7 CFR 201.46: Weight of working sample.

(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 groups 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 comprise 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 §§ 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 × 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

Name of seed Minimum weight for purity analysis (grams) Minimum weight for noxious-weed seed examination (grams) Approximate number of seeds per gram

Agricultural Seed

Agrotricum 65 500 39

Alfalfa 5 50 500

Alfilaria 5 50 440

Alyceclover 5 50 665

Bahiagrass:

Var. Pensacola 5 50 600

All other vars. 7 50 365

Barley 100 500 30

Barrelclover 10 100 250

Bean:

Adzuki 200 500 11

Field 500 500 4

Mung 100 500 24

Beet, field 50 500 55

Beet, sugar 50 500 55

Beggarweed, Florida 5 50 440

Bentgrass:

Colonial 0.25 2.5 13,000

Creeping 0.25 2.5 13,515

Velvet 0.25 2.5 18,180

Bermudagrass 1 10 3,930

Bermudagrass, giant 1 10 2,950

Bluegrass:

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 4,330

Bluejoint 0.5 5 8,461

Bluestem:

Big 7 70 320

Little 5 50 525

Sand 10 100 215

Yellow 1 10 1,945

Bottlebrush-squirreltail 9 90 300

Brome:

Field 5 50 465

Meadow 13 130 190

Mountain 20 200 140

Smooth 7 70 315

Broomcorn 40 400 60

Buckwheat 50 500 45

Buffalograss:

(Burs) 20 200 110

(Caryopses) 3 30 740

Buffelgrass:

(Fascicles) 6 66 365

(Caryopses) 2 20 1,940

Burclover, California:

(in bur) 50 500

(out of bur) 7 70 375

Burclover, spotted

(in bur) 50 500 50

(out of bur) 5 50 550

Burnet, little 25 250 110

Buttonclover 7 70 365

Camelina 4 40 880

Canarygrass 20 200 150

Canarygrass, reed 2 20 1,185

Carpetgrass 1 10 2,230

Castorbean 500 500 5

Chess, soft 5 50 555

Chickpea 500 500 2

Clover:

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 1,500

Corn:

Field 500 500 3

Pop 500 500 3

Cotton 300 500 8

Cowpea 300 500 8

Crambe 25 250

Crested dogtail 2 20 1,900

Crotalaria:

Lance 7 70 375

Showy 25 250 80

Slenderleaf 10 100 205

Striped 10 100 215

Sunn 75 500 35

Crownvetch 10 100 305

Dallisgrass 4 40 620

Dichondra 5 50 470

Dropseed, sand 0.25 2.5 12,345

Emmer 100 500 25

Fescue:

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 50 455

Flatpea 100 500 25

Flax 15 150 180

Foxtail, creeping 1.5 15 1,736

Foxtail, meadow 3 30 893

Galletagrass:

(Other than caryopses) 10 100 260

(Caryopses) 5 50 580

Grama:

Blue 2 20 1,595

Side-oats:

(Other than caryopses) 6 60 350

(Caryopses) 2 20 1,605

Guar 75 500 35

Guineagrass 2 20 2,205

Hardinggrass 3 30 750

Hemp 50 500 45

Indiangrass, yellow 7 70 395

Indigo, hairy 7 70 435

Japanese lawngrass 2 20 1,325

Johnsongrass 10 100 265

Kenaf 50 500

Kochia, forage 2 20 1,070

Kudzu 25 250 80

Lentil 120 500 14-23

Lespedeza:

Korean 5 50 525

Sericea 3 30 820

Siberian 3 30 820

Striate 5 50 750

Lovegrass, sand 1 10 3,585

Lovegrass, weeping 1 10 3,270

Lupine:

Blue 500 500 7

White 500 500 7

Yellow 300 500 9

Manilagrass 2 20

Medic, black 5 50 585

Milkvetch 9 90 270

Millet:

Browntop 8 80 315

Foxtail 5 50 480

Japanese 9 90 315

Pearl 15 150 180

Proso 15 150 185

Molassesgrass 0.5 5 7,750

Mustard:

Black 2 20 1,255

India 5 50 625

White 15 150 160

Napiergrass 5 50

Needlegrass, green 7 70 370

Oat 75 500 35-50

Oatgrass, tall 6 60 417

Orchardgrass 3 30 945

Panicgrass, blue 2 20 1,370

Panicgrass, green 2 20 1,305

Pea, field 500 500 4

Peanut 500 500 1-3

Radish 30 300 75

Rape:

