Influences of size os soybean seed in the physiological quality

A soja (Glycine max L. Merril) atualmente, no Brasil, ?? a esp??cie com maior extens??o de cultivo, tendo relevante import??ncia econ??mica no pa??s. Assim, torna-se fundamental o conhecimento de todos os fatores que envolvem o processo germinativo da semente de soja, visando maior sucesso econ??mico desde a semeadura. O uso de procedimentos eficientes para avalia????o da qualidade fisiol??gica ?? fundamental em programas de controle de qualidade. O presente trabalho teve por objetivo avaliar a qualidade fisiol??gica de sementes de soja classificadas em diferentes tamanhos, a distribui????o de sementes quanto ao tamanho e o peso de mil sementes. Para avalia????o da qualidade foram realizados os testes de germina????o, envelhecimento acelerado e emerg??ncia de plantas no campo. A pesquisa foi conduzida no munic??pio de Cascavel, Paran?? nos anos de 2004/2005 na Coopavel Cooperativa Agroindustrial com sementes de soja das cultivares CD 202 e CD 215, classificadas em quatro tamanhos de sementes (5,5; 6,0; 6,5; e 7,0 mm). O delineamento experimental utilizado foi o de blocos inteiramente casualizado. N??o observou-se efeito do tamanho de sementes sobre a qualidade fisiol??gica das sementes nos dois cultivares. Os lotes do cultivar CD 215 apresentaram qualidade fisiol??gica superior aos lotes do cultivar CD 202.The soybean (Glycine max L. Merril) nowadays, in Brazil, is the species with biggest extension of cultivation and with a relevant economic importance in the country. So, it becomes fundamental to know all of factors that involve the germinative process of soybean seed, aiming a higher economic success since the sowing. The use of efficient procedures to evaluate the physiologic quality is fundamental in control programs of quality. The present work had the objective of evaluate the physiological quality of soybean seeds, classified in different sizes, the distribuition of seeds about the size and wheight of a thousand of seeds. To evaluate the quality, germination tests, accelerated aging tests and emergency test of plants in the field was realized. The search was realized in Cascavel, Paran?? State in the 2004/2005 years at Coopavel Cooperativa Agroindustrial with soybean seeds from CD 202 e CD 215 cultivars, classified in four sizes of seeds (5,5; 6,0; 6,5 and 7,0mm). The experimental lineation used was the blocks entire casualized. It was not observed the effect of the sizes of seeds in the physiological quality of seeds in the two cultivars. The parcel of CD 215 cultivar presented superior physiological quality than the cultivar parcels of CD 202