Radioterapia e Termoterapia como tratamentos de sementes de Soja

The soybean crop is one of the most important in Brazil, the country occupies the second place in production, surpassed only by the United States. To obtain greater yields per area, it is essential, and adequate cultivation techniques, the use of high quality seeds expressed by genetic components, physical, physiological and sanitary. Thus, the aim of this study was to evaluate the efficiency of the use of physical methods for soybean seed treatment by physiological characteristics and health of seeds submitted to thermotherapy and radiotherapy. In the seed health testing treatment with thermotherapy wet method showed significant and a quadratic equation was fitted to describe the results, and in accordance with the model, the number of free soybean phytopathogenic fungi tends to increase with higher time of exposure to 40 ° C. For germination variable, the thermotherapy treatment set a quadratic equation and radiation treatment set a linear equation. Both treatments showed reduced seed germination with increased exposure time of the physical treatments. The variables, plant height, dry weight showed significant (p <0.05) only for the thermotherapy treatment. A quadratic equation for both variables having reduced height and seedling dry weight mediants to increase