Emergence and initial development of Mimosa caesalpiniifolia Benth. seedlings for different substrates = Emergência e desenvolvimento inicial de plantulas de Mimosa caesalpiniifolia Benth. em fun o de diferentes substratos

The present study assessed the effects of different substrates on the emergence and initial development of Mimosa caesalpiniifolia Benth seedlings. For this purpose an experiment was done in a greenhouse of the Department of Plant Sciences of Universidade Federal Rural do Semi-árido (UFERSA), Mossoró-RN. The statistical design was completely randomized (CRD), where treatments were composed of nine substrates (T1: vermiculite, T2: coconut fiber, T3: trade hortimix , T4: vermiculite, coconut fiber and compost (1: 1:1), T5: coconut fiber and compost (1:1), T6: coconut fiber and compost (1:2),T7: vermiculite and compost (1:1), T8, vermiculite and compost organic (1:2) and T9: organic compost). All treatments were represented by four replications containing 25 seeds. The following variables were evaluated: emergency percentage, emergence rate index, length of shoot and root, stem diameter, dry leaves, stem, root and total leaf area, specific leaf area, leaf area ratio, and leaf weight ratio. Data were submitted to the Tukey test at 5% probability. The coconut fiber substrates, commercial hortimix and vermiculite proved superior promoted good emergence and early development of seedlings. The mixture of vermiculite, coconut fiber and compost (1:1:1), coconut fiber and compost (1:1), coconut fiber and compost (1:2) and organic compost and vermiculite (1: 1) was not shown to be adequate for the cultivation of seedlings. There was no emergency in the pure organic compound in the mixture of compost and vermiculite (1:2).Key words - Vermiculite. Organic compost. Coconut fiber. Sabiá. Substrates. = Objetivou-se com o presente trabalho avaliar o efeito de diferentes substratos na emergência e desenvolvimento inicial de plantulas de sabiá (Mimosa caesalpiniifolia Benth.). Para isso, foi instalado um experimento em casa de vegeta o do Departamento de Ciências Vegetais da Universidade Federal Rural do Semi-árido (UFERSA), Mossoró-RN. O delineamento estatístico utilizado foi inteiramente casualizado (DIC) e os tratamentos foram compostos por nove substratos (T1: vermiculita; T2: fibra de coco; T3: comercial hortimix ; T4: vermiculita, fibra de coco e composto organico (1:1:1); T5: fibra de coco e composto organico (1:1); T6: fibra de coco e composto organico (1:2); T7: vermiculita e composto organico (1:1); T8:vermiculita e composto organico (1:2) e T9: composto organico), com quatro repeti es de 25 sementes. As variáveis avaliadas foram: porcentagem de emergência; índice de velocidade de emergência; comprimento de parte aérea e de raiz; diametro do colo; matéria seca