Preprints
https://doi.org/10.5194/egusphere-2022-1524
https://doi.org/10.5194/egusphere-2022-1524
 
12 Jan 2023
12 Jan 2023
Status: this preprint is open for discussion.

Agricultural use of compost under different irrigation strategies in a hedgerow olive grove under Mediterranean conditions. A comparison with traditional systems

Laura L. de Sosa1, María José Martín-Palomo2,3, Pedro Castro-Valdecantos2,3, and Engracia Madejón1 Laura L. de Sosa et al.
  • 1Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS-CSIC) Av. Reina Mercedes 10 41012 Sevilla
  • 2Dpto. Ciencias Agroforestales, ETSIA, Universidad de Sevilla, Crta de Utrera Km 1, E-41013 Sevilla, Spain
  • 3Unidad Asociada al CSIC de Uso Sostenible del Suelo y el Agua en la Agricultura (US-IRNAS), Crta de Utrera Km 1, E-41013, Sevilla, Spain

Abstract. Soil and water efficient management are key factors to ensure olive sustainable production. The use of compost based on olive waste (alperujo) as fertilizer could enhance ecosystem services while the need to transition to a zero waste circular economy is achieved. The present work includes a comparative study of the effect of alperujo compost (AC) vs inorganic fertilization under different management systems: an intensive traditional adult olive grove under rainfed conditions and a young hedgerow olive system, in which a factorial test of tree irrigation regimes (full, deficit and no irrigation) is implemented as well. At the hedgerow plots, the addition of AC and soil sampling time greatly impacted soil chemical parameters and to a lesser extent, enzymatic activities whereas irrigation regimes did not exert a mark influence. In the traditional rainfed system, the addition of AC proved to be an efficient tool for carbon sequestration. The first soil sampling revealed a clear stoichiometric relationship between soil organic matter (SOM) and the NPK contents at both systems whereas the correlations were weak and scarce in the second sampling at the hedgerow plots. This fact was related to a decay of the compost effect. Compost in combination with irrigation tended to trigger a certain priming effect on the native SOM with time since the carbon stocks were reduced between 6–38 % from one sampling to the other in the hedgerow system depending on the irrigation intensity. However, the deficit irrigation caused a less intense reduction of the SOM and essential nutrients representing the best alternative to maximize the agronomics effects of the compost under a water-saving strategy. Recurrent application of compost would be necessary to maintain soil quality, especially with high tree densities. The combined management of AC and the deficit irrigation proved to be an efficient tool toward a zero waste circular economy and a water conservation strategy.

Laura L. de Sosa et al.

Status: open (until 01 Mar 2023)

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Laura L. de Sosa et al.

Laura L. de Sosa et al.

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Short summary
Olive groves are subject to enormous pressure to meet the social demands of production. In this work, we assessed how an additional source of organic carbon and an irrigation control can somehow palliate the effect of olive grove intensification by comparing olive groves under different management and tree densities. We observed that a reduced irrigation regimen in combination with compost from the oil industry's own waste was able to enhance soil fertility under a water conservation strategy.