Peliculização e tratamento químico de sementes de algodoeiro

Abstract

Physiological and sanitary quality of cotton seeds are decisive factor to establish an ideal stand in the field. The chemical treatment is necessary to preserve the sanitary quality and to obtain a better development performance in the field. Researches on chemical treatment are liberally conducted, which film-coating technic has been used to get better adherence of these chemical products in the seeds. In this study, during 8 months, it was evaluated the physiological and sanitary quality of cotton plant seeds in 4 lots from different varieties of cotton plants, two lots of Delta Opal and other two lots of Sure Graw, chemically treated and covered with 2 types of commercial films, AG201 and TGBP1080. The seeds were treated with a mixture of the fungicides carboxin+thiram and the insecticide imidacloprid, in dosages of 2,5ml/Kg+2,5ml/Kg and 5ml/Kg+5ml/Kg, both treatments added with 2ml/Kg of the films. The treatments were evaluated by tetrazolium test, germination test, emergence test on trays, speed of emergence test, cold test and sanity test. It could be conclude that, the treatment using 5ml/Kg of the fungicides and insecticide in equal dosage, has had eficiency on controlling fungus and its utilization can be used in high quality seeds stored for until 8 months. The film-coating does not allow reduce of dosage in chemical treatment and also does not affect germination, emergence and speed of emergence in high quality seeds stored for until 8months.