Navegando por Autor "Fávaro, Bruna de Lima"

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    Potencial fitorremediador de adubos verdes em solos contaminados com herbicidas
    (Universidade Estadual do Norte do Paraná, 2019-07-31) Fávaro, Bruna de Lima; Conte, Ana Maria; http://lattes.cnpq.br/1406959857364094; Conte, Ana Maria; http://lattes.cnpq.br/1406959857364094; Silva, Francisco Carlos Mainardes da; http://lattes.cnpq.br/9683269855531828; Lima, Claudinei Paulo de; http://lattes.cnpq.br/8352085023073169; Souza, Juliana Aparecida de; http://lattes.cnpq.br/1781930088707636; Matsumoto, Leopoldo Sussumu; https://orcid.org/0000-0001-5102-545X; http://lattes.cnpq.br/0857955043436449
    Remediation of contaminated soils is necessary, but traditional remediation techniques are very costly. Phytoremediation is a simple and low-cost technique, where different plant species can be used, among which are green manures, which also improve the physical, chemical and biological conditions of the soil, bringing benefits such as nutrient cycling and reduction of water evaporation in the soil. This study aimed to verify the efficiency of green manures as phytoremediating plants in soils contaminated with herbicides, through analysis with a bioindicator crop. The experiment was conducted in a protected environment at the Experimental Farm Prof. Dr. Eduardo Meneghel Rando of the State University of Northern Paraná, Campus Luiz Meneghel, in the municipality of Bandeirantes – Paraná. The experimental design was in randomized blocks, with a 6×2×3 scheme, comprising 5 green manures: 2 species of Crotalaria (Crotalaria breviflora and Crotalaria spectabilis), black velvet bean (Mucuna pruriens), pigeon pea (Cajanus cajan), forage turnip (Brassica rapa subsp. rapa), plus 1 uncovered soil (control); in 2 soil texture classes: very clayey and medium texture; with the application of 3 herbicides considered as contaminant agents: sulfentrazone, clomazone and atrazine, at doses recommended for sugarcane, and soybean (Glycine max) as the bioindicator plant. The experiment was carried out in pots with a capacity of 7 L, filled with soils collected at a depth of 0–20 cm. Sowing of the green manures was performed 20 days after herbicide application, and the crops were grown for 60 days. At the end of the experiment, the phytoremediating plants were evaluated for number of individuals per pot, height, stem diameter, number of leaves, green mass and shoot dry mass; after this evaluation, soybean was sown. The crop was maintained for 50 days and then evaluated for number of plants per pot, height, stem diameter, number of leaves, green mass and shoot dry mass, and visual phytotoxicity. Data were compared by analysis of variance, at a 5% probability level, using SAS software. The results obtained with green manures allowed the conclusion that phytoremediation performance was better in medium-textured soils than in clayey soils, and that the herbicides clomazone and atrazine are more susceptible to phytoremediation when compared to sulfentrazone. After introduction of the bioindicator crop, it presented relatively consistent values, showing that the green manures possess phytoremediation potential for the herbicides tested. The bioindicator also showed better development in medium-textured soils when compared with very clayey soil.