Testes de vigor e tratamento de sementes de cevada com nutrientes

Abstract

This research was divided into two studies. Study I aimed to determine the appropriate conditions for conducting the electrical conductivity and accelerated aging tests in the evaluation of the physiological potential of barley seeds, cultivar BRS Cauê. Six batches of barley seeds were used. One thousand seed weight, water content and germination tests, first germination count, shoot and root length, shoot and root dry mass, accelerated aging (41°C and 45°C) in the periods were determined. 24, 48, 72 and 96h, electrical conductivity in seven periods (1, 2, 3, 4, 6, 8 and 24 h), three numbers of seeds (25, 50 and 75) and three volumes of deionized water (50, 75 and 100mL) and field emergency. The first germination count, traditional accelerated aging, root length and seedling emergence tests were efficient in ranking seed lots at different vigor levels. It is concluded that the electrical conductivity test with a period of one hour of imbibition, using 75 seeds and 50mL of water, was efficient in classifying barley seed lots. The accelerated aging test after 48 hours of seed exposure to temperatures of 41°C and 45°C was efficient in classifying barley seed lots. Study II aimed to evaluate the effect of seed treatment with the nutrient complexes: Packseed® 0.70% Zn, Packseed® 1.50% Zn and Ultrazinco® 3.00% Zn, in five doses, on storability and on the physiological performance of barley seeds. Seeds from a lot of barley seeds were used. The mass of a thousand seeds, water content, germination test, first germination count, shoot and root length, shoot and root dry mass, accelerated aging and field emergence were determined. It is concluded that the treatment of barley seeds with nutrient complexes favors the physiological quality of the seeds. The most efficient doses in favoring the physiological quality of barley seeds for the nutrient complexes Packseed 0.70% Zn, Packseed 1.50% Zn and Ultrazinc 3.00% Zn varied, respectively, between 1.68 and 2.33mL.kg-1 of seeds, 1.97 and 3.00mL.kg-1 of seeds and 1.50 and 2.32mL.kg-1 of seeds. Seeds treated with the three nutrient complexes showed a reduction in physiological quality after 21 days of storage.