A comparison of four methods of sampling small seeds Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ww72bf70s

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  • Sampling studies were conducted to compare the efficiency of the four officially recommended methods of sampling small seeds: automatic sampling--at two sampling speeds, hand sampling, Nobbe tier sampling, and stick trier sampling. Synthetic lots of orchard-grass, ryegrass, Kentucky bluegrass, and alfalfa seed were prepared containing known numbers of the common weed and other crop seed contaminants of these species. Samples were taken systematically from each of the synthetic lots by each of the four methods. The samples were analyzed and the results were statistically evaluated using the t-test for individual contaminant analyses and the F-test for total sample contaminant analyses. Automatic sampling was shown to be an accurate method of sampling all the small seed species studied. In addition, the results clearly demonstrate that increasing the sample cutter speed does not affect the accuracy of automatic sampling. Hand sampling and Nobbe tier sampling were less accurate methods of sampling, however, was demonstrated to be an inaccurate method of sampling all the small seeds studied.
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