No abstract

* RESUMO -Objetivou-se com este trabalho, avaliar a germinação e o desenvolvimento de plantas oriundas de duas cultivares de pessegueiro 'Capdeboscq' e 'Okinawa' sob diferentes períodos de armazenamento, em viveiro comercial da empresa Frutplan Mudas Ltda, em Pelotas -RS, no período de maio a dezembro de 2009. Os caroços das duas cultivares foram armazenados em embalagens de papel por um período de 120 dias, sendo realizados os seguintes procedimentos: 10 dias de temperatura ambiente + 110 dias de frio; 40 dias de temperatura ambiente + 80 dias de frio; 70 dias de temperatura ambiente + 50 dias de frio; 100 dias de temperatura ambiente + 20 dias de frio e 120 dias de temperatura ambiente. Utilizando câmara fria programada para 6 ± 2 °C. O experimento foi conduzido em blocos casualizados, com quatro repetições e 25 sementes por parcela, no arranjo fatorial 2x5 (duas cultivares e cinco períodos de estratificação). As variáveis analisadas foram: porcentagem de plântulas emergidas, altura das plantas, diâmetro do tronco medido a 10 cm do colo, índice de velocidade de emergência em campo (IVEC) e dias para obtenção de 70% de emergência. A emergência da cv. Okinawa foi próximo a zero, com isto não foi considerada para avaliação de plântulas. Para a cv. Capdeboscq verificou-se diferenças significativas apenas para a variável dias para obtenção de 70% de emergência de plântulas, 112 a 123 dias, exceto para o tratamento com maior horas de frio que não atingiu os 70% de emergência. Conclui-se que os períodos de estratificação e frio não se mostraram vantajosos para obtenção de porta-enxertos de pessegueiro destas cultivares nas condições em que foi conduzido o experimento.Palavras-chave: Pessegueiro. Armazenamento. Germinação. ABSTRACT -The objective of this study was to evaluate the germination and development of plants from two cultivars of the peach, 'Capdeboscq' and 'Okinawa', for different periods of storage, at the commercial nursery of the company Frutplan Mudas Ltda., in Pelotas, Rio Grande do Sul, from May to December of 2009. The kernels of both cultivars were stored in paper wrappings for a period of 120 days, with the following procedures being carried out: 10 days at room temperature + 110 days of low temperature, 40 days at room temperature + 80 days of low temperature, 70 days at room temperature + 50 days of low temperature, 100 days at room temperature + 20 days of low temperature, and 120 days at room temperature, using a cold room programmed for 6 ± 2 °C. The experiment was carried out in a randomized block design, with four replications and 25 seeds per plot, in a 5x2 factorial layout (two cultivars and five periods of stratification). The variables analyzed were: the percentage of seedling emergence; plant height; trunk diameter measured at 10 cm from the soil, speed of emergence in the field (SEF) and days taken to reach 70% emergence. The emergence of cv. Okinawa was close to zero and therefore it was not considered when evaluating the seedlings. For the cv. Capdeboscq, significant differences were ...

The objective of this work was to evaluate the rooting of semi-hardwood blueberry minicuttings, from different cultivars and groups, from the Highbush and Rabbiteye groups in the same culture medium. The experiment was carried out in an agricultural greenhouse in a commercial nursery whith semi-hardwood mini-cuttings were used. The work was conducted, with cuttings segmented into mini-cuttings with three gems and an average diameter of 1.5 mm. Subsequently, their bases were immersed, for 10 seconds, in a commercial solution of IBA, in the concentration of 2.000 mg.L-1, with a mixture of coarse-grained sand and commercial substrate in the proportion of 1:1 as a substrate. The Bifactorial experimental design used was in completely randomized blocks, with two groups (highbush and rabbiteye) and six cultivars (Georgiagem, Misty, O'Neal, Bluegem, Powderblue and Woodard), with four replications and ten cuttings per plot. The percentage of rooted cuttings and surviving cuttings, average number of roots and shoots per cuttings, length of the largest root and shoot, were evaluated. It was found that, in general, the rabbiteye group was superior when compared to the highbush group. Blueberry cultivars from the rabbiteye group when propagated by semi-hardwood cuttings, have greater rooting facility than cultivars from the highbush group. The rooting potential between the cultivars in blueberry studied was different, allow the formation of 95% of cuttings rooted in 90 days.