(a) Unmixed seed. The working samples for purity analysis and noxiousweed seed examination of unmixed seed shall be at least the weights set forth in table 1.
(b) Mixtures consisting of one predominant kind of seed or a group of kinds of similar size. The weights of the purity and noxious-weed seed working samples in this category shall be determined by the kind or group of kinds which compromise more than 50 percent of the sample.
(c) Mixtures consisting of two or more kinds or groups of kinds of different sizes, none of which comprise over 50 percent of the sample. The weights of the purity working samples in this category shall be the weighted averages (to the nearest half gram) of the weights listed in table 1 for each of the kinds which comprise the sample determined by the following method: (1) Multiply the percentage of each component in the mixture (rounded off to the nearest whole number) by the sample sizes specified in column 2, table 1, (2) add all these products, (3) total the percentages of all components of the mixtures, and (4) divide the sum in paragraph (c)(2) of this section by the total in paragraph (c)(3) of this section. If the approximate percentage of the components of a mixture are not known they may be estimated. The weight of the noxious-weed seed working sample shall be determined by multiplying the weight of the purity working sample by 10 or by calculating the weighted average in the same manner described above for the purity working sample.
(d) Coated seed.
(1) Unmixed coated seed. Due to variation in the weight of coating materials, the size or weight of the working sample shall be determined separately for each lot. The weight of the working sample shall be determined by weighing 100 completely coated units and calculating the weight of 2,500 coated units for the purity analysis and 25,000 coated units for the noxious-weed seed examination.
(2) Mixtures of coated seed. The working weight shall be determined in the following manner:
(i) Calculate the weight of the working sample to be used for the mixture under consideration as though the sample were not coated by following paragraph (b) or (c) of this section.
(ii) Determine the amount of coating material on 100 coated units by weighing the coated units. Remove the coating material using the methods described in Secs. 201.51b (c) and (d). Calculate the percentage of coating material using the following formulas: Weight of coating material = weight of 100 coated units - weight of 100 de-coated units;The percentage of coating material = weight of the coating material divided by the weight of 100 coated units x 100%.
(iii) The weight of the working sample shall be the product of the weight calculated in paragraph (d)(2)(i) of this section multiplied by 100 percent, divided by 100 percent minus the percentage of coating material calculated in paragraph (d)(2)(ii) of this section.
Table 1--Weight of Working Sample------------------------------------------------------------------------
Minimum
Minimum weight for Approximate
weight for noxious- number of
Name of seed purity weed seed seeds per
analysis examination gram
(grams) (grams)------------------------------------------------------------------------
Agricultural SeedAgrotricum........................ 65 500 39Alfalfa........................... 5 50 500Alfilaria......................... 5 50 440Alyceclover....................... 5 50 665Bahiagrass:
Var. Pensacola................ 5 50 600
All other vars................ 7 50 365Barley............................ 100 500 30Barrelclover...................... 10 100 250Bean:
Adzuki........................ 200 500 11
Field......................... 500 500 4
Mung.......................... 100 500 24Beet, field....................... 50 500 55Beet, sugar....................... 50 500 55Beggarweed, Florida............... 5 50 440Bentgrass:
Colonial...................... 0.25 2.5 13,000
Creeping...................... 0.25 2.5 13,515
Velvet........................ 0.25 2.5 18,180Bermudagrass...................... 1 10 3,930Bermudagrass, giant............... 1 10 2,950Bluegrass:
Annual........................ 1 10 2,635
Bulbous....................... 4 40 585
Canada........................ 0.5 5 5,050
Glaucantha.................... 1 10 ...........
Kentucky...................... 1 10 3,060
Nevada........................ 1 10 2,305
Rough......................... 0.5 5 4,610
Texas......................... 1 10 2,500
Wood.......................... 0.5 5 4,330Bluejoint......................... 0.5 5 8,461Bluestem:
Big........................... 7 70 320
Little........................ 5 50 525
Sand.......................... 10 100 215
Yellow........................ 1 10 1,945Bottlebrush-squirreltail.......... 9 90 300Brome:
Field......................... 5 50 465
Meadow........................ 13 130 190
Mountain...................... 20 200 140
Smooth........................ 7 70 315Broomcorn......................... 40 400 60Buckwheat......................... 50 500 45Buffalograss:
(Burs)........................ 20 200 110
(Caryopses)................... 3 30 740Buffelgrass:
(Fascicles)................... 6 66 365
(Caryopses)................... 2 20 1,940Burclover, California:
(in bur)...................... 50 500 ...........
