Efeito alelopático de extratos aquosos de cebolinha na germinação da alface

Abstract

Chives can be grown single or intercropped. In intercropping crops, some interactions between plants are considered, which may be beneficial or harmful. Such interactions are caused by some plants that can produce so-called allelopathic compounds. In view of this, this research aimed to evaluate a possible allelopathic effect caused by chives. For this, bioassays of crude extracts of chives were carried out on the germination and development of lettuce seedlings. The experiment was carried out in the Seed Laboratory of the Federal University of Ceará, and was conducted in a completely randomized design, in a 3 x 5 factorial scheme, that is, three types of aqueous extracts composed of parts of chives (1- , 2-Root (R) and 3-Total Plant (PT)) and five concentrations of each of these aqueous extracts (0, 25, 50, 75 and 100%). Each treatment consisted of four replicates of 50 seeds. Physicochemical analyzes of the extracts were carried out by means of determination of pH, electrical conductivity and osmotic potential. Germination tests on lettuce seeds were carried out in gerbox boxes with substrate germitest paper and for analysis of lettuce development the following variables were evaluated: germination, first germination count, germination speed index, germination average time, aerial part length, root length and dry mass of seedlings. The physical-chemical variables of the extracts, which were analyzed, are within the range that does not interfere in the identification of the presence of allelopathic compounds. The extracts of chives obtained from the use of the root system caused a negative effect on the lettuce, thus being verified the allelopathic potential of the chives on the lettuce.