Teste de vigor em sementes de azevém em diferentes substratos e profundidades de semeadura

Abstract

The inadequate physiological quality of ryegrass seeds has resulted in pastures with inadequate plant stands for soil cover and, especially, forage exploitation. In this sense, the main objective of this work is to propose a vigor test for ryegrass seeds of easy application and low cost. For this purpose, it was proposed to test different sowing depths (0.5, 1.0, 1.5, 2.0, 2.5 and 3 cm) on three different substrates (sand, coconut fiber and charcoal rice husk) to differentiate The physiological quality of 4 lots that presented similarity to the germination and humidity test, but differences as to vigor from the field emergency analysis, thousand seed weight, accelerated aging, first germination count and electrical conductivity. These tests were used to rank the lots according to the vigor. The work will be conducted in the Didactic Laboratory LDAS Seed Analysis at the “Faculdade de Agronomia Eliseu Maciel (FAEM), Universidade Federal de Pelotas”. The experimental design was a completely randomized block design. The data were submitted to analysis of variance through the F test and the means, compared to each other by the Scott-Knot test, at 5% probability. The results demonstrated that sowing depth was an efficient test to determine the vigor of annual ryegrass seeds, especially when the substrates were sand and coconut fiber. The variables that best expressed the vigor of the annual ryegrass seed sown at different depths were the emergence of seedlings and the rate of emergence speed. From the emergence percentage of seedlings sown in 2.5 cm sand and coconut fiber 2.5 and 3 cm depth, it was possible to determine the vigor of annual ryegrass seeds. However, when the response variable was the seedling emergence rate index, the most interesting seeding depth to determine seed vigor was 2.5 cm, when the substrate was sand and 3 cm when the substrate was coconut fiber.