7 CFR 201.46 - Weight of working sample.

View all text of Subjgrp 330 [§ 201.45 - § 201.52]

§ 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.

[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; 85 FR 40580, July 7, 2020]