Annual 7 70 345

Bird 7 70 425

Turnip 5 50 535

Winter 10 100 230

Redtop 0.25 2.5 10,695

Rescuegrass 20 200 115

Rhodesgrass 1 10 4,725

Rice 50 500 65

Ricegrass, Indian 7 70 355

Roughpea 75 500 40

Rye 75 500 40

Rye, mountain 28 280 90

Ryegrass:

Annual 5 50 420

Intermediate 8 80 338

Perennial 5 50 530

Wimmera 5 50

Safflower 100 500 30

Sagewort, Louisiana 0.5 5 8,900

Sainfoin 50 500 50

Saltbush, fourwing 15 150 165

Sesame 7 70 360

Sesbania 25 250 105

Smilo 2 20 2,010

Sorghum 50 500 55

Sorghum almum 15 150 150

Sorghum-sudangrass 65 500 38

Sorgrass 1 15 150 135

Sourclover 5 50 660

Soybean 500 500 6-13

Spelt 100 500 25

Sudangrass 25 250 100

Sunflower 100 500

Sweetclover:

White 5 50 570

Yellow 5 50 570

Sweet vernalgrass 2 20 1,600

Sweetvetch, northern 19 190 130

Switchgrass 4 40 570

Teff 1 10 3,288

Timothy 1 10 2,565

Timothy, turf 1 10 2,565

Tobacco 0.5 5 15,625

Trefoil:

Big 2 20 1,945

Birdsfoot 3 30 815

Triticale 100 500

Vaseygrass 3 30 970

Veldtgrass 4 40 655

Velvetbean 500 500 2

Velvetgrass 1 10 3,360

Vetch:

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 25

Wheat:

Common 100 500 25

Club 100 500 25

Durum 100 500 25

Polish 100 500 25

Poulard 100 500 25

Wheat × Agrotricum 65 500 38

Wheatgrass:

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 10 100 250

Wildrye:

Basin 8 80 317

Canada 11 110 190

Russian 6 60 360

Vegetable Seed

Artichoke 100 500 24

Asparagus 100 500 25

Asparagusbean 300 500 8

Bean:

Garden 500 500 4

Lima 500 500 2

Runner 500 500 1

Beet 50 300 60

Broadbean 500 500

Broccoli 10 50 315

Brussels sprouts 10 50 315

Burdock, great 15 150

Cabbage 10 50 315

Cabbage, Chinese 5 50 635

Cabbage, tronchuda 10 100

Cardoon 100 500

Carrot 3 50 825

Cauliflower 10 50 315

Celeriac 1 25 2,520

Celery 1 25 2,520

Chard, Swiss 50 300 60

Chicory 3 50 940

Chives 5 50

Citron 200 500 11

Collards 10 50 315

Corn, sweet 500 500

Cornsalad:

Vars. Fullhearted and Dark Green Fullhearted 5 50

All other vars 10 50 380

Cowpea 300 500 8

Cress:

Garden 5 50 425

Upland 2 35 1,160

Water 1 25 5,170

Cucumber 75 500 40

Dandelion 2 35 1,240

Dill 3 50 800

Eggplant 10 50 230

Endive 3 50 940

Gherkin, West India 16 160 153

Kale 10 50 315

Kale, Chinese 10 50

Kale, Siberian 8 80 325

Kohlrabi 10 50 315

Leek 7 50 395

Lettuce 3 50 890

Melon 50 500 45

Mustard, India 5 50 625

Mustard, spinach 5 50 535

Okra 100 500 19

Onion 7 50 340

Onion, Welsh 10 50

Pak-choi 5 50 635

Parsley 5 50 650

Parsnip 5 50 430

Pea 500 500 3

Pepper 15 150 165

Pumpkin 500 500 5

Radish 30 300 75

Rhubarb 50 300 60

Rutabaga 5 50 430

Sage 25 150 120

Salsify 50 300 65

Savory, summer 2 35 1,750

Sorrel 2 35 1,080

Soybean 500 500 6-13

Spinach 25 150 100

Spinach, New Zealand 200 500 13

Squash 200 500 14

Tomato 5 50 405

Tomato, husk 2 35 1,240

Turnip 5 50 535

Watermelon 200 500 11

1 Rhizomatous derivatives of a johnsongrass × sorghum cross or a johnsongrass × sudangrass cross.