Macroalga Ascophyllum nodosum no tratamento de sementes de soja e sua implicação no vigor de plântulas

Abstract

Soybean is a legume of great commercial interest, and the use of bioinputs as a source of biostimulants can be a sustainable alternative to seed treatment in order to contribute to the germination and vigor of seedlings. Thus, the aimed of this study was to evaluate the effect of doses of brown macroalgae Ascophyllun nodosum in the treatment of soybean seeds on germination and seedling vigor. Two tests were carried out, the I in the laboratory and the II of emergency in the field. In both trials, six doses of A. nodosum extract: 0, 1, 2, 3, 4, and 5 mL kg of seed-1 were tested, with a completely randomized experimental design. Seedlings from seeds treated with 5 mL kg-1 of Ascophyllum nodosum extract in the laboratory had higher shoot and root biomass and growth. Under field conditions, the dose of 3 mL kg-1 promoted an increase in root and shoot biomass. In addition, at a dose of 5 mL kg-1 , it was possible to observe an increase in the emergence speed index, seedling length and chlorophyll index. Thus, the use of Ascophyllum nodosum extract was beneficial to soybean seedlings, providing better growth characteristics.