Avaliação da mistura solo argiloso, humus e cinzas de caldeira na produção de mudas de alface crespa (Lactuca sativa L. crespa) utilizando técnica DCCR

Abstract

Industries that use biomassburning boilers have generated large amounts of ash that can cause negative environmental impacts on the environment. The objective of this work is to verify if it is possible to reuse them in the production of crispy lettuce seedlings (Lactuca sativa L . curly), using the rotational central composite design (DCCR) method, which is a statistical technique to determine the best proportion of clayey soil, humus and boiler ash, aiming at a sustainable and aggregating destination for the residue. For this, the experiment was carried out using dosage variations of the compost formed by gully earth (clay soil), earthworm humus and boiler ash from a dairy industry in the city of Londrina-PR. The biomass used in the boiler is eucalyptus. Twenty dosages were carried out in triplicate. The experiment was carried out in the open air in the city of Londrina-PR. Three seeds were placed per bag, they were harvested thirty days after germination, and the aerial and root parts were weighed. After that, they were dried in an oven and weighed again. Analyzes of each dosage were also carried out, using the technique of XRay Fluerescence by dispersive energy, in order to obtain their chemical characteristics. From the results it was possible to conclude that the higher the dose of earthworm humus, the better the development of the plants. The clayey soil proved to be inefficient in the substrate, with results showing that its use in the substrate composition is not interesting. The boiler ash added calcium and potassium in the substrate, in addition to neutralizing the aluminum, the ash proved to be interesting to use a dosage in the range of 0.15 g.100g1. The treatment that obtained the best result was the one that used 0.26 g.100g1of soil, 0.40 g.100g1 of humus and 0.24 g.100g1 of clayey soil.