Graduate Thesis Or Dissertation
 

Effect of lot size on lot uniformity in Lolium spp. seed

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  • Studies were conducted to determine the uniformity of three commercial seed lots of ryegrass (Lolium spp.) and the effects of lot size on lot uniformity. Individual bag-samples were taken from each seed lot. Factors considered were percentage purity, annual ryegrass, perennial ryegrass, weed, other crop, inert matter, and germination. Number of rattail fescue (Festuca myuros) seeds and number of orchardgrass (Dactylis glomerata) seeds in a purity sample were counted, and number of noxious weed seeds were also totaled. Uniformity in 30,000 kilogram lots was measured by an H-test, heterogeneity value, state seed law labeling tolerance tables, and by a Chi-square test for homogeneity of a binomial distribution on each sub-lot. Subdivisionsof each seed lot were examined for uniformity by use of an analysis of variance test. The analysis used within sublot variance of lot size approximately 1,500 kilograms as an acceptable level of variation and used an analysis of variance test to examine variance among sub-lots of approximate size 1,500, 3,000, 6,000, and 12,000 kilograms. The greatest potential for violation in labeling and nonuniformity in ryegrass seed lots was found in percentage perennial ryegrass and annual ryegrass factors calculated by formula from fluorescence. Changing seed lot size had no effect on lot uniformity. Reducing the lot size below the current 24,947 kilogram limit did not significantly reduce the number of violations in labeling. Fewer violations were found in high purity seed lots than in low purity seed lots.
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