SUBSTRATES AND LEVELS OF LIGHT INTENSITY ON INITIAL GROWTH OF SEEDLINGS OF Tocoyena formosa (Cham. & Schltdl.) K. Schum. (RUBIACEAE)

Abstract

Objetivou-se determinar o tipo de substrato e as melhores condi\ue7\uf5es de luminosidade para o cultivo de mudas de Tocoyena formosa (Cham. & Schltdl.) K. Schum. A semeadura ocorreu em bandejas de isopor sob sombrite de 70% e tr\ueas meses ap\uf3s a emerg\ueancia, as pl\ue2ntulas foram selecionadas e em seguida transplantadas em vasos de 4L, em dois tipos de substratos: 50% de solo Latossolo Vermelho Distrof\ue9rrico + 50% de areia (TA) e 50% de solo de Latossolo Vermelho Distrof\ue9rrico + 25% de areia + 25% de cama de frango semidecomposta (TACF). Ap\uf3s o transplante, as mudas foram levadas para tr\ueas condi\ue7\uf5es de sombreamento (30%, 50% e 70% de sombra) e a pleno sol (0%). Apo\u301s a aclimatac\u327a\u303o, a qualidade siolo\u301gica das mudas foi determinada mensalmente, atrave\u301s da ana\u301lise de crescimento e do i\u301ndice de qualidade de Dickson, durante 90 dias. O experimento foi realizado em DIC em esquema fatorial 2 x 4 x 4 (substratos x sombreamento x idade da muda), com tr\ueas repeti\ue7\uf5es de tr\ueas mudas. Foi observado maior crescimento e qualidade das mudas em substrato terra + areia + cama de frango e nas condi\ue7\uf5es de 30% de sombra e pleno sol. Conclui-se que para produ\ue7\ue3o de mudas de Tocoyena formosa a melhor condi\ue7\ue3o de luminosidade \ue9 30% de sombra e em pleno sol em substrato TACF.The aim of this study was to determine the best substrate type and light conditions for the cultivation of seedlings of Tocoyena formosa (Cham. & Schltdl.) K. Schum. Seeds were planted in Styrofoam trays under 70% shading. Three months after emergence, the seedlings were selected and transplanted in 4-L pots, in two types of substrates: 50% dystroferric Red Latosol + 50% sand (TA) and 50% dystroferric Red Latosol + 25% sand + 25% semi-decomposed chicken manure (TACF). After transplanting, the seedlings were placed under three conditions of shading (30, 50 and 70% shade) and full sun (0% shade). After acclimation, the physiologic quality of the seedlings was determined monthly, by analysis of growth and Dickson quality index, for 90 days. The experiment was carried out using a randomized block design in a 2 x 4 x 4 factorial scheme (substrate x shading x age of seedling), with three repetitions of three seedlings. There was greater growth and quality of the seedlings in the substrate soil + sand + chicken manure and under conditions of 30% shade and full sun. It is concluded that for the production of seedlings of Tocoyena formosa, the best conditions are 30% shade and full sun for light and TACF for substrate