02235naa a2200277 a 450000100080000000500110000800800410001910000210006024500980008126000090017950001430018852013070033165000170163865000170165565000340167265300250170665300250173165300120175665300110176870000200177970000190179970000180181870000150183670000150185177300910186611083192018-11-13       2002    bl uuuu     u00u1 u    #d1 aCRAVIOTTO, R. M.  aDescription of a pure seed fraction of oat through usual evaluations and radiographic images.  c2002  aTítulo em português: Descrição de uma fração pura de sementes de aveia por meio de avaliações usuais e por imagens radiográficas.  aThe objective of this work was to evaluate the width and length incidence in a single seed fraction of oat [Avena sativa (L.)] cv. Cristal. The seeds were selected by a mechanical divider and by hand, and their correspondence to radiographic images in seeds with glumes and their caryopses. The width and length of the seeds with glumes and their caryopses were measured with electronic calliper, and their weight, with precision balance. Radiographic images of seeds with glumes were taken with an X-ray experimental equipment. The analyst selected seeds with glumes by the width and by the length previously determined and so with more weight, than that obtained by hand selection was slightly narrower, larger and lighter. The presence of the glumes masked the caryopses real dimensions (width and length), and conduced the analyst to select seeds that differed more by the width than by the length. The radiographic images showed the presence, or not, of caryopses inside the seed and its real dimensions. The mechanical partition method for seeds showed to be more efficient because the analyst subjectivity was not considered when the selection upon its dimensions was done. The X-ray analysis was a useful tool that complements the pure seed fraction selection as another factor of seed quality.  aseed quality  aAvena Sativa  aCaracterísticas Agronômicas  aagronomic characters  aqualidade da semente  araios X  aX-rays1 aYOLDJIAN, A. M.1 aSALINAS, A. R.1 aARANGO, M. R.1 aBISARO, V.1 aMATURO, H.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 37, n. 8, p. 1183-1188, ago. 2002