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vol. 14, nr. 3 (2009)
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Geometric features of Dracocephalum moldavicum L. seeds after dehulling
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Andrzej Anders:
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Department of Agricultural Engineering and Natural Resources, University of Warmia and Mazury ul. M. Oczapowskiego 11, 10-736 Olsztyn |
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vol. 14 (2009), nr. 3,
pp. 533-541
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abstract:
The conducted research indicates that dehulling of Dracocephalum moldavicum L. seeds must be a multistage process. During the experiment which was carried out with seeds of 6% moisture content, after the first stage of dehulling there remained approximately 73% of non-hulled seeds. When the seeds were dehulled for the second time, there again remained a fraction of non-hulled seeds, amounting to 52%. The low efficiency of dehulling may have resulted from the small size of the seeds and the adhesive force between the husk and the cotyledon. The average surface area calculated for the projections of whole seeds of 6% moisture content was larger by 1.1÷1.17 mm2 in comparison with the surface area of separated cotyledons, and by 0.49÷0.95 mm2 in comparison with the surface area of the projection of the husk separated from the seed. The calculated circularity coefficient was the biggest as refers the projections of separated cotyledons and amounted to 0.72÷0.70. The calculated geometric parameters may be employed in further analysis of the seeds shape and their morphological components (determining shape coefficients, substitute diameters, etc.).
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keywords:
dehulling, Dracocephalum moldavicum, seed coat, cotyledon, seed, geometric features
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original in:
Polish
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