Competitive analysis of soybean and sudangrass using replacement series design
Palavras-chave:
Sorghum sudanense (Piper) Stapf, Glycine max (L.) Merr, competição, planta daninha.Resumo
Competition is the best known form of direct interference of weeds on agricultural crops. However, there is relatively
little information on the competition of the weed sudangrass on soybean, which has been common in agricultural areas
in the southern of Rio Grande do Sul. The objective of this study was to evaluate the competition between sudangrass
and soybeans using replacement series experiments. The experiment was carried out in a greenhouse in a completely
randomized design with four replications. The treatments consisted of soybean and sudangrass associations. The
experimental units were 8-L plastic pots, in the proportions 0: 8, 2: 6, 4: 4, 6: 2, 8: 0, corresponding to 0, 25, 50, 75 and 100%
of the crop and weed respectively. Shoot, root and total dry matter and plant height were analyzed through diagrams
applied to replacement series and competitive indices. Soybean showed competitive superiority in coexistence with
sudangrass in relation to shoot, root and total dry matter. The intraspecific competition was more significant for the crop
and inter-specific competition was more important for the weed.
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