Efeito da densidade e distância de plantas daninhas no desenvolvimento de mudas pré-brotadas (MPB) de cana-de-açúcar

Abstract

Among the factors that limit the full expression of the productive potential of sugarcane, the interference caused by the lack of weed control stands out. Thus, the objective of this work was to evaluate how the density and distance of Ipomoea nil and Digitaria horizontalis influence the development of pre-sprouted seedlings (MPB) of the sugarcane variety IAC SP 95-5000. The experimental design, for each weed species, was completely randomized (DIC) in a 4 x 5 + 1 factorial scheme, with four weed densities coexisting with MPB (1, 2, 4 and 8 plants, equivalent to 10 , 20, 40 and 80 plants m-2), five distances from the MPB (2, 6, 12, 18 and 24 cm) and a control without the weed, with four repetitions. MPBs were transplanted in 30 L pots and weeds were sown. After the flowering of the weeds, height, leaf area, dry biomass of the aerial part and nutritional analysis of the MPB leaf tissue were evaluated. The MPB furthest from D. horizontalis and I. nil showed greater development. Regarding the leaf area, higher values ​​were found when the plants were 24 cm away from the weeds. The density and distance between D. horizontalis and Ipomoea nil in relation to MPB were affected by competition for macro and micronutrients, especially at higher weed densities.