Floristic composition and ecological analysis of weed synusia in wheat depending on crop rotation | Floristicki sastav i ekoloska analiza korovske sinuzije psenice u uslovima plodoreda
2008
Nikolic, Lj., Poljoprivredni fakultet, Novi Sad (Serbia) | Vugo-Janjatov, V., Poljoprivredni institut Dr Petar Drezgic, Sremska Mitrovica (Serbia) | Knezevic, A., Poljoprivredni fakultet, Novi Sad (Serbia) | Milosev, D., Poljoprivredni fakultet, Novi Sad (Serbia) | Seremesic, S., Poljoprivredni fakultet, Novi Sad (Serbia)
The effect of crop rotation on the floristic composition of weed synusia in wheat was examined and an ecological analysis of weed synusia made, providing indication of the ecological characteristics of wheat plots at the Rimski Sancevi experimental field of the Instutute of Field and Vegetable Crops in Novi sad (Serbia). The investigated wheat stands with several variants of crop rotation were found to contain a total of 36 plant species, of which 11 were pure weeds, 23 were weedy ruderal species, one was a ruderal species and one was a weed of meadows and pastures. Of the 36 species found, only 7 were present in all variants of the investigation. The largest number of weed species (24), also in the highest densities, was registered in the non-fertilized two-field rotation. The overal biological spectrum included therophytes with 78%, geophytes with 17% and hemicriptophytes with 5%. The analysis of the present species for bioindicator values of the main environmental factors indicated moderate soil moisture and neutral to slightly acid pH. The present weed species were also indicative of a good provision of nitrogen and nitrogen-containing substances and favourable soil structure, i.e. favourable soil aeration. The analysis of ecological indexes for humidity, however, showed certain deviations in the variants of three-field rotation, four-field rotation and twelwe-field rotation.
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