Germinação e potencial fisiológico de sementes de soja tratadas com molibdênio e cobalto

Abstract

Molybdenum (Mo) and cobalt (Co) are essential for seed germination and biological nitrogen fixation in soybean. The aim of this work was to study the effect of soybean seed treatment with molybdenum and cobalt on germination and seed physiological potential. Seeds of soybean, cultivars BMX Power RR and TEC IRGA, 6070 RR, were treated with doses of 0, 150, 300, 600 and 1200 mL (considering 100 kg ha-¹ seed) with Raynitro® (6 % Mo and 0,5 % Co), constituting five treatments. The experimental design was completely randomized with 4 replications for each cultivar. Treated seeds were evaluated by germination test, seedlings length of shoots and roots, seedling dry matter, cold test, accelerated aging, percentage and rate of seedling emergence in pots and in the field. Soybean seed treatment, cultivars BMX Potência RR and TEC IRGA 6070 RR, with Mo and Co does not alter the germination in the dose recommended by the manufacturer, however, allows benefits to seed exposed to low temperature conditions during early seed germination and conditions of high temperature and humidity, causing the acceleration of aging.