Development of post harvest technologies for F1 hybrids rice seed production
2003
Guzman, E.D. | Oli, G.M. | Caranguian, L.M. | Calimag, M.L. | Dante, G.G. | Egipto, E.S. | Manuel, R.T. | Caranguian, L. (Department of Agriculture, Minanga Norte, Iguig, Cagayan (Philippines). Cagayan Valley Lowland and Marine Research Outreach Station)
The post harvest technologies developed are threshing, drying and storing of F1 hybrid seeds. Evaluation of the rice thresher determined the appropriate cylinder speed in threshing F1 hybrid rice. A thresher driven by 16 hp gasoline engine should have a cylinder speed of 600 to 750 revolution per minute (rpm). Increasing the rpm to the speed for inbred rice results in increased blower loss of half-filled seeds. Mechanical threshing did not cause significant mechanical injury since the resulting viability of seeds was 94.3% compared to the traditional practice with 95% viability. Results of drying evaluation showed that a moisture content of 9-11% can be attained within 2 days of five hours cumulative sun drying in a net canvas stirred at one hour interval under heat intensity range of 50-67 cal/sq cm/hr. This light intensity is equivalent to prevailing sunlight during summer. Storage techniques that could maintain the viability of F1 hybrid seeds with at least 85% after six months of storage were evaluated using thin can, vinyl sack lined with plastic, cloth bags and vinyl sack with monthly re-drying. Significant decline in viability is apparent after 6 months except seeds stored in cold storage and tin cans. No significant change in seed viability if stored within 4 months, regardless of packaging material, if F1 seeds are dried at 9-11% moisture content. This moisture level did not cause thermal injury to F1 seeds
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