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Soil amendments with plant materials from  Medicago  species are widely acknowledged for a suppressive effect on plant-parasitic nematodes but their impact on beneficial components of soil nematofauna is still unknown. A study on potted tomato was carried out to investigate the short-time effects on the overall nematofauna of dry biomasses from six different  Medicago  species, i.e.,  M. sativa ,  M. heyniana ,  M. hybrida ,  M. lupulina ,  M. murex  and  M. truncatula , incorporated to natural soil at 10, 20, or 40 g kg −1  soil rates. All amendments resulted in a significant decrease of the total nematofauna biomass, whereas total abundance was significantly reduced only by  M. heyniana ,  M. hybrida , and  M. lupulina  biomasses. Almost all the  Medicago  amendments significantly reduced the relative abundance of plant-parasites and root fungal feeders. All amendments significantly increased the abundance of bacterivores, whereas fungivores significantly increased only in soil amended with  M. heyniana ,  M. lupulina  and  M. sativa  plant materials.  Mesorhabditis  and  Rhabditis  were the most abundant genera of bacterivores, whereas  Aphelenchoides  and  Aphelenchus  prevailed among the fungivores. Predators were poorly influenced by all the tested  Medicago  biomasses, whereas the abundance of omnivores was negatively affected by  M. heyniana  and  M. lupulina . Values of the Maturity Index and Sum Maturity Index were reduced by treatments with  M. heyniana ,  M. hybrida ,  M. lupulina  and  M. sativa  plant materials, whereas most of the tested amendments decreased values of the Channel Index while increasing those of the Enrichment Index. Enrichment and bacterivore footprints raised following soil addition with  Medicago  biomasses, whereas composite and fungivore footprints were significantly reduced. According to their overall positive effects on soil nematofauna, amendments with  Medicago  plant materials or their formulated derivatives could represent an additional tool for a sustainable management of plant-parasitic nematodes.

Short-Time Impact of Soil Amendments with Medicago Plant Materials on Soil Nematofauna