Food Campus of International Excellence—ceiA3, University of Cordoba, 14071 Cordoba, Spain)

  • Jesús Aguilera-Huertas

    (SUMAS Research Group, Department of Agricultural Chemistry, Soil Science and Microbiology, Faculty of Science, Agri-Food Campus of International Excellence—ceiA3, University of Cordoba, 14071 Cordoba, Spain)

  • Beatriz Lozano-García

    (SUMAS Research Group, Department of Agricultural Chemistry, Soil Science and Microbiology, Faculty of Science, Agri-Food Campus of International Excellence—ceiA3, University of Cordoba, 14071 Cordoba, Spain)

Abstract

Intensive tillage (CT) application in Mediterranean olive orchards has threatened soil quality and led to soil degradation. No tillage with bare soil (NT+H) has been considered as an alternative practice to this management system; however, there are discrepancies in the literature on the results of the application of this practice. Our main objective was to assess the impact of continuous tillage and zero tillage on soil aggregate stability, SOC and SON stocks. The study was conducted in a Mediterranean rainfed olive grove under semi-arid conditions in a Calcaric Cambisol, for 16 years evaluating complete soil profiles (0–120 cm depth). In the long-term, the management practices CT1 and NT+H significantly affected aggregate particle size by reducing the percentage of macro-aggregates (>250 μm) and promoting a higher number of micro-aggregates (<250 μm). Nevertheless, NT+H affected the Bw and BC horizons with the increase in the large macroaggregates (>2000 μm) percentage. In relation to these results, the soil structural stability indices showed a significant decrease in both Mean Weight Diameter (MWD) and Geometric Mean Diameter (GMD) values with losses of more than 50% with respect to the initial period (CT0) in the first two horizons. In the long term, both in CT1 and in NT+H, higher SOC concentrations were found in deep horizons showing a C redistribution in depth and important losses in TN values—while, in CT0, macroaggregates contained the highest CPC values, after the long-term both management practices (CT1 and NT+H) affected the C dynamics and were characterised by higher C pool in the microaggregates than in the macroaggregate fractions. Therefore, long-term NT+H and CT1 showed an SOC storage deterioration and increased susceptibility to decomposition, CO 2 emissions and fertility losses. This trend i.e., decreases in SOC stocks following NT, confirms previous studies on the subject and points to nutrient balance impacts.

Suggested Citation

  • Manuel González-Rosado & Luis Parras-Alcántara & Jesús Aguilera-Huertas & Beatriz Lozano-García, 2022. "No-Tillage Does Not Always Stop the Soil Degradation in Relation to Aggregation and Soil Carbon Storage in Mediterranean Olive Orchards," Agriculture, MDPI, vol. 12(3), pages 1-15, March.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:3:p:407-:d:771081
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    References listed on IDEAS

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    1. David Pimentel & Michael Burgess, 2013. "Soil Erosion Threatens Food Production," Agriculture, MDPI, vol. 3(3), pages 1-21, August.
    2. Cosmas Parwada & Johan Tol, 2019. "Effects of litter quality on macroaggregates reformation and soil stability in different soil horizons," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 21(3), pages 1321-1339, June.
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    Cited by:

    1. Zhijie Li & Hongguang Liu & Haichang Yang & Tangang Wang, 2023. "Effects of Deep Vertical Rotary Tillage Management Methods on Soil Quality in Saline Cotton Fields in Southern Xinjiang," Agriculture, MDPI, vol. 13(10), pages 1-13, September.
    2. Jesús Aguilera-Huertas & Luis Parras-Alcántara & Manuel González-Rosado & Beatriz Lozano-García, 2022. "What Influence Does Conventional Tillage Have on the Ability of Soils to Sequester Carbon, Stabilise It and Become Saturated in the Medium Term? A Case Study in a Traditional Rainfed Olive Grove," Sustainability, MDPI, vol. 14(12), pages 1-18, June.

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