Germinação de sementes e crescimento de plântulas de soja sob diferentes tratamentos com bioestimulante a base de algas marinhas

Abstract

Seeds treatment aims to enable an improvement in the reproductive and development of cropes, and biostimulants, rich in micro and macronutrients, are used for this purpose. The present study aimed to analyze the influence on the treatment of soybean seeds with algae extracts, evaluating germination and seedling development. Two marine algaebased biostimulants, Ascophyllum nodosum and Rhodophyta ssp, were used in the treatment of seeds of two soybean cultivar, treated (Roundup Ready) and untreated cultivar. The doses used were 0,00; 0,55; 1,10; 2,20 ml L-1. The design used was completely randomized in a 2 x 4 factorial scheme, separately for treated and untreated seeds, with four replications for each treatment. For evaluation, germination speed index (GSI), shoot length (SL), root system length (RS), green mass (GM), dry mass (DM), normal seedlings (NS), abnormal seedlings were monitored (AS). Data were submitted to analysis of variance and Tukey's test with comparison (p<0,05). Seed treatments with marine algae biostimulant with different doses did not improve for the evaluations submitted to untreated seeds, except for the germination speed index and shoot length. Concerning the treated seeds, only the variable length of the root system and the shoot showed a difference between the products and between the doses.