Efeito de resíduos de fedegoso, silagem de milho e de bagaço de cana-de-açúcar sobre a cultura da alface

Abstract

The lettuce crop is one of the main vegetables produced worldwide and on which different management techniques are applied that can cause interference, including allelopathy. The use of residues in production systems is a common practice among family farmers, who seek to introduce straw in their gardens and optimize fertilizer costs. It is also common to observe the presence of weeds in the means of production, which have different ways of competing for resources present in the environment. Thus, the aim of this work was to analyze the effect of different concentrations of sugarcane bagasse, fedegoso (Senna obtusifolia) and corn silage residues on lettuce. The experiment was carried out in a greenhouse at the Federal University of Fronteira Sul, conducted in a completely randomized design, using four replications with five different concentrations of crude powder extracts (0%, 1%, 5%, 10%, 20%). The evaluation was carried out by growing plants in pots, determining the production of fresh and dry mass of shoots and roots, stem diameter and counting the number of leaves when the plants were at the point of harvest, 54 days after transplantation. After analysis, it was possible to conclude that there was no significant effect for the variables stem diameter and dry mass of the root system in any of the treatments, in addition, the fedegoso extract, even at low concentrations, provides different effects on the variables fresh mass of the system root mass, fresh mass of shoots, dry mass of shoots and number of leaves of lettuce plants. For the other extracts used, the results are varied.