Despite the importance of biodiversity in maintaining and improving the stability of natural and agricultural ecosystems, it seems that improving the functioning of ecosystems will be achieved if the increase in species diversity is accompanied by an increase in functional diversity of species. In this study, for both crops, all provinces of the country were classified into three groups in terms of weed diversity. In general, the diversity of weeds in wheat fields was more than sugar beet. Differences in crop management practices (fertilization and use of pesticides) are the most important determinants of weed species composition and consequently their diversity. Agronomical operations change the diversity, abundance and species composition of weeds.

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