Fitossociologia de plantas daninhas em LATOSSOLO cultivado com diferentes cereais, manejados em integração lavoura pecuária

Abstract

This research aimed to identify the floristic composition of weed communities present in the agricultural area, cultivated with winter cereals and managed under integrated crop livestock. The study was conducted in the experimental area of the Western Parana State University, Campus Marechal Cândido Rondon, in EUTRUSTOX Eutrophic, with a randomized block design in bands, with four replications. The treatments consisted of three different winter cereals (oats IPR 126, triticale IPR 111 and wheat BRS Taruma) with different managements: ungrazed, one grazing and two grazings. The grazing was done in two days, until the residual height of 15 cm of each forage, using Holstein cows. The phytosociological survey was conducted in each plot 20 days after harvest of winter cereals. For characterization and phytosociological study of weed community was used as the sampling instrument, a square (0.50 x 0.50 m), released randomly within each parcel. Weeds were identified and quantified to determine the following characteristics: density, frequency, abundance, relative density, relative frequency, relative abundance and importance value index (IVI). In area, were identified 11 families and 16 species, highlighting the Poaceae and Asteraceae. The Commelina benghalensis (Commelinaceae) was the species with the highest IVI (62.67%), followed by Digitaria horizontalis (Poaceae) and Brachiaria plantaginea (Poaceae) with 58.28 and 55.50%, respectively. The different culturesand handlings did not influence the invasive species in the area.