Qualidade fisiológica de sementes de soja em função de tratamento químico e das condições de armazenamento

Abstract

Seed treatment provides, among other advantages, protection against insects and fungi during storage of seeds and establishment of plants in the field. However, it is believed that some active ingredients, applied to protect the seeds during storage, may impair the physiological quality of the same, even though the recommended doses observed. Thus, the aim of this study was to evaluate the physiological quality of soybean seeds treated with insecticides and fungicides over 120 days of storage in controlled and uncontrolled environment. The work was conducted on the premises of ranch marajó using soybean cultivar W7901 RR, produced in the 2014/2015 harvest, which were submitted to treatment with tiofanato metílico + fipronil tiametoxam, abamectina, neocotinoides and bifentrina+imidacloprido. After treatment, the seeds were stored for 120 days in two different conditions: conventional warehouse with an average temperature of 21 ° C, and cold chamber, with an average temperature of 16 ° C. Soon after treatment and every 30 days were carried out germination tests, field emergence and accelerated aging. The experiment consisted of two separate tests: the first conventional warehouse and the second chamber-fia. In both treatments were a combination of products used for seed treatment and storage periods, in a factorial 6x9, adopting a completely randomized design with four replications. The seed treatment can be used up to 120 days before germination without significantly changing the germination of these, provided they are stored in cold storage. Seed treatment with abamectina results in less decreased vigor of seeds stored up to 120 days, both in conventional warehouse as in cold storage.