Teresa Aparecida Soares de Freitas

Influência da posição das miniestacas na qualidade de mudas de cedro australiano e no seu desempenho inicial no pós-plantio

The Toona ciliata (Australian cedar), originated from Australia showed high acclimatization in Brazil, where it found appropriate conditions for its growth, particularly in southern Bahia and throughout the southeastern region. However, the plantings presented irregular stems. Besides the seeds are a limiting resource, in result of their production seasonality and short viability period. This study aimed the evaluation of the quality of cuttings grown from 6 cm length apical, middle and basal mini-cutting positions of the sprouts of the mini-strains - from seminal origin - and the initial growth of cuttings. It was established a multi-clone mini-garden containing a total of 284 mini-strains. After cutting off the sprouts of the seedlings - to originate the mini-strains - the mini-cuttings from the above different positions were collected. At the lifting time of the rooting sector, dry mass weight of shoot and root, length, diameter, number of adventitious roots and survival data were collected. The height and diameter were monitored fortnightly, starting from 80 days after the staking of the mini-cuttings. At the end of the production cycle, the dry mass weight of shoot, the root number, the diameter and the length of root cuttings were evaluated. Thirty percent of the cuttings were transplanted to pots of 3.8 L, in the open air where the height and basal diameter, the dry mass of shoot, the leaves and the roots were measured 60 days after the transplanting. Cuttings originated from the basal mini-cuttings at the end of the lifting time of the rooting sector, showed the highest height and diameter, however no difference was pointed out regarding to the basal diameter of cuttings originated from the middle position. There were no differences related to the shoot dry mass and the adventitious root number, the dry mass weight, the total length and the diameter of the adventitious roots of cuttings in relation to the mini-cutting positions in the sprouts. The survival was high, averaging 94.7 % for the apical, 96.3 % for the middle and 96.6 for basal position. Sixty days after transplanting, despite the differences in the diameter and the height of the cuttings at the end of the nursery phase, no difference in the height, the diameter and the dry mass weight of shoots, the leaves and the roots as pointed out in the treatments.

Outplanting performace of eucalyptus clonal cuttings produced in different containers and substrates

The objective of this work was to evaluate the outplanting growth of Eucalyptus grandis e E. saligna clones, produced by cuttings in tubes (50cm 3 ) and in pressed blocks (40x60x07cm) - 175 cm 3 / seedlings, with different substrates (BT - sugarcane bagasse+sugarcane filter cake; AR - carbonized rice hull + eucalyptus bark; TF - peat). The experiment was arranged in a randomized block design, in a 2x7 factorial (2 clones and 7 treatments), with four replicates with 25 plants. Survival was evaluated two months later . Plant growth was monitored through height and ground level diameter at 20, 40, 60, 120 and 180 days after outplanting. To evaluate the effect of the containers on stem and root biomass in both clones, 180 days after outplanting, the cuttings grown in BT substrate with fertilizer were selected. One plant per plot of each clone, grown in tubes and in pressed blocks was selected. The E. grandis and E. saligna cuttings grown in pressed blocks with sugarcane bagasse+sugarcane filter cake presented greater height and diameter after out planting. Both clones presented larger root, bark, log and branch biomass production in plants produced in the block system. Cuttings of E. saligna grown in pressed blocks showed 80% most wood biomass 180 days after outplanting, compared to that grown in tubes. In E. grandis, the differences in diameter and height, in function of the cutting production system, decreased along time, while in E. saligna these differences increased along the evaluation period.

Performance of tamboril Seedlings Produced in Three Different Tube Volumes

The objective of this study was to evaluate the performance of tamboril (Enterolobium contortisiliquum (Vell.) Morong) seedlings and define their time in the nursery. Two experiments were carried out; in the first, the seedlings remained in the nursery for 120 days, and height, diameter, root deformation %, shoot dry mass, root system and leaf number were evaluated. In the second experiment, four seedlings of each repetition were transplanted into 35 x 40 cm bags and then assessed for height, diameter and dry weight of the shoot and root system. Data were submitted to analysis of variance (α = 0.05), Tukey test at 5% (qualitative factor) and sequential regression (quantitative factors). The seedlings produced in higher-tube volumes achieved conditions for planting at 90 days, while those produced in the lowest volume achieved the same conditions only after 120 days. Therefore, 180 cm3 tubes and a 90-day stay in the nursery are recommended.

Tamanho de amostra para teste de germinação de Mimosa caesalpiniifolia Benth, espécie nativa da Caatinga

O objetivo desse trabalho e definir o tamanho da amostra para teste de germinacao de Mimosa caesalpiniifolia Benth. O experimento foi realizado em delineamento experimental inteiramente casualizado em esquema fatorial 6 x 8, seis numeros de sementes (20; 25; 30; 50; 70 e 100) e oito numeros de repeticoes (3; 4; 5; 6; 7; 8; 9 e 10), com cinco repeticoes. Foram utilizados 20 repeticoes para cada numero de sementes, das quais se realizaram sorteios para obtencao das repeticoes de cada tratamento. O teste de germinacao foi realizado em germinador, tipo BOD, a 30 °C com fotoperiodo 12 h, em papel germitest. As caracteristicas avaliadas foram: indice de variacao para percentagem de germinacao e para velocidade de germinacao. O numero de sementes que resultou em menor indice de variacao, para os numeros de repeticoes seis, sete, oito e dez, variou de 65 a 79 sementes por repeticao. Para tres e cinco repeticoes constatou-se tendencia de reducao do indice de variacao para percentagem de germinacao com o aumento do numero de sementes por repeticao, justificando utilizar para testes de germinacao no minimo seis repeticoes. Para o indice de velocidade de germinacao nao se constatou efeito do numero de repeticao sobre o indice de variacao, enquanto que o numero de sementes que resultou em menor indice de variacao, independente do numero de repeticoes, foi 75 sementes. Para o lote de sementes avaliado, recomendam-se utilizacao de seis repeticoes com numero de sementes por repeticao variando de 65 a 79 sementes.