Sourgrass (Digitaria insularis) is one of the main species causing significant losses in Brazilian soybean production systems. Thus, this paper aimed to evaluate sourgrass interference on soybeans grown under Cerrado conditions. Three field experiments were conducted, of which the first two (E1 and E2) simulated sourgrass after pre-sowing burndown, using plants already emerged by the time soybeans were sown; whereas the third (E3) simulated both sourgrass and soybeans emerged simultaneously. Both E1 and E2 were conducted in a randomized complete block design (RCBD) with five treatments based on sourgrass infestation densities (0, 2, 4, 6, and 8 plants m-2) and four replications. In turn, E3 was also carried out in an RCBD but with treatments arranged in a 2 x 5 factorial and four replications. The first factor comprised two soybean cultivars, while the second was sourgrass density levels, just as in E1 and E2. The results showed that increasing sourgrass densities reduced soybean yield regardless of the plant growth stage when the crop was sown. Yield losses were higher when sourgrass plants were already established by the time soybean was sown. Soybean yield losses reached up to 80% under higher sourgrass infestation levels.
A infestação de capim-amargoso (Digitaria insularis) é responsável por grande parte dasperdas de produtividade em lavouras de soja (Glycine max). Entretanto, pouco se temestudado sobre a interferência desta espécie na produção de grãos para sementes. O objetivodeste estudo foi avaliar a interferência de capim-amargoso sobre a qualidade de sementes desoja. Um experimento foi instalado para estudar cinco densidades de capim-amargoso (0, 2,4, 6 e 8 plantas m-2) em duas cultivares (Garra IPRO® e ST797 IPRO®). Os danos na maiordensidade avaliada (8 plantas m-2) foram de perda de 16% no número de sementes normais,32% a mais de sementes mortas e 16% de perda na germinação para a cultivar ST797IPRO®. A cultivar Garra IPRO® não apresentou diferenças nestas variáveis, sugerindomelhor habilidade competitiva em relação a cultivar ST797 IPRO®. Quanto maior ainfestação de capim-amargoso na soja, maiores as chances de perda na qualidade desementes. O nível de dano às sementes pela presença de capim-amargoso depende dahabilidade competitiva de cada cultivar.
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