(out of bur).................. 7 70 375Burclover, spotted
(in bur)...................... 50 500 50
(out of bur).................. 5 50 550Burnet, little.................... 25 250 110Buttonclover...................... 7 70 365Canarygrass....................... 20 200 150Canarygrass, reed................. 2 20 1,185Carpetgrass....................... 1 10 2,230Castorbean........................ 500 500 5Chess, soft....................... 5 50 555Chickpea.......................... 500 500 2Clover:
Alsike........................ 2 20 1,500
Arrowleaf..................... 4 40 705
Berseem....................... 5 50 455
Cluster....................... 1 10 2,925
Crimson....................... 10 100 330
Kenya......................... 2 20
Ladino........................ 2 20 1,935
Lappa......................... 2 20 1,500
Large hop..................... 1 10 5,435
Persian....................... 2 20 1,415
Red........................... 5 50 600
Rose.......................... 7 70 360
Small hop..................... 2 20 1,950
Strawberry.................... 5 50 635
Sub........................... 25 250 120
White......................... 2 20 1,500Corn:
Field......................... 500 500 3
Pop........................... 500 500 3Cotton............................ 300 500 8Cowpea............................ 300 500 8Crambe............................ 25 250Crested dogtail................... 2 20 1,900Crotalaria:
Lance......................... 7 70 375
Showy......................... 25 250 80
Slenderleaf................... 10 100 205
Striped....................... 10 100 215
Sunn.......................... 75 500 35Crownvetch........................ 10 100 305Dallisgrass....................... 4 40 620Dichondra......................... 5 50 470Dropseed, sand.................... 0.25 2.5 12,345Emmer............................. 100 500 25Fescue:
Chewings...................... 3 30 900
Hair.......................... 1 10
Hard.......................... 2 20 1,305
Meadow........................ 5 50 495
Red........................... 3 30 900
Sheep......................... 2 20 1,165
Tall.......................... 5 50 455Flatpea........................... 100 500 25Flax.............................. 15 150 180Foxtail, creeping................. 1.5 15 1,736Foxtail, meadow................... 3 30 893Galletagrass:
(Other than caryopses)........ 10 100 260
(Caryopses)................... 5 50 580Grama:
Blue.......................... 2 20 1,595
Side-oats:
(Other than caryopses).... 6 60 350
(Caryopses)............... 2 20 1,605Guar.............................. 75 500 35Guineagrass....................... 2 20 2,205Hardinggrass...................... 3 30 750Hemp.............................. 50 500 45Indiangrass, yellow............... 7 70 395Indigo, hairy..................... 7 70 435Japanese lawngrass................ 2 20 1,325Johnsongrass...................... 10 100 265Kenaf............................. 50 500
Kochia, forage.................... 2 20 1,070Kudzu............................. 25 250 80Lentil............................ 120 500 14-23Lespedeza:
Korean........................ 5 50 525
Sericea....................... 3 30 820
Siberian...................... 3 30 820
Striate....................... 5 50 750Lovegrass, sand................... 1 10 3,585Lovegrass, weeping................ 1 10 3,270Lupine:
Blue.......................... 500 500 7
White......................... 500 500 7
Yellow........................ 300 500 9Manilagrass....................... 2 20Medic, black...................... 5 50 585Milkvetch......................... 9 90 270Millet:
Browntop...................... 8 80 315
Foxtail....................... 5 50 480
Japanese...................... 9 90 315
Pearl......................... 15 150 180
Proso......................... 15 150 185Molassesgrass..................... 0.5 5 7,750Mustard:
Black......................... 2 20 1,255
India......................... 5 50 625
White......................... 15 150 160Napiergrass....................... 5 50Needlegrass, green................ 7 70 370Oat............................... 75 500 35-50Oatgrass, tall.................... 6 60 417Orchardgrass...................... 3 30 945Panicgrass, blue.................. 2 20 1,370Panicgrass, green................. 2 20 1,305Pea, field........................ 500 500 4Peanut............................ 500 500 1-3Rape:
Annual........................ 7 70 345
Bird.......................... 7 70 425
Turnip........................ 5 50 535
Winter........................ 10 100 230Redtop............................ 0.25 2.5 10,695Rescuegrass....................... 20 200 115Rhodesgrass....................... 1 10 4,725Rice.............................. 50 500 65Ricegrass, Indian................. 7 70 355Roughpea.......................... 75 500 40Rye............................... 75 500 40Rye, mountain..................... 28 280 90Ryegrass:
Annual........................ 5 50 420
Intermediate.................. 8 80 338
Perennial..................... 5 50 530
Wimmera....................... 5 50Safflower......................... 100 500 30Sagewort, Louisiana............... 0.5 5 8,900Sainfoin.......................... 50 500 50Saltbush, fourwing................ 15 150 165Sesame............................ 7 70 360Sesbania.......................... 25 250 105Smilo............................. 2 20 2,010Sorghum........................... 50 500 55Sorghum almum..................... 15 150 150Sorghum-sudangrass................ 65 500 38Sorgrass \1\...................... 15 150 135Sourclover........................ 5 50 660Soybean........................... 500 500 6-13Spelt............................. 100 500 25Sudangrass........................ 25 250 100Sunflower......................... 100 500Sweetclover:
White......................... 5 50 570
Yellow........................ 5 50 570Sweet vernalgrass................. 2 20 1,600Sweetvetch, northern.............. 19 190 130Switchgrass....................... 4 40 570Timothy........................... 1 10 2,565Timothy, turf..................... 1 10 2,565Tobacco........................... 0.5 5 15,625Trefoil:
Big........................... 2 20 1,945
Birdsfoot..................... 3 30 815Triticale......................... 100 500Vaseygrass........................ 3 30 970Veldtgrass........................ 4 40 655Velvetbean........................ 500 500 2Velvetgrass....................... 1 10 3,360Vetch:
Common........................ 150 500 19
Hairy......................... 75 500 35
Hungarian..................... 100 500 24
Monantha...................... 100 500
Narrowleaf.................... 50 500 60
Purple........................ 100 500 22
Woollypod..................... 100 500 25Wheat:
Common........................ 100 500 25
Club.......................... 100 500 25
Durum......................... 100 500 25
Polish........................ 100 500 25
Poulard....................... 100 500 25WheatxAgrotricum.................. 65 500 38Wheatgrass:
Beardless..................... 8 80 275
Fairway crested............... 4 40 685
Standard crested.............. 5 50 425
Intermediate.................. 15 150 175
Pubescent..................... 15 150 180
Siberian...................... 5 50 ...........
