Incidence of weeds in areas of extensive pastures located in Roraima

Abstract

In order to evaluate the incidence of weeds in different pasture areas in Roraima, also seeking to identify whether the type of pasture suppresses the appearance of any species, an experiment was carried out in the period from May to June 2021. The diversity in numbers of weed species was evaluated in three selected areas: 1 – area with brachiaria grass (Brachiaria brizantha), 2 – area with Mombasa grass (Panicum maximum) and 3 – unplanted area. In the area without cultivation, 19 weed species were identified, with the species  E. indica, E. colonum, E. plana, M. pudica, B. plantaginea and S. arundinaceum being the most frequent. In the area planted with B. brizantha, ten species were identified, of which R. nervosa was the most predominant. In the area cultivated with Panicum maximum, eight species were collected, and the species: B. Plantaginea, C. prostrata and S. acuta were the most predominant in this evaluated area. There was statistical variation between species in each area, indicating that the type of vegetation and/or cultivation influences weed suppression, which in this study was more evident in areas with pasture.

DOI:https://doi.org/10.56238/uniknowindevolp-033