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    Soil nematode communities in South African fruit orchards show that organic and conventional farming practices have similar impacts on soil health. Further research is needed to use nematodes as soil health indicators.

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    Area of Science:

    • Agricultural Science
    • Soil Ecology
    • Nematology

    Background:

    • Global population growth necessitates enhanced food production, making sustainable agricultural practices crucial.
    • Soil degradation due to poor management practices threatens future food security.
    • Deciduous fruit producers in South Africa are increasingly recognizing the importance of soil health and ecology for sustainable production.

    Purpose of the Study:

    • To investigate soil nematode community structure and function in organic versus conventionally managed deciduous fruit orchards.
    • To determine the abundance, diversity, and functionality of free-living and plant-parasitic nematodes.
    • To establish a basis for using nematodes as indicators of soil health in fruit orchards.

    Main Methods:

    • Quantification and identification of nematodes to family level in organic and conventional apricot and organic apple orchards.
    • Analysis of nematode trophic groups, including herbivores, fungivores, and carnivores.
    • Calculation of the Maturity Index (MI) and Plant Parasitic Index (PPI) to assess soil condition.

    Main Results:

    • Herbivores were the dominant nematode trophic group across all surveyed orchards.
    • Organic apple orchards had the lowest abundance of herbivores and fungivores, and the highest number of carnivores.
    • Organic apricot orchards exhibited higher numbers of plant-parasitic nematodes compared to conventional ones.
    • Nematode faunal analysis indicated enriched and structured soil conditions across all sites.
    • While conventional apricot soil showed the highest species richness, organic apple soil had the most even distribution of nematode families.

    Conclusions:

    • Different orchard management practices (organic vs. conventional) did not result in significant differences in soil nematode community composition and structure.
    • Nematode community indices (MI and PPI) suggest disturbed soil conditions in all studied orchards.
    • Nematodes show potential as indicators of soil health, but further research is needed to refine their application in fruit orchard management.