Temperaturas de secagem na integridade física, qualidade fisiológica e composi？？o química de sementes de arroz

the drying of seeds is essential for its production process, however, the temperature used can affect seeds quality. this study aimed at evaluating the effect of different temperatures on physical integrity, physiological quality and chemical composition of rice seeds. four lots were arranged for each cultivar, being dried with the aid of the stationary method, by using the following temperatures: 32oc, 38oc, 44oc and 50oc. after each drying treatment, the physical integrity of seeds was analyzed, by evaluating its moisture content and fissures percentage. physiological quality was evaluated with the aid of the germination test, first counting, electrical conductivity, accelerated aging, cold test, total length and dry mass of seedlings. the chemical composition of seeds was determined by evaluating their dry mass, crude protein and fiber and ethereal extract. the drying temperatures affected seeds quality, and when they increased (32-50oc), the percentage of fissures in irrigated rice seeds also increased. drying temperatures of 32oc and 38oc allowed the expression of seed quality, while the temperature of 50oc reduced its physiological potential.