Influence of Foliar Antibroadleaved Herbicides on Cotton Seed Germination (Gossypium hirsutum L.)

Abstract

The trial was carried during period 2013-2015 with twelve Bulgarian cotton cultivars - Chirpan-539, Helius, Trakia, Viki, Filipopolis, IPK-Veno, Boyana, Avangard, Natalia, Darmy Dorina and Nelina (Gossypium hirsutum L.). Herbicides Bazagran 480 SL (bentazone), Pulsar 40 (imazamox) and Express 50 SX (tribenuronmethyl), applied during budding stage of cotton, were investigated. For the first time in the world, cotton cultivars resistant to herbicides Basagran 480 SL, Pulsar 40 and Express 50 SX were identified. Herbicide Bazagran 480 SL had the highest phytotoxicity on seed germination in cultivars Chirpan-539. Herbicide Pulsar 40 had the highest phytotoxicity on seed germination in cultivar Filipopolis. Herbicide Express 50 SX had the highest phytotoxicity on seed germination in cultivar Chirpan-539. From the viewpoint of technology for cotton growing, in terms of its impact on germination of cotton seeds, technologically the most suitable to foliar treatment with herbicide Bazagran 480 SL are cultivars Helius, Trakia, Viki, Filipopolis, IPK-Veno, Boyana, Avangard, Natalia, Darmy Dorina and Nelina. For the first time in the world we established that in the vegetative treatment with herbicides, technologically the most suitable to foliar treatment with herbicide Pulsar 40 are cultivars Helius, Trakia, IPK-Veno, Boyana. Technologically the most suitable to foliar treatment with herbicide Express 50 SX are cultivars Filipopolis, IPK-Veno, Avangard, Natalia and Dorina. These variants combine high levels of the seed germination and high stability of this index during the years.