Eficácia de herbicida natural associado a adjuvantes oleosos

Abstract

Weeds pose a significant problem in agriculture, competing for essential resources with cultivated crops, resulting in reduced productivity. Traditional control through chemical herbicides has environmental impacts and leads to weed resistance, prompting the search for more sustainable alternatives such as bioherbicides and natural herbicides. Therefore, this study aimed to evaluate the effectiveness of a natural herbicide (based on acetic acid) combined with natural adjuvants (orange oil and pyroligneous extract) on black oat and canola. Two experiments were conducted, each focusing on one target plant. The experiments took place in a greenhouse, adopting a completely randomized experimental design with four replications. The treatments were composed of a 4 x 2 factorial, with four doses (0, 5, 10, and 15 L ha-1) of the natural herbicide and two adjuvants (orange oil and pyroligneous extract). The evaluated variables included plant height, visual intoxication, aboveground dry mass, and leaf number. The results indicate that the natural herbicide causes damage to black oats, especially at higher doses, with pyroligneous extract making a significant contribution to the damage. Canola shows few effects with increasing doses of the natural herbicide, but pyroligneous extract causes damage to canola