Abstract
The main objective of managing agricultural soil is maintaining soil fertility, in order to stimulate biological activity in the soil. The aim of this study was to determine variability in the presence and number of genera of nematodes, trophic structure and indices of biodiversity in the soil under conventional and organic olive farming. Research was conducted in the area of Porec in Istria, Croatia, through 5 years (from 2007 to 2011) in conventional and organic olive farming system. Total of 49 nematode genera were established in this study, 42 genera in conventional and 44 in organic farming system. Average number of genera over the investigated period in 100 g of soil were 14 in conventional and 17.10 in organic farming system and differ significantly in between. Trophic group analyses showed the dominance of plant parasitic nematodes in the conventional olive farming, and bacterivorous feeding nematodes in organic olive farming. Biological diversity indexes (H', N1 and λ) didn't differ significantly between conventional and organic farming.
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