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Journal of Soils and Sediments

, Volume 17, Issue 3, pp 873–888 | Cite as

Soil loss in an olive grove in Central Spain under cover crops and tillage treatments, and farmer perceptions

  • Blanca SastreEmail author
  • Celia Barbero-Sierra
  • Ramón Bienes
  • Maria Jose Marques
  • Andrés García-Díaz
Sediments, Sec 3 • Hillslope and River Basin Sediment Dynamics • Research Article

Abstract

Purpose

Soil erosion is a threat for the sustainability of the grove production all over the world, and olive groves are where the highest erosion is achieved. This study aimed to (1) evaluate soil loss from water erosion in microplots (1 m2) under natural rainfall events in an olive grove managed with tillage and three different cover crops; (2) determine the main climatic factors on soil loss and selective transportation; and (3) survey the willingness of local farmers to adopt cover crops.

Materials and methods

Over four hydrological years (2010 to 2014), tillage and three cover crop treatments have been assessed in a sloping olive grove in the Mediterranean area, in a semiarid climate and gypsiferous soil. The treatments were tillage (once a year), two annual covers (barley and legumes) and a permanent cover (Brachypodium distachyon). Soil loss was collected after each rainfall event, dried and weighted. Rainfall data was recorded and soil cover (%) was determined. Organic carbon (% OC) and texture were measured for sediments of tillage treatment to study their selective transportation. Local farmers were polled regarding their knowledge of the biophysical factors that affect soil conservation, their management practices and their willingness to adopt sustainable land management practices as cover crops.

Results and discussion

The tillage treatment exhibited the highest soil loss (6.8 t ha−1 year−1). Cover crops significantly reduced soil loss: 40 % for legumes, 60 % for barley and permanent cover led to an 80 % decrease (1.4 t ha−1 year−1). The soil loss depends mainly on the soil cover and kinetic energy of rainfall events. Vegetation cover higher than 40 % in autumn and spring was essential to limiting soil loss, even under heavy events. Mobilised sediments were enriched 2.4 times in OC and 1.6 in the clay fraction. In spite of the well-known benefits of cover crops in soil conservation, local farmers do not use them. A lack of environmental education and awareness has been detected.

Conclusions

Tillage in olive groves produced unsustainable rates of soil loss, while permanent cover demonstrated high efficiency. Gypsiferous soils are vulnerable to water erosion processes if they are not protected by vegetation. Farmers should adopt tailored soil cover practices during spring and autumn, when the soil loss is higher. A few farmers use sustainable soil management techniques, and therefore cover crops in olive groves are rare in Central Spain because farmers are reluctant to change.

Keywords

Cover crops Erosion Olea europaea SLM practices Social approach 

Notes

Acknowledgements

This work was supported by the Madrid Institute for Rural, Agricultural and Food Research and Development-IMIDRA under Grant FP12-CVO and the Madrid Region-AGRISOST Project.

Supplementary material

11368_2016_1589_MOESM1_ESM.doc (74 kb)
ESM 1 (DOC 74 kb)

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© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  1. 1.Applied Research and Agricultural ExtensionMadrid Institute for Rural, Agricultural and Food Research and Development—IMIDRAMadridSpain
  2. 2.Ecology DepartmentAutonomous University of MadridMadridSpain
  3. 3.Geology and Geochemistry DepartmentAutonomous University of MadridMadridSpain

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