POTENCIAL AGRONÔMICO DO USO DE EXTRATOS DE ALGAS MARINHAS VIA TRATAMENTO DE SEMENTES NA CULTURA DA SOJA

Abstract

The objective of this work was to evaluate the physiological performance of soybean seeds of the cultivar NS 7901 treated with different products based on seaweed extract at different doses. Seven formulations based on Lithothamnium spp. (1), Ascophyllum nodosum (2), Ascophyllum nodosum (3), Ascophyllum nodosum (4), Kappaphycus alvarezi (5), Solieria spp. (6) and a formulation with 55% brown algae, 40% red algae and 5% green algae (7). Each formulation was evaluated at doses of 50, 100, 150, 200, 250 and 300 mL/100 kg of seeds. The tests were carried out in a greenhouse in a completely randomized design (DIC), with 7 treatments with 10 replications for each treatment and 1 plant per plot. The efficiency of the products was evaluated based on the emergence speed index (IVE), plant height, root length and volume, shoot and root dry mass. The experiment was concluded 20 days after sowing and the data were submitted to analysis of variance, and their means were compared by the Scott-Knott test at 5% probability. Among the formulations evaluated, only 1 and 2 differed from the control based on the variables analyzed. The extract of Lithothamnium spp. (formulation 1) promoted an increase in root length, root volume and shoot dry mass. The Ascophyllum nodosum extract (formulation 2) promoted an increase in the emergence speed index, root length, and root dry mass. The other formulations had no effect on the variables studied. The application of formulations based on extracts of Lithothamnium spp. and Ascophyllum nodosum algae via seed treatment has shown to bring benefits in the initial development of soybean seedlings.