The Eucalyptus grandis seedlings, presented quality when grown on organic substrates. Organic compound mixed with carbonized and hydrolyzed rice husk and crushed peach kernel. Carbonated rice husk (30%), hydrolyzed rice husk (20%) and crushed peach kernel (10%). These component can be used to improve the physical characteristics of the substrates.

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RESUMOO presente trabalho teve como objetivo avaliar diferentes substratos na germinação de sementes e emergência de plântulas de Luehea divaricata. O estudo foi realizado no Viveiro Florestal, DCFL, Universidade Federal de Santa Maria -RS. Os frutos foram coletados de oito árvores matrizes, no Morro do Cerrito, Santa Maria, em julho de 2010. Após o beneficiamento, as sementes permaneceram armazenadas em câmara fria, dentro de sacos de papel, por 4 meses, para o estudo de emergência de plântulas, e por 7 meses para a avaliação da germinação de sementes. Foram avaliados cinco substratos para germinação (T1: Rolo de papel; T2: Sobre papel mata-borrão; T3: Entre papel mata-borrão; T4: Sobre areia; T5: Sobre vermiculita) com quatro repetições, e quatro tratamentos para emergência (T1: 100% turfa; T2: 80% turfa e 20% casca de arroz carbonizada; T3: 60% turfa e 40% casca de arroz carbonizada; T4: 40% turfa e 60% casca de arroz carbonizada) com cinco repetições. Foi utilizado delineamento experimental inteiramente casualizado. Foram analisadas as variáveis germinação (G), índice de velocidade de germinação (IVG) e tempo médio de germinação (TMG) em laboratório e, para emergência, foi analisado o percentual de emergência (E), índice de velocidade de emergência (IVE) e tempo médio de emergência (TME) em viveiro. O início da germinação ocorreu no 6° dia, podendo a primeira contagem ser realizada aos 18 dias e as avaliações serem encerradas aos 35 dias após a instalação do experimento. Além disso, o substrato sobre vermiculita (T5) apresentou os percentuais mais altos de G e IVG, correspondendo a 42% e 0,678, respectivamente, enquanto que o T2 apresentou o menor TMG (14,80 dias). A emergência de plântulas teve início aos 21 dias após a semeadura, sendo finalizada aos 70 dias. Os tratamentos T1 e T2 apresentaram os maiores valores de E, 84,37%, 91,87%, respectivamente, diferindo estatisticamente de T3 e T4. Além disso, o tratamento T2 também apresentou os melhores valores de IVE (0,98) e TME (33,54 dias). Portanto, para germinação de sementes é indicado o substrato sobre vermiculita, e para emergência de plântulas, os substratos 100% turfa e a mistura de 80% turfa e 20% casca de arroz carbonizada. Palavras-chave: açoita-cavalo; espécie nativa; sementes florestais; viveiro florestal. ABSTRACTThis study aimed to evaluate different substrates on seed germination and seedling emergence of Luehea divaricata. The study was conducted at the Viveiro Florestal, DCFL, Universidade Federal de Santa Maria, RS. The fruits were collected from eight mother trees in the Morro Cerrito, Santa Maria, in July 2010. After processing, the seeds were stored in cold storage in paper bags for 4 months for the study of emergence,

Eugenia involucrata DC. (Myrtaceae) stands out by its ecological potential, and it is indicated in), were evaluated with four repetitions, using completely randomized design. The emergence variables, the emergence speed index and average time of emergence were analyzed, besides the height, stem diameter and relation height/diameter of the stem. The seedlings emergence had the beginning at 77 days after sowing, and it was established at 126 days. For production of seedlings indicated the use of container of 180 cm 3 , allied to the dose of 12 g L -1 of CRF. Nevertheless, considering the long time necessary to the emergence and the slow species growth, the topdressing will be necessary since this fertilizer presents determined time of efficiency.

Myrocarpus frondosus is a native species with high commercial timber value. Thus, the objective of this research was to evaluate the quality of seedlings of Myrocarpus frondosus in the nursery and to indicate the most adequate substrate and fertilization for the production of seedlings. The experiment was conducted in a completely randomized design, with four replications, in a factorial scheme, composed of four combinations of substrates: S1-100% commercial substrate (CS); S2 - 80% CS and 20% carbonated rice husk (CRH); S3 - 60% CS and 40% CRH; S4 - 40% CS and 60% CRH, and four fertilizations: NF – No fertilization; CRF – controlled release fertilizer (ammonium sulfate, simple superphosphate and potassium chloride); RRF – ready release fertilizer and micronutrients. Physical and chemical analyses were performed on the substrate. At 300 days after emergence, the following morphological variables were evaluated: (height, stem diameter, H/SD ratio, leaf area, root length, aerial dry mass, root dry mass, total dry mass, Dickson quality index) and the physiological variables chlorophyll a, chlorophyll b, carotenoids, initial fluorescence, maximum fluorescence, Fv/Fm ratio and electron transport rate). Regardless of the substrate and fertilization, slow growth of the species was observed, even for the best treatment, which was verified from the height (17.87 cm) and stem diameter (2.62 mm). The use of the commercial substrate (40%) with carbonated rice husk (60%) associated with the concentration of 6 g L-1 of controlled release fertilizer is recommended, since they present the best results for the morphological and physiological variables in the nursery in general.