Propagação de carqueja por estaquia e determinação do tamanho de amostra para caracteres agronômicos

• Ano de defesa: 2016
• Autor(a) principal: Schöffel, André
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Santa Maria; Brasil; Agronomia; UFSM; Programa de Pós-Graduação em Agronomia; Centro de Ciências Rurais
• Palavras-chave em Português: Baccharis articulata (Lam.) Pers; Produção de mudas; Precisão experimental; Dimensionamento amostral; Seedling production; Experimental accuracy; Sample dimension; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://repositorio.ufsm.br/handle/1/21320

The cultivation of medicinal plants is expanding and is emerging as an alternative for diversification of activities in the national agricultural production system, especially in family farms. The improvement of farm techniques is required for native medicinal plants which suffer the high rates of extraction and reduction of phytochemical quality, such as the case of carqueja (Baccharis articulata (Lam.) Pers.). This study aimed to evaluate the propagation of the carqueja through different cutting sizes in polystyrene trays with 72 and 128 cells (Article 1); and determine the sample size to estimate the average agronomic characters in carqueja seedlings planted in polystyrene trays of 72 and 128 cells (Article 2). For the two articles, the planting was carried out in greenhouse from February (first season) to August (second season). In Article 1, the experimental design was of completely randomized, in a factorial scheme (4x2), with 4 cutting sizes (5, 10, 15 and 20 cm) and 2 types of tray (72 and 128 cells). The following characters were measured: plant height, number of shoots, number of roots, root length, shoot dry weight, dry weight of roots and percentage of rooted plants, plants sprouted and the surviving plants. In Article 2, the descriptive statistics was calculated and the size of the sample, in number of plants, was determined by resampling, with 2,000 resampling with replacement, with three precision levels for the amplitudes of the 95% confidence interval (AIC95%) of 10% (higher accuracy), 15% and 20% (less accuracy) of the estimated mean. In two seasons of planting, the sample size was determined for plant height and number of shoots and in the second planting time for shoot dry weight, dry weight of roots, total dry weight and number of roots. The production of seedlings in trays of 72 cells showed higher percentage of rooted plants in February, more number of shoots and percentage of sprouted plants in August and length of the upper roots in two planting dates; seedlings with stakes of 20 cm showed higher plant height, number of shoots, percentage of sprouted plants, dry weight of shoot and root dry matter. Planting in August proved to be suitable for the production of carqueja seedlings. The sample size, and the number of plants, depend on the character, the evaluation date, the stake size, the planting season and on the type of tray used for propagation; in order to estimate the average number of shoots, the dry root mass and the number of roots, in the three precision levels, a higher sample size was necessary; for (AIC95%) equal to 20% of the average estimate, the sample size ranged from 2 to 127 plants, for all evaluation dates, characters, precision levels, cutting sizes, types of trays and planting dates.