Interações alelopáticas de culturas de inverno sobre soja

Abstract

In the southern region of Brazil, wheat (Triticuma estivum), black oats (Avena strigosa) and canola (Brassica napus) are croped in winter period aiming soil cover and grain production. However, there is no information about possible allelopathic interactions of these crops over soybeans in the Missões region, Rio Grande do Sul state, Brazil. So, the objective of this work was to evaluate the allelopathic potential of aqueous extracts of wheat, black oats and canola and its influence on soybean germination. The aqueous extracts were obtained by mixing 1g, 5 g and 10 g of the dry and ground matter of the plants with 99 ml, 95 ml and 90 ml of distilled water, respectively. There was also a control with only distilled water. The experiment was conducted in a completely randomized design with four replications. The results obtained allow us to conclude that the aqueous extracts of oats, canola and wheat had significant interference on germination, germination rate and radicle size. Black oats and canola showed more notable results than wheat in relation to the germination and vigor parameters of soybean. The allelopathic interactions vary according to the extract concentration.