{"data":{"id":"us/7-cfr-201.46","jurisdiction":"us","citation":"7 CFR 201.46","heading":"Weight of working sample.","body":"(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.\n(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.\n(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.\n(d) Coated seed.\n(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.\n(2) Mixtures of coated seed. The working weight shall be determined in the following manner:\n(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.\n(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:\nWeight of coating material = weight of 100 coated units − weight of 100 de-coated units;\nThe percentage of coating material = weight of the coating material divided by the weight of 100 coated units × 100%.\n(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.\nTable 1—Weight of Working Sample\nName of seed Minimum weight for purity analysis (grams) Minimum weight for noxious-weed seed examination (grams) Approximate number of seeds per gram\nAgricultural Seed\nAgrotricum 65 500 39\nAlfalfa 5 50 500\nAlfilaria 5 50 440\nAlyceclover 5 50 665\nBahiagrass:\nVar. Pensacola 5 50 600\nAll other vars. 7 50 365\nBarley 100 500 30\nBarrelclover 10 100 250\nBean:\nAdzuki 200 500 11\nField 500 500 4\nMung 100 500 24\nBeet, field 50 500 55\nBeet, sugar 50 500 55\nBeggarweed, Florida 5 50 440\nBentgrass:\nColonial 0.25 2.5 13,000\nCreeping 0.25 2.5 13,515\nVelvet 0.25 2.5 18,180\nBermudagrass 1 10 3,930\nBermudagrass, giant 1 10 2,950\nBluegrass:\nAnnual 1 10 2,635\nBulbous 4 40 585\nCanada 0.5 5 5,050\nGlaucantha 1 10\nKentucky 1 10 3,060\nNevada 1 10 2,305\nRough 0.5 5 4,610\nTexas 1 10 2,500\nWood 0.5 5 4,330\nBluejoint 0.5 5 8,461\nBluestem:\nBig 7 70 320\nLittle 5 50 525\nSand 10 100 215\nYellow 1 10 1,945\nBottlebrush-squirreltail 9 90 300\nBrome:\nField 5 50 465\nMeadow 13 130 190\nMountain 20 200 140\nSmooth 7 70 315\nBroomcorn 40 400 60\nBuckwheat 50 500 45\nBuffalograss:\n(Burs) 20 200 110\n(Caryopses) 3 30 740\nBuffelgrass:\n(Fascicles) 6 66 365\n(Caryopses) 2 20 1,940\nBurclover, California:\n(in bur) 50 500\n(out of bur) 7 70 375\nBurclover, spotted\n(in bur) 50 500 50\n(out of bur) 5 50 550\nBurnet, little 25 250 110\nButtonclover 7 70 365\nCamelina 4 40 880\nCanarygrass 20 200 150\nCanarygrass, reed 2 20 1,185\nCarpetgrass 1 10 2,230\nCastorbean 500 500 5\nChess, soft 5 50 555\nChickpea 500 500 2\nClover:\nAlsike 2 20 1,500\nArrowleaf 4 40 705\nBerseem 5 50 455\nCluster 1 10 2,925\nCrimson 10 100 330\nKenya 2 20\nLadino 2 20 1,935\nLappa 2 20 1,500\nLarge hop 1 10 5,435\nPersian 2 20 1,415\nRed 5 50 600\nRose 7 70 360\nSmall hop 2 20 1,950\nStrawberry 5 50 635\nSub 25 250 120\nWhite 2 20 1,500\nCorn:\nField 500 500 3\nPop 