Avaliação da densidade de semeadura, poder germinativo de sementes de arroz em função de diferentes velocidades de semeadura

Abstract

The crop yield is directly related to quality and seeding efficiency. The seederfertilizer machines plays a key role in the production process, since the sowing operation is a major factor for success in establishing a crop. The speed and the distribution mechanism in sowing machines can directly interfere with seed quality, often showing no visible damage, affecting seed germination, reducing the stand and vigor of the plants in the field. This study aims to evaluate the behavior of the metering system of a seeder-fertilizer at different speeds of displacement, as the seeding rate and the germination of rice. The experiment was carried out from September to October 2014, in an area located as irrigated rice crop in the farming São João da Boa Vista, in the municipality of Itaqui - RS. Five speeds were evaluated (2, 4, 6, 8, and 10 km h-¹) in a seeder-fertilizer. He held the collection of seeds at the exit of metering system type rotor helical slotted, proceeding to the analysis of samples in the laboratory. The experimental design was a randomized block consisting of five treatments (speed) and four blocks, and the data were submitted to the Tukey test at 5% error probability. The results showed that the increase in tractor-seeder set forward speed did not differ statistically in seeding rate and germination of rice seeds. It was observed that the increase in speed at sowing operation considerably increases the operating performance, but in rice fields caution is advised, since the density and germination of the seeds are not the only factors determining the final quality of operation sowing.