Competição de soja guaxa em culturas de inverno

Abstract

Planting winter cultivars is a practice used by many producers for various purposes, such as cereal production for economic income, such as wheat, and forage production, green manure, nutrient cycling, soil cover, the use of winter crops to help loosen soil in the case of forage radish planting, and to reduce the incidence of invasive plants. This study aimed to evaluate the negative interference of the common weed, volunteer soybean, on the development of winter wheat and forage radish species, using increasing amounts of volunter soybean in relation to the control. The study was carried out in a greenhouse at the Federal Technological University of Paraná, Dois Vizinhos campus, with manual irrigation. Commercial wheat cultivars and another forage radish cultivar were used, where the plant species were evaluated separately. To carry out this study, pots with a capacity of 10 liters filled with red latosol, characteristic of the region, were used. An experimental design was used in a factorial arrangement (10 x 7), with increasing additions of three soybean volunter on evaluation days after sowing, with four replications. The variables that were analyzed were plant height every seven days until the 50th day. The number of leaves, leaf area, green and dry matter mass were analyzed at 50º. It was verified that there was competition and that, in general, the addition of soybean volunter plants at different densities had negative effects on the growth characteristics of the plant species of wheat and forage radish, mainly in relation to the leaf area variable and promoting etiolation and a decrease in the production of photoassimilates.