500 500 3\nCotton 300 500 8\nCowpea 300 500 8\nCrambe 25 250\nCrested dogtail 2 20 1,900\nCrotalaria:\nLance 7 70 375\nShowy 25 250 80\nSlenderleaf 10 100 205\nStriped 10 100 215\nSunn 75 500 35\nCrownvetch 10 100 305\nDallisgrass 4 40 620\nDichondra 5 50 470\nDropseed, sand 0.25 2.5 12,345\nEmmer 100 500 25\nFescue:\nChewings 3 30 900\nHair 1 10\nHard 2 20 1,305\nMeadow 5 50 495\nRed 3 30 900\nSheep 2 20 1,165\nTall 5 50 455\nFlatpea 100 500 25\nFlax 15 150 180\nFoxtail, creeping 1.5 15 1,736\nFoxtail, meadow 3 30 893\nGalletagrass:\n(Other than caryopses) 10 100 260\n(Caryopses) 5 50 580\nGrama:\nBlue 2 20 1,595\nSide-oats:\n(Other than caryopses) 6 60 350\n(Caryopses) 2 20 1,605\nGuar 75 500 35\nGuineagrass 2 20 2,205\nHardinggrass 3 30 750\nHemp 50 500 45\nIndiangrass, yellow 7 70 395\nIndigo, hairy 7 70 435\nJapanese lawngrass 2 20 1,325\nJohnsongrass 10 100 265\nKenaf 50 500\nKochia, forage 2 20 1,070\nKudzu 25 250 80\nLentil 120 500 14-23\nLespedeza:\nKorean 5 50 525\nSericea 3 30 820\nSiberian 3 30 820\nStriate 5 50 750\nLovegrass, sand 1 10 3,585\nLovegrass, weeping 1 10 3,270\nLupine:\nBlue 500 500 7\nWhite 500 500 7\nYellow 300 500 9\nManilagrass 2 20\nMedic, black 5 50 585\nMilkvetch 9 90 270\nMillet:\nBrowntop 8 80 315\nFoxtail 5 50 480\nJapanese 9 90 315\nPearl 15 150 180\nProso 15 150 185\nMolassesgrass 0.5 5 7,750\nMustard:\nBlack 2 20 1,255\nIndia 5 50 625\nWhite 15 150 160\nNapiergrass 5 50\nNeedlegrass, green 7 70 370\nOat 75 500 35-50\nOatgrass, tall 6 60 417\nOrchardgrass 3 30 945\nPanicgrass, blue 2 20 1,370\nPanicgrass, green 2 20 1,305\nPea, field 500 500 4\nPeanut 500 500 1-3\nRadish 30 300 75\nRape:\nAnnual 7 70 345\nBird 7 70 425\nTurnip 5 50 535\nWinter 10 100 230\nRedtop 0.25 2.5 10,695\nRescuegrass 20 200 115\nRhodesgrass 1 10 4,725\nRice 50 500 65\nRicegrass, Indian 7 70 355\nRoughpea 75 500 40\nRye 75 500 40\nRye, mountain 28 280 90\nRyegrass:\nAnnual 5 50 420\nIntermediate 8 80 338\nPerennial 5 50 530\nWimmera 5 50\nSafflower 100 500 30\nSagewort, Louisiana 0.5 5 8,900\nSainfoin 50 500 50\nSaltbush, fourwing 15 150 165\nSesame 7 70 360\nSesbania 25 250 105\nSmilo 2 20 2,010\nSorghum 50 500 55\nSorghum almum 15 150 150\nSorghum-sudangrass 65 500 38\nSorgrass 1 15 150 135\nSourclover 5 50 660\nSoybean 500 500 6-13\nSpelt 100 500 25\nSudangrass 25 250 100\nSunflower 100 500\nSweetclover:\nWhite 5 50 570\nYellow 5 50 570\nSweet vernalgrass 2 20 1,600\nSweetvetch, northern 19 190 130\nSwitchgrass 4 40 570\nTeff 1 10 3,288\nTimothy 1 10 2,565\nTimothy, turf 1 10 2,565\nTobacco 0.5 5 15,625\nTrefoil:\nBig 2 20 1,945\nBirdsfoot 3 30 815\nTriticale 100 500\nVaseygrass 3 30 970\nVeldtgrass 4 40 655\nVelvetbean 500 500 2\nVelvetgrass 1 10 3,360\nVetch:\nCommon 150 500 