Interferência de Capim-Amargoso (Digitaria insularis) no desenvolvimento da cultura da soja

Abstract

A study was carried out to verify the influence of amaranthgrass (Digitaria insularis) on soybean plants. For this, the design was completely randomized in the factorial scheme 5x3, with 4 replications, under controlled conditions (greenhouse). The first factor consisted of a soybean plant living with bittergrass plants, with T0: the control (soybean plants only), T1: a soybean plant and a bittergrass plant, T2: A plant soybean and two plants of bittergrass, T3: a soybean plant and 3 plants of bittergrass and T4: a soybean plant and 4 plants of bittergrass. The evaluations occurred at three times, at 10, 25 and 35 days after emergence of soybean plants, which comprised the physiological stages V2, V5 and R2. The parameters analyzed were: plant height, root length, leaf area, root volume, fresh shoot and root mass, and dry shoot and shoot mass. There was interference of the weed in a study in the soybean crop, being able to be observed by the evaluated parameters, being the greater interference caused by the treatments three and four that consisted, respectively, in three and four weeds in coexistence with the soybean.