Published in Scientific Papers. Series A. Agronomy, Vol. LXVIII, Issue 2
Written by Teodora BARAKOVA
The after effect of the herbicide Envoke on the root weight and the sprout weight of cotton seeds was studied in two cultivars - Chirpan-539 and Helius (Gossypium hirsutum L.). The herbicide was applied during the crop's vegetation, once during the 4-5 leaf stage and twice during the 4-5 leaf and budding stages of the cotton. It was tested at the doses - 10 g.ha-1, 15 g.ha-1and 20 g.ha-1. Seed germination samples taken from cotton plants treated with the herbicide Envoke during the growing season were placed. The root weight and the sprout weight were recorded on the 7th day after the samples were planted. The results obtained from each herbicide variant were compared with those of the two controls - the untreated control and the economic control. The herbicide Envoke, applied during the growing season of the two cotton cultivars - Chirpan-539 and Helius, did not have aftereffect the root weight of the cotton seeds. The herbicide had not negative affect on the sprout weight of the cultivar Helius, but did effect on this indicator of the cultivar Chirpan-539.
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