RESUMO -O trabalho visou à minimização das perdas na qualidade fisiológica das sementes de arroz irrigado pelo adequado uso de temperaturas de condicionamento do ar durante a secagem intermitente. Sementes de arroz, cultivar EL Paso L-144, foram secadas em secador industrial intermitente, marca Pampeiro, fluxo misto, com capacidade estática de 11000 kg, em quatro manejos do ar de secagem: 1) secagem com temperatura do ar constante a 40°C; 2) secagem com temperatura do ar constante a 60°C; 3) secagem com temperatura do ar crescente (até 60°C) nas primeiras duas horas e a partir da segunda hora constante a 60°C; 4) secagem com temperatura do ar crescente (até 60°C) nas primeiras duas e decrescente até o término da secagem. Após as sementes foram armazenadas, nas condições ambientais por 180 dias e analisadas quanto a qualidade aos zero, 90 e 180 dias, através dos testes de germinação, primeira contagem da germinação, envelhecimento acelerado, frio sem solo e emergência de plântulas em campo. Concluiu-se que a secagem intermitente empregando temperatura constante do ar a 60°C afeta negativamente a qualidade fisiológica de semente de arroz e que o uso de temperaturas crescentes até 60°C na secagem intermitente proporciona a manutenção da qualidade fisiológica de sementes de arroz.Termos para indexação: Oryza sativa, temperatura de secagem, qualidade fisiológica. INTERMITENT DRYING OF LOW LAND RICE SEEDSABSTRACT -This work aimed to maintain the physiological quality of rice seeds through the adequate use of air temperatures during the drying. The rice seeds cultivar El Paso L-144 were dried in an intermittent drying system, with capacity for 11.000 kg, under four drying conditions: 1) at constant temperature of 40°C; 2) constant temperature of 60°C ; 3) at gradual increasing temperature (since 60°C) during the first two hours and constant temperature of 60°C until the end of the drying cycle; 4) at gradual increasing temperature (since 60°C) in the first two hours and gradual decreasing temperature until the end of drying cycle. The seeds were kept in bags made of trussed plastic yarns at room temperature and local environment conditions, for the period of 180 days and analyzed how much the physiological quality at zero, 90 and 180 days. The storage system was conventional. The vigour (through accelerated aging, field emergency test and cold test) test were analyzed. In conclusion, the intermittent drying process at a constant temperature of 60°C is don't preserves the seed quality; finally, the gradual increased temperature also preserves the physiological quality of rice seed.
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