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Optimum ratios of zeolite seed Drying Beads® to dry rice seeds for genebank storage

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A series of experiments were carried out to determine the quantity of zeolite seed Drying Beads® required to dry fresh- and partially-dried rice seeds to the low moisture contents used for genebank storage (6-7% fresh weight). Placing beads over water followed by passive drying at 15% RH, 15°C provided an estimate of the amount of water that would be taken up to strong water-binding sites in the beads, as confirmed by the water uptake isotherms. This may be a more appropriate indicator of the capacity of the beads for water, although not necessarily the amount of water that the beads will actually adsorb from the seeds in a bead-seed system. Mixing freshly harvested rice seeds with dry beads (capacity of approximately 16%) at a ratio of 1 (bead weight to seed weight), should reduce their moisture content to acceptable levels for long-term genebank storage. Pre-drying seeds, while not necessary, will reduce the quantity of beads required. At higher bead-to-seed ratios, final seed moisture content is reduced further, although the beads become less effective as the proportion of water in the seeds that is held in strong-water-binding sites increases.
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Document Type: Research Article

Publication date: December 1, 2013

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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