Vermiculita na composição do substrato do teste padrão de germinação de girassol

Abstract

The determination of the percentage of germination of the seeds is very important for their quality assurance and later commercialization. For the sunflower (Helianthus annuus) a negative correlation between the pattern test and the emergence in the field is observed, due to the high proliferation of fungi caused by the use of paper substrates. In this context, the objective was to propose a modification in the test, with the addition of vermiculite to the role of germination. The design was completely randomized, with five lots and three treatments (without vermiculite, with 30mL and 50mL of vermiculite), with evaluations executed at the 4th and 10th days after sowing, determining the percentages of normal, abnormal, damaged, deformed and Damaged seeds and hard, dormant and dead seeds. At the same time, the emergence of the seeds from the same lots of the sunflower hybrid, distributed in completely randomized blocks, with 20 trays with 5 liters of sand, was composed of the five lots of sunflower seeds with four replicates each. The evaluations were made during 10 days from the 4th day of sowing in order to count the emergence of seedlings. Therefore, the use of 50mL of vermiculite in the substrate composition reduces seed contamination and seedling death, being an alternative for the standard test.