Ascophyllum nodosum (L.) Le Jolis and its effects on the growth and development of soybean

ABSTRACT: The objective was to evaluate the effect of foliar application of commercial products based on extracts of Ascophyllum nodosum algae in two applications in phenological stages V4 and R1 and three in V4, R1 and R4 of soybean. The experiment was installed on 11/16/2022. Products based on A. nodosum algae (Acadian®, Phosamco Bio®, Bioalgas® and Phylgreen®) were applied at a dose of 1 L ha-1, in two and three applications at phenological stages V4 and R1 and V4, R1 and R4, respectively, organized into nine treatments. In the first application (12/19/2022), the weekly collection of two plants per plot began, obtained the plant height and green mass of the plant. At harvest, plant height, number of productive nodes per plant, plant mass, number of pods per plant, grain mass per plant and number of grains per plant were obtained from 10 random plants. The two central rows of each experimental unit were harvested and threshed, and together with the grain mass of the 10 plants, the thousand grain mass and grain yield were obtained. The data were subjected to analysis of variance and grouping of means. Applications of A. nodosum extracts provide greater height and mass in plants. Acadian®, Phosamco Bio®, Bioalgas® and Phylgreene® applied to the aerial part increase grain yield. Two applications of Phosamco Bio® provided superiority for all characteristics evaluated.