Influência do extrato de Cyperus rotundus L. acerca da germinação e desenvolvimento inicial das hortaliças tuberosas

Abstract

Cyperus rotundus L., also known as “purple nutsedge”, is considered one of the world's worst weeds. Prevent it dispersal from happening is difficult because of their asexual reproduction; their bulbs can release compounds capable of inhibiting the growth of plants of other species. Experiments using the aqueous extract of C. rotundus’s bulb in the initial concentration of 1g.10 mL-1 and dilutions were performed to analyze the germination percentage (G%), mean germination time (TMG), germination rate coefficient (CVG) and the aerial and root growth of tuberous vegetables: beets (Beta vulgaris L.), carrot (Daucus carota L.) e radish (Raphanus sativus L.). The experimental part was divided into two stages: one in July/2014 and other August/2015. It was observed that the aqueous extract not exposed allelopathic effects in relation to G% for the studied vegetables. The extract at concentration 0.05 g.10mL-1 compared with the control showed differences in TMG and CVG to carrot. In aerial and root growth, the extract concentration in 0.5 g.10mL-1 showed an increase compared to the control.