Slender....................... 7 70 295
Streambank.................... 10 50 370
Tall.......................... 15 150 165
Western....................... 10 100 250Wildrye:
Basin......................... 8 80 317
Canada........................ 11 110 190
Russian....................... 6 60 360
Vegetable SeedArtichoke......................... 100 500 24Asparagus......................... 100 500 25Asparagusbean..................... 300 500 8Bean:
Garden........................ 500 500 4
Lima.......................... 500 500 2
Runner........................ 500 500 1Beet.............................. 50 300 60Broadbean......................... 500 500 ...........Broccoli.......................... 10 50 315Brussels sprouts.................. 10 50 315Burdock, great.................... 15 150 ...........Cabbage........................... 10 50 315
Cabbage, Chinese.................. 5 50 635Cabbage, tronchuda................ 10 100 ...........Cardoon........................... 100 500 ...........Carrot............................ 3 50 825Cauliflower....................... 10 50 315Celeriac.......................... 1 25 2,520Celery............................ 1 25 2,520Chard, Swiss...................... 50 300 60Chicory........................... 3 50 940Chives............................ 5 50 ...........Citron............................ 200 500 11Collards.......................... 10 50 315Corn, sweet....................... 500 500 ...........Cornsalad:
Vars. Fullhearted and Dark 5 50 ...........
Green Fullhearted............
All other vars................ 10 50 380Cowpea............................ 300 500 8Cress:
Garden........................ 5 50 425
Upland........................ 2 35 1,160
Water......................... 1 25 5,170Cucumber.......................... 75 500 40Dandelion......................... 2 35 1,240Dill.............................. 3 50 800Eggplant.......................... 10 50 230Endive............................ 3 50 940Gherkin, West India............... 16 160 153Kale.............................. 10 50 315Kale, Chinese..................... 10 50 ...........Kale, Siberian.................... 8 80 325Kohlrabi.......................... 10 50 315Leek.............................. 7 50 395Lettuce........................... 3 50 890Melon............................. 50 500 45Mustard, India.................... 5 50 625Mustard, spinach.................. 5 50 535Okra.............................. 100 500 19Onion............................. 7 50 340Onion, Welsh...................... 10 50 ...........Pak-choi.......................... 5 50 635Parsley........................... 5 50 650Parsnip........................... 5 50 430Pea............................... 500 500 3Pepper............................ 15 150 165Pumpkin........................... 500 500 5Radish............................ 30 300 75Rhubarb........................... 50 300 60Rutabaga.......................... 5 50 430Sage.............................. 25 150 120Salsify........................... 50 300 65Savory, summer.................... 2 35 1,750Sorrel............................ 2 35 1,080Soybean........................... 500 500 6-13Spinach........................... 25 150 100Spinach, New Zealand.............. 200 500 13Squash............................ 200 500 14Tomato............................ 5 50 405Tomato, husk...................... 2 35 1,240Turnip............................ 5 50 535Watermelon........................ 200 500 11------------------------------------------------------------------------\1\ Rhizomatous derivatives of a johnsongrassxsorghum cross or a
johnsongrassxsudangrass cross. [25 FR 8769, Sept. 13, 1960, as amended at 30 FR 7888, June 18, 1965; 32 FR 12780, Sept. 6, 1967; 35 FR 6108, Apr. 15, 1970; 41 FR 20156, May 17, 1976; 46 FR 53635, Oct. 29, 1981; 59 FR 64492, Dec. 14, 1994; 65 FR 1707, Jan. 11, 2000]