Efeito do extrato de urtiga na germinação e desenvolvimento de plântulas de alface

Abstract

Horticulture in Brazil is an activity of great social, economic, industrial and food importance. There is a great demand for vegetables in the diet as they are able to meet some of the daily needs of the human body. Therefore, it is extremely important to obtain healthy plants with good vegetative development, and for that, quality seeds and seedlings are needed. Therefore, this work aims to evaluate the effects of different doses of Urtica urens L. extract on seed germination and development of lettuce seedlings. The present work was carried out at the Seeds and Grains Laboratory, at the Federal University of Fronteira Sul, Chapecó/SC campus, in a completely randomized design, in a 2 x 4 factorial scheme (cultivars and doses); the doses used were 0%, 25%, 50% and 100% of aqueous extract of Urtica urens L., with five repetitions. Lettuce seeds from cultivars Grandes Lagos 659 and Itapuã Super were used. The variables analyzed were: germination, first germination count, shoot length (CPA) and seedling roots (CR) and seedling shoot green mass. The data obtained were subjected to analysis of variance and comparison of means for the cultivar factor and regression for the extract concentration factor. Effects of nettle extract doses on variables of first count, germination, shoot and root length and shoot green mass were observed, according to the analyzed cultivars. Therefore, it is concluded that the nettle extract has positive effects on the germination of lettuce seeds of the cultivar Grandes Lagos and Itapuã Super, it also allowed greater aerial part length in the cultivar Itapuã Super and the greater green mass of the aerial part in the two cultivars analyzed.