Uncultivated areas

Uncultivated areas

1. Identification and framework

Uncultivated areas include marginal agricultural spaces, fallows, embankments, plot edges, watercourses, hedgerows, scrubland and clearings. Although they do not constitute a crop, they are part of the agricultural mosaic and perform essential ecological functions. They may be permanent or temporary, resulting from management choices, soil and climate limitations or soil conservation practices.

2. Agricultural and environmental importance

These areas contribute to:

• conservation of biodiversity, providing habitat for beneficial insects, pollinators, birds and small mammals.
• natural regulation of pests, by sustaining populations of natural enemies that act on the adjacent crops.
• soil protection, reducing water and wind erosion.
• improvement of water infiltration and retention, favouring aquifer recharge.
• ecological connectivity, functioning as biological corridors.
• support for spontaneous flora useful for ecological restoration or as an indicator of soil quality.

3. General characterisation of the vegetation

The vegetation is mostly spontaneous and includes annual and perennial herbaceous plants, shrubs and scrub in less intervened areas, ruderal species in disturbed areas and riparian vegetation along watercourses. The floristic composition directly influences the associated fauna and the ecological potential of the area.

4. Soil and climate requirements

These areas reflect the natural conditions of the site, frequently developing in poor, stony, compacted soils or those subject to waterlogging. The vegetation adapts to the regional climate, including drought-tolerant species, while in humid or shady zones hygrophilous species predominate. Management should take these limitations into account to avoid further degradation.

5. Main pests and phytosanitary problems

Uncultivated areas can serve as a reservoir of pests such as aphids (Aphididae), leafhoppers (Cicadellidae) and polyphagous caterpillars, harbour host plants of diseases that affect nearby crops and develop perennial weeds such as Sorghum halepense or Cynodon dactylon. Management should balance ecological value with the prevention of phytosanitary risks.

6. Main ecological benefits and associated risks

• Benefits: include increased functional and genetic diversity, support for pollinators and beneficial fauna, reduction of pest pressure through natural predators and improvement of water and soil quality.
• Risks: include the spread of aggressive weeds, increased fire risk in unmanaged scrub areas and shelter for pests or vectors when not monitored.

7. General management and good practices

Periodic maintenance is recommended (mowing, shredding or controlled grazing), preservation of hedgerows, watercourses and riparian vegetation, selective control of problematic weeds, creation of ecological strips between crops, phytosanitary monitoring next to sensitive crops and avoiding deep tillage that promotes erosion.

Bibliographic references

• EPPO Global Database – information on spontaneous species and hosts.
• CABI – Invasive Species Compendium and spontaneous flora factsheets.
• FAO – Guidelines on Sustainable Land Management and documents on agricultural biodiversity.
• Stoate, C. et al. Ecological impacts of agricultural intensification in Europe. Environmental Management.
• Benton, T. G., Vickery, J. A., & Wilson, J. D. Farmland biodiversity: is habitat heterogeneity the key? Trends in Ecology & Evolution.