Phytosociological Survey of Weeds on Degraded and Well-Managed Pastures: Agronomical and Ecological Implications

The objective of this research was to carry out a survey weeds in pastures the Middle Valley Paraíba do Sul, Rio de Janeiro State, Brazil, order subsidize weed management and pasture recovery. Weed identification plant count were carried with four levels degradation, classified as low (N1), moderate (N2), strong (N3) very (N4), five replications. Thirty-nine species identified distributed into16 botanical families. Poaceae, Asteraceae Fabaceae most relevant number density increased level degradation decreased. relative importance varied degraded pasture. main found N1 Melinis minutiflora, Desmodium incanum, Croton lundianus, Andropogon bicornis, Imperata brasiliensis; N2: Paspalum notatum, brasiliensis, Sida rhombifolia, incanum; N3: Eupatorium maximilianii, N4: Cynodon dactilon, brasiliensis. similarity index high, showing homogeneity among areas. predominant species, considering all areas, increasing importance: minutiflora notatum. Decision-making about applying control measures could be marked when reached or exceed average 3.58 plants m-2.