Tratamento de sementes de canola com zinco: potencial fisiológico de sementes e estabelecimento inicial de plantas

Abstract

Seed zinc treatment is efficient technique to assure availability and absorption of this nutrient in the early stages of plant growth. The aim of this study was to evaluate the influence of zinc seed treatment with different doses, on the seed physiological potential as well as in the initial establishment of canola plants. Seeds of canola, cultivars Hyola 61 and Hyola 433, each one represented by a lot, were treated with zinc at six doses (0, 1, 2, 3, 4 and 5 mL of the commercial product formulated per seed kg-¹ ). The experimental design used was a completely randomized with four replications for the physiological seed potential tests and randomized blocks for the initial plant establishment evaluations. The evaluation of the seed physiological potential was performed by germination, first count of germination, accelerated aging, speed of germination, shoot and root length seedling and dry seedling weight, and the initial establishment of plants was assessed by seedling emergence, index of seedling emergence velocity, shoot and root plant length and dry plant weight. The results were submitted to analysis of variance and means comparison was performed by Tukey test at 5% probability, in a factorial scheme 2x6 (cultivars x doses). For the quantitative factor (zinc doses) regression equations were adjusted. Canola seed treatment with 2 mL kg-¹ seeds with Quimifol 78 affects positively seed germination and seed physiological potential, as well as the initial establishment of plants, resulting in a higher percentage and speed of plant emergence.