DEVELOPMENT OF POSTHARVEST TECHNOLOGIES FOR Fi OF PSB RC72H HYBRID RICE: THRESHING, DRYING, STORING

摘要

Based on data obtained from the study; the postharvest technologies developed for the Fi of hybrid rice PSB Rc72H are threshing; drying and storing for optimum seed; quality. A mechanical thresher should have a cylinder speed of 600 to 750 revolutionsper minute (rpm). Increasing the rpm to the speed for inbred rice results in increased loss of half-filled seeds via the blower. Viability of seeds is not affected by method of threshing. Seeds from the mechanical thresher show 94.3 viability and; those from the traditional hand-thrashing (hampasj show 95 o. A moisture content (me) of 9-11 can be attained after 5 hours of sun -drying with stirring every hour under a heat intensity range of 50-67 cal/cm-/hour. This me level is safe for storing Fiseeds and does not cause thermal injury. In cold storage and tin cans; seeds maintain at least 85 a viability after 6 months; in vinyl sack; vinyl sack lined with plastic; cloth bag; and vinyl sack with monthly re-drying; there is significant decline in viability. Regardless of packing material; if seeds are stored at 9-11% me; there is no significant reduction in viability of seeds stored for a maximum of 4 months.