Efeito alelopático do capim pé de galinha (Eleusine indica) sobre o desenvolvimento inicial da soja e feijão

Abstract

Weeds cause significant losses to farmers, reducing crop productivity and increasing management costs. Goosegrass (Eleusine indica) competes intensely with crops for resources and can significantly reduce agricultural yields. In addition to competition, the allelopathy generated by this species is still little studied but may interfere with crop development. Allelopathic substances are released into the environment through volatilization, leaching, and decomposition of plant residues. This study evaluated the allelopathic effects of goosegrass on the emergence and early development of soybean and common bean. The experiment was conducted in a greenhouse during the first semester of 2025 at the Federal University of Technology – Paraná (UTFPR), Dois Vizinhos Campus. A completely randomized design was used, with four replications and five treatments: irrigation with leachate from dead plants (T1), whole live plants (T2), root system (T3), aerial parts (T4), and a control irrigated with water (T5). For soybean, significant differences were observed in plant height at 20 days after emergence (DAE), stem diameter at 27 DAE, and shoot dry matter. The other variables did not show significant differences. For common bean, no statistical differences were observed for any of the variables analyzed. Despite the average variations observed among treatments, it is concluded that under the evaluated conditions, goosegrass did not present deleterious allelopathic effects on the initial development of soybean and common bean.