Peliculização e tratamento químico de sementes de algodoeiro (Gossypium hirsutum L.)

Abstract

Physiological and healthy quality of cotton seeds (Gossypium hirsutum L.) are decisive factor to establish an ideal stand in the field. The chemical seed treatment is necessary to preserve the healthy quality and to obtain a better development performance of the seeds in the field. Actually, researches on chemical treatment are liberally conducted, which film–coating technique has been used to get better adherence of these chemical products on the seeds. In this study, the physiological and healthy quality of two seed lots of Delta Opal and two seeds lots of Sure Grow, chemically treated and covered with 2 types of commercial films, AG201 and TGBP1080, were evaluated. The cotton 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. In both treatments, with 2ml/Kg of the films were added. The treatments were evaluated by germination test, emergence test, speed of emergence, cold test and seed healthy test. The treatment of 5ml/Kg of the fungicides (carboxin + thiran and insecticide (imidaclopride) was efficient in controlling fungus on the seeds. The film–coating does not allow to reduce the dosage in chemical treatment of seeds and also does not affect the germination, the emergence and the speed of emergence in high quality seeds.