Potencial alelopático de espécies de inverno na germinação de corda-de-viola (ipomoea indivisa)

Abstract

Morning glory (Ipomoea indivisa) is a weed widely distributed in agricultural regions of Brazil, with high competitive capacity in both annual and perennial crops. In this context, winter cover crops with allelopathic potential, such as black oat (Avena strigosa), forage radish (Raphanus sativus), common vetch (Vicia sativa), ryegrass (Lolium multiflorum), and rye (Secale cereale), emerge as sustainable alternatives for the control of this weed species. This study aimed to evaluate the effects of different concentrations (0, 25, 50, 75, and 100%) of aqueous allelopathic extracts obtained from winter cover crops on the initial development of morning glory (Ipomoea indivisa). The variables evaluated were the germination percentage and the root system length of the seedlings. The experiments were conducted in a germination chamber (BOD) at the Laboratory of Sustainable Management of Agricultural Systems, Federal University of the Southern Frontier (UFFS), Erechim campus, in a completely randomized design with four replications. The results showed that the 75% and 100% concentrations were the most effective in inhibiting germination and root elongation of morning glory. The variable “plant species” and the plant*concentration interaction did not show statistical significance, indicating that the inhibitory effect is more closely related to extract concentration than to the species used. It is concluded that plant extracts from cover crops, especially at higher doses, represent a promising strategy for the biological and sustainable management of Ipomoea indivisa.