19\nHairy 75 500 35\nHungarian 100 500 24\nMonantha 100 500\nNarrowleaf 50 500 60\nPurple 100 500 22\nWoollypod 100 500 25\nWheat:\nCommon 100 500 25\nClub 100 500 25\nDurum 100 500 25\nPolish 100 500 25\nPoulard 100 500 25\nWheat × Agrotricum 65 500 38\nWheatgrass:\nBeardless 8 80 275\nFairway crested 4 40 685\nStandard crested 5 50 425\nIntermediate 15 150 175\nPubescent 15 150 180\nSiberian 5 50\nSlender 7 70 295\nStreambank 10 50 370\nTall 15 150 165\nWestern 10 100 250\nWildrye:\nBasin 8 80 317\nCanada 11 110 190\nRussian 6 60 360\nVegetable Seed\nArtichoke 100 500 24\nAsparagus 100 500 25\nAsparagusbean 300 500 8\nBean:\nGarden 500 500 4\nLima 500 500 2\nRunner 500 500 1\nBeet 50 300 60\nBroadbean 500 500\nBroccoli 10 50 315\nBrussels sprouts 10 50 315\nBurdock, great 15 150\nCabbage 10 50 315\nCabbage, Chinese 5 50 635\nCabbage, tronchuda 10 100\nCardoon 100 500\nCarrot 3 50 825\nCauliflower 10 50 315\nCeleriac 1 25 2,520\nCelery 1 25 2,520\nChard, Swiss 50 300 60\nChicory 3 50 940\nChives 5 50\nCitron 200 500 11\nCollards 10 50 315\nCorn, sweet 500 500\nCornsalad:\nVars. Fullhearted and Dark Green Fullhearted 5 50\nAll other vars 10 50 380\nCowpea 300 500 8\nCress:\nGarden 5 50 425\nUpland 2 35 1,160\nWater 1 25 5,170\nCucumber 75 500 40\nDandelion 2 35 1,240\nDill 3 50 800\nEggplant 10 50 230\nEndive 3 50 940\nGherkin, West India 16 160 153\nKale 10 50 315\nKale, Chinese 10 50\nKale, Siberian 8 80 325\nKohlrabi 10 50 315\nLeek 7 50 395\nLettuce 3 50 890\nMelon 50 500 45\nMustard, India 5 50 625\nMustard, spinach 5 50 535\nOkra 100 500 19\nOnion 7 50 340\nOnion, Welsh 10 50\nPak-choi 5 50 635\nParsley 5 50 650\nParsnip 5 50 430\nPea 500 500 3\nPepper 15 150 165\nPumpkin 500 500 5\nRadish 30 300 75\nRhubarb 50 300 60\nRutabaga 5 50 430\nSage 25 150 120\nSalsify 50 300 65\nSavory, summer 2 35 1,750\nSorrel 2 35 1,080\nSoybean 500 500 6-13\nSpinach 25 150 100\nSpinach, New Zealand 200 500 13\nSquash 200 500 14\nTomato 5 50 405\nTomato, husk 2 35 1,240\nTurnip 5 50 535\nWatermelon 200 500 11\n1 Rhizomatous derivatives of a johnsongrass × sorghum cross or a johnsongrass × sudangrass cross.","path":["Title 7—Agriculture","Subtitle B—Regulations of the Department of Agriculture","CHAPTER I—AGRICULTURAL MARKETING SERVICE (STANDARDS, INSPECTIONS, MARKETING PRACTICES), DEPARTMENT OF AGRICULTURE","SUBCHAPTER K—FEDERAL SEED ACT","PART 201—FEDERAL SEED ACT REQUIREMENTS"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-7.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:01Z","sha256":"4732722d7b82371a4f63206774788fc78132dae20a27d19816454aac5efa60ae","source_id":"us-cfr","stale":true,"prev":"us/7-cfr-201.45","next":"us/7-cfr-201.47"},"notice":"GroundRules: Original legal text. Not legal advice."}