Stimulate® na germinação de sementes, vigor de plântulas e, no crescimento inicial de soja, em condições de rizotron

Abstract

It was aimed the study and evaluation the effect of the vegetal bio regulator Stimulate® in the seed germination, seedlings vigor and in the initial growth of soybean plants (Glycine Max (L.) Merrill cv. BRS – Barreiras) under rhizotron conditions. The experiment was carried out at the Vegetal Physiology Laboratory and in greenhouse of UFRB Center of Biological, Environmental and Agricultural Sciences, from 2007 to 2008. The doses used were: 2,0; 4,0; 6,0; 8,0; 10,0 and 12,0 mL of Stimulate® kg-1 of seeds and as control (0,0) 6,0 mL H20 kg- 1)of seeds, applied directly in the seeds by leaf spraying (mL of Stimulate®) after dilution in water. Under laboratory conditions for seeds treatment, tests of seeds germination, seedlings, vigor and seedling emergence in sand were performed. In the greenhouse, under rhizotron conditions, it was assessed the soybean plant initial root growth, under leaf spraying two days from the sowing day (DAS). Simultaneously, in black 2-kilo polyethylene were sowed seeds treated with Stimulate® and untreated seeds. The originated plants were sprayed ( 2,0; 4,0; 6,0; 8,0; 10,0 and 12,0 mL of Stimulate® kg-1 of solution and as control (0,0) 6,0 mL of distilled water) in the tenth day after sowing (DAS), observing the plants height, number of leaves, stem, leaves and full dry mass, leaf area. The experimental design was entirely random with seven treatments and four repetitions. The results were submitted to polynomial regression variance analysis. The Stimulate® through seeds is efficient in the production of normal seedlings, in the reduction of abnormal seedlings and of soybean stiff seeds. The bio regulator Stimulate® is able to promote the initial growth of soybean plants, increasing the average height and dry mass.