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Master's Dissertation
DOI
https://doi.org/10.11606/D.11.1980.tde-20220207-220906
Document
Author
Full name
José Carlos de Oliveira
Institute/School/College
Knowledge Area
Date of Defense
Published
Piracicaba, 1980
Supervisor
Title in Portuguese
Métodos para obtenção de amostras de trabalho de sementes de azevém anual (Lolium multiflorum Lam.) e de paspalum (Paspalum notatum Flugge)
Keywords in Portuguese
AMOSTRAS
AZEVÉM
GRAMA-BATATAIS
SEMENTES
Abstract in Portuguese
Baseando-se no fato de que a variação no comportamento dos divisores de amostra, é uma das causas da desuniformidade entre os resultados obtidos por diferentes laboratórios e/ou analistas, o presente trabalho, conduzido no Laboratório de Sementes do Departamento de Agricultura e Horticultura da Escola Superior de Agricultura Luiz de Queiroz, da Universidade de São Paulo, teve por objetivo comparar diferentes métodos de divisão e tentar estabelecer o mais adequado para a obtenção de amostras de trabalho de sementes de azevém anual (Lolium multiflorum Lam.) e de paspalum (Paspalum notatum Flugge). Para tanto, compararam-se os desempenhos dos divisores Boerner, de Solo (modelos grande e pequeno) e o Gamet. Neste divisor foram testadas duas técnicas de manuseio, dirigindo-se a queda das amostras para as posições frontal e central da moega do aparelho. Utilizaram-se, para cada espécie, quatro lotes de sementes que diferiam, principalmente, quanto à pureza física. Para cada amostra de trabalho obtida, foram efetuadas as seguintes determinações: análise de pureza física, teste de germinação, valor cultural e primeira contagem de germinação. A eficiência de cada método de divisão foi avaliada através dos cálculos das variâncias, coeficientes de variação e intervalos de confiança. A análise dos dados e a interpretação dos resultados obtidos, permitiram as seguintes conclusões: 1.1 - A obtenção de amostras de trabalho com uniformidade razoável, em lotes de sementes palhentas, depende do método utilizado para a homogeneização e divisão. 1.2 - Dentre os divisores testados, o tipo Boerner e o de Solo apresentaram desempenhos mais uniformes para a obtenção de amostras de trabalho de sementes de azevém e de paspalum. 1.3 - O comportamento do divisor Gamet não foi alterado pelas duas formas de direcionamento da queda das amostras em sua moega. 1.4 - Os métodos de divisão mostraram-se mais eficientes à medida que melhorou a qualidade do lote analisado.
Title in English
Methods for obtaining working samples of annual ryegrass (Lolium multiflorum Lam.) and bahiagrass (Paspalum notatum Flugge) seeds
Abstract in English
The variation on the performance of seed sample dividers is one of the factors affecting the uniformity of the results obtained by different laboratories and/or seed analysts. Due to this fact, a research was carried out to compare different dividing methods so as to select the most suitable to obtain working samples of annual ryegrass (Lolium multiflorum Lam.) and Ipeame bahiagrass (Paspalum notatum Flugge) seeds. The experiment was set at the Seed Laboratory of the Department of Agriculture of Escola Superior de Agricultura Luiz de Queiroz, University of São Paulo, in Piracicaba, State of São Paulo, Brasil. The performances of the following dividers were compared: Boerner, Soil and Gamet. Two techniques of handling were tested for the Gamet divider: pouring the sample frontally over the hopper and centrally over the hopper. Four lots of seeds of each specie, differing mainly as to physical purity, were used. The following determinations were made for each working sample obtained: purity analysis, germination, pure live seeds and germination first count. The efficiency of each dividing method was evaluated by calculating variances, coefficients of variation, and confidence intervals. According to data analysis and the interpretation of the results, the following conclusions were obtained: 8.1 - The attainment of reasonable uniformity of working samples, from lots of chaffy seeds, depends on the method employed for sample homogenization and division. 8.2 - The Boerner and the Soil dividers showed the most uniform performance in the attainment of working samples of annual ryegrass and bahiagrass seeds. 8.3 - The performance of the Gamet was not influenced by the two forms of pouring the sample over its hopper. 8.4 - The methods of division were more efficient as the quality of analyzed lot improved.
 
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Publishing Date
2022-02-07
 
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