Published in Scientific Papers. Series A. Agronomy, Vol. LXVII, Issue 1
Written by Teodora BARAKOVA
The research was conducted during the period 2021-2023 on the testing grounds of the Field Crops Institute in Chirpan with cotton cultivar Helius (Gossypium hirsutum L.). In a two-factor field experiment, the effect of two vegetation-applied herbicides: "Staple", containing 33.6% pyrithiobac-sodium, and "Envoke", containing 75% trifloxysulforon-sodium. Factor A included the herbicides "Staple" and "Envoke", applied once and twice during the phenophases of 4-5 leaf and bud development of cotton. Factor B included the three years of study. The highest yields of cotton were obtained with the herbicide combination "Staple" + "Envoke", applied once and twice during the phenological stages of 4-5 leaf and budding of cotton. The vegetation herbicides "Staple" and "Envoke", when applied once and twice during the phenophases of 4-5 leaf and bud development of cotton, did not affect the percentage of boll opening and the boll weight of the cotton cultivar Helius.
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