Utilização de resíduos orgânicos como substratos para produção de mudas de alface

Abstract

The experiment was carried out in the greenhouse of the Federal Institute of Education, Science and Technology of Piauí - IFPI - Campus Uruçuí. The use of the organic residues available in rural properties for seedlings production constitutes an economically important source of nutrient, since it reduces the costs of acquiring substrata for this purpose, especially if the distance from the municipality of Uruçuí is considered To large centers, which, because of transport, increases the costs of acquiring agricultural inputs. Thus, the objective of this work was to evaluate combinations of organic residues in the preparation of substrates alternative to commercial for the production of seedlings of the Grands Rapids lettuce of the crespa group. The experimental design was a completely randomized design, with four treatments and five replications, with five plants evaluated per replicate. The treatments were: 1. commercial substrate - (control); 2. Soil + carbonized rice husk (CAC) + bovine manure; 3. Soil + CAC + goat manure; 4. Solo + CAC + chicken bed. Thirty days after the emergence of the crop, the evaluation of the root system length, shoot height, fresh mass of the root system and fresh shoot mass were evaluated. According to the results obtained and under the conditions in which this experiment was developed, it was concluded that the use of organic compounds can be used in a viable way as substrates for the production of lettuce cv. Large Rapids replacing the commercial substrate. The substrate composed of soil + charcoal rice husk + chicken litter, was the best substrate for the production of lettuce seedlings of cv. Grand Rapids