Testes de vigor para avaliação da qualidade de sementes de girassol

Abstract

Two experiments were installed. The first experiment was conducted to evaluate the physiological quality of sunflower seeds after hydration by the methods of humid atmosphere and soak substrate combined to 10 and 20°C to increase the water content of seeds for 15, 20 and 25%. For this, the initial physiological quality and after the moistening of the seeds was determined by germination tests and vigor. The second experiment was conducted to evaluate the precocity of the primary root emission of sunflower seeds as a vigor test. For this, four seed lots were tested for germination and vigor, among them, the primary root emission aiming percentage of emission and precocity index. From the results it was concluded that the method of soak substrate at 10°C to increase the water content at 15 and 20% was positive for moistening the seeds of high quality, although it has seen little reduction in seedling vigor. The test root emission after 48 hours was effective in classifying different levels of vigor lots of sunflower seeds