For purity: Allowing "a" to represent the component being considered 

 and "b" the difference between that percentage and 100, according to the 

 following forraiAla: 



( a X b ) 



Pure seed tolerance — 0.6 •/- (0.2 X ) 



( 100 ) 



a sample of timothy guaranteed 99-20^ could test as low as 98 -^^^ and be 

 "satisfactory." 



For germination: The following tolerances are applicable: 



Mean: Tolerance 



9^ or over 5 



90 or over but less than 96 6 



80 or over but less than 90 T 



70 or over but less than 80 . 8 



60 or over but less than 70 9 



Less than 60 10 



Therefore, a sample of seed guaranteed 0% for germination may be as low as 

 78/0 and be "satisfactory." 



For weed seeds: The law requires in the labeling of agricultural seed 



(1) that the percentage of all weed seeds present shall be sho^ra on the tag 



(2) that no primary noxious weed seeds shall be present in the sample, and 



(3) that, if present, the names of the kinds of secondary noxious weed seed 

 and the rate of occurrence of each shall be stated: (A) Per ounce in Agros- 

 tis spp., Poa spp., Rhodes grass, Bennuda grass, timothy, orcliard grass 

 fescues, alsike and white clover, reed canary grass, Dallis grass, ryegrass, 

 foxtail millet, crimson clover, Brassica spp., flax, Agropyron, spp., and 

 other agricultural seeds of similar size and weight, or mixtures within this 

 group, and 



(b) Per pound in proso, Sudan grass, wheat, oats, rye, barley, buck- 

 wheat, sorghums, vetches, and other agricultural seeds of a size and weight 

 similar to or greater than those vritliin tMs group or any mixtures within 

 this group. 



Certain tolerances are allowed, however, to provide for variation and 

 unavoidable errors, but only within very narrow limits and for which there 

 is always a standard formula for computation. Examples: (l) Timothy guaran- 

 teed only 2 per cent weed seeds will not be condemned if it has a 2,59 per 

 cent. (2) No primajry noxious weed seeds are allowed, but the presence of two 

 such seeds in 50 grams of timothy would not be considered a violation. 

 (3) Similarly, some slight variation from the minimum requirement for label- 

 ing secondary noxious v/eed seeds v/ill be passed as satisfactory. 



Free Testing 



The Seed Testing Laboratory will allow two free tests, in a given year, 

 to any resident company or person of New Hampshire, but such seeds must be 

 received in the laboratory during the months of October, November, December 

 and January. This number of samples, not including raixtixres, may be analyzed 

 either for purity or for germination, or one sample for both purity and ger- 



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