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The aim of this study was to evaluate the weed populations of sweet sorghum hybrid CVSW 81198 and its interference capacity in increasing periods with and without weeding. Two experiments were carried out, one during the summer and another during the autumn in the municipality of Jaboticabal, Sao Paulo state, Brazil. For each experiment, two treatment groups were established: one consisting of increasing periods without weeding and another of increasing periods with weeding. Periods were 0, 4, 7, 14, 21, 28, 35, 42 and 56 days after emergence (DAE) in the summer experiment and 0, 4, 7, 14, 21, 28, 35, 42, 49, 56, 63 and 100 DAE in the autumn experiment. Phytosociological studies of the weed community were carried out in each treatment, with emphasis on the importance index of each weed population. Under the experimental conditions, Amaranthus spp. and Alternanthera tenella were the most important species in the weed community of sweet sorghum grown during summer and autumn, respectively. With the natural infestation of the weed community, sorghum hybrid CVSW 81198 did not suffer interference in crop development and stem productivity even without weeding throughout the crop cycle.

SORGHUM HYBRID CVSW 81198 AND ITS WEED COMMUNITY IN PERIODS WITH AND WITHOUT WEEDING