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Electronic Code of Federal Regulations

e-CFR data is current as of February 13, 2020

Title 7Subtitle BChapter ISubchapter KPart 201 → Subject Group


Title 7: Agriculture
PART 201—FEDERAL SEED ACT REGULATIONS


tolerances

§201.59   Application.

Tolerances shall be recognized between the percentages or rates of occurrence found by analysis, test, or examination in the administration of the act and percentages or rates of occurrence required or stated as required by the act. Tolerances for purity percentages and germination percentages provided for in §§201.60 and 201.63 shall be determined from the mean of (a) the results being compared, or (b) the result found by test and the figures shown on a label, or (c) the result found by test and a standard. All other tolerances, including tolerances for pure-live seed and fluorescence, and tolerances for purity based on 10 to 1,000 seeds, seedlings, or plants shall be determined from the result or results found in the administration of the Act.

[5 FR 34, Jan. 4, 1940, as amended at 20 FR 7940, Oct. 21, 1955; 24 FR 3954, May 15, 1959; 35 FR 6108, Apr. 15, 1970]

§201.60   Purity percentages.

(a)(1) The tolerance for a given percentage of the purity components is the same whether for pure seed, other crop seed, weed seed, or inert matter. Wider tolerances are provided when 33 percent or more of the sample is composed of seed plus empty florets and/or empty spikelets of the following chaffy kinds: bentgrasses, bermudagrasses, bluegrasses, bluestems, bottlebrush- squirreltail, bromes, buffalograss, buffelgrass, carpetgrass, soft chess, dallisgrass, fescues, foxtails, galletagrass, guineagrass, gramas, molassesgrass, tall oatgrass, orchardgrass, redtop, rescuegrass, rhodesgrass, Indian ricegrass, ryegrasses, sweet vernalgrass, vaseygrass, veldtgrass, wheatgrasses, wildryes, and yellow indiangrass. The wider tolerances do not apply to seed devoid of hulls.

(2) To determine the tolerance for any purity percentage found in the administration of the act, the percentage found is averaged (i) with that claimed or shown on a label or (ii) with a specified standard. The tolerance is found from this average. If more than one test is made, all except any test obviously in error shall be averaged and the result treated as a single percentage.

(b) The tolerances found in columns C and D for the respective purity percentages shown in columns A and B of table No. 3 shall be used for (1) unmixed seed and (2) mixtures in which the particle-weight ratio is 1:1 to 1.49:1, inclusive. Tolerances for intermediate percentages not shown in table 3 shall be obtained by interpolation.

Table 3—Tolerances for Any Component of a Purity Analysis for (1) Unmixed Seed or (2) Mixed Seed in Which the Particle Weight Ratio Is 1: 1 to 1.49: 1, Inclusive

Average analysis (A)(B)Nonchaffy seeds (C)Chaffy seeds (D)
99.95-100.000.00-0.040.130.16
99.90-99.94.05-.09.20.23
99.85-99.89.10-.14.24.29
99.80-99.84.15-.19.28.34
99.75-99.79.20-.24.32.37
99.70-99.74.25-.29.35.41
99.65-99.69.30-.34.37.45
99.60-99.64.35-.39.40.48
99.55-99.59.40-.44.42.50
99.50-99.54.45-.49.44.53
99.40-99.49.50-.59.47.57
99.30-99.39.60-.69.51.60
99.20-99.29.70-.79.54.64
99.10-99.19.80-.89.57.66
99.00-99.09.90-.99.59.70
98.75-98.991.00-1.24.64.75
98.50-98.741.25-1.49.71.82
98.25-98.491.50-1.74.76.89
98.00-98.241.75-1.99.82.95
97.75-97.992.00-2.24.871.01
97.50-97.742.25-2.49.921.07
97.25-97.492.50-2.74.961.12
97.00-97.242.75-2.991.001.17
96.50-96.993.00-3.491.061.24
96.00-96.493.50-3.991.141.34
95.50-95.994.00-4.491.211.41
95.00-95.494.50-4.991.271.49
94.00-94.995.00-5.991.361.60
93.00-93.996.00-6.991.471.73
92.00-92.997.00-7.991.581.85
91.00-91.998.00-8.991.671.96
90.00-90.999.00-9.991.752.06
88.00-89.9910.00-11.991.872.19
86.00-87.9912.00-13.992.012.36
84.00-85.9914.00-15.992.142.51
82.00-83.9916.00-17.992.242.64
80.00-81.9918.00-19.992.352.76
78.00-79.9920.00-21.992.442.86
76.00-77.9922.00-23.992.522.96
74.00-75.9924.00-25.992.593.04
72.00-73.9926.00-27.992.653.12
70.00-71.9928.00-29.992.713.19
65.00-69.9930.00-34.992.803.29
60.00-64.9935.00-39.992.893.40
50.00-59.9940.00-49.992.963.48

(c) Tolerances calculated by the following formula shall be used for either chaffy or nonchaffy mixtures when the average particle-weight ratio is 1.5:1 to 20:1 and beyond:

The symbols used in the formula are as follows:

T = tolerance being calculated.

A = percent which the weight of the component with the heavier average particle-weight is of the weight of both components.

B = percent which the weight of the component with the lighter average particle-weight is of the weight of both components.

H = average particle-weight for the component with the heavier average particle-weight.

L = average particle-weight for the component with the lighter average particle-weight.

R = ratio of the average particle-weight for the component with the heavier average particle-weight to the average particle-weight for the component with the lighter average particle-weight. R = H / L.

eCFR graphic er14de94.003.gif

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T1 = regular tolerance for the kind of seed (chaffy or nonchaffy) and for (100B)/(B + A/R).

In determining the values for A and B in the formula, the sample shall be regarded as composed of two parts:

(1) The kind, type, or variety under consideration, and

(2) All other components. Values for H and L shall be obtained from the last column of Table 1, §201.46, or by laboratory tests for inert matter, weed seeds, or crop seeds where such values are not obtainable from Table 1. In computing tolerances for nonchaffy kinds the values for T1 are taken from column C of Table 3, and for chaffy kinds the values for T1 are taken from column D of Table 3.

[26 FR 10036, Oct. 26, 1961, as amended at 59 FR 64515, Dec. 14, 1994; 65 FR 1709, Jan. 11, 2000]

§201.61   Fluorescence percentages in ryegrasses.

Tolerances for 400-seed fluorescence tests shall be those set forth in the following table plus one-half the regular pure-seed tolerance determined in accordance with §201.60. When only 200 seeds of a component in a mixture are tested, an additional 2 percent shall be added to the fluorescence tolerance.

Percent found fluorescence tolerance

100
991.0
981.6
972.0
962.3
952.6
942.9
933.2
923.4
913.6
903.8
894.0
884.1
874.3
864.5
854.7
844.8
834.9
825.0
815.2
805.3
795.4
785.5
775.6
765.7
755.8
745.8
735.9
726.0
716.1
706.2
696.2
686.3
676.3
666.4
656.5
646.5
636.5
626.6
616.6
606.7
596.7
586.8
576.8
566.8
556.8
546.9
536.9
526.9
516.9
506.9
496.9
486.9
476.9
466.9
456.9
446.9
436.9
426.9
416.9
406.9
396.8
386.8
376.8
366.8
356.7
346.7
336.7
326.6
316.6
306.5
296.5
286.4
276.4
266.3
256.2
246.2
236.1
226.0
215.9
205.8
195.7
185.6
175.5
165.4
155.3
145.2
135.0
124.9
114.7
104.6
94.4
84.2
74.0
63.7
53.5
43.2
32.8
22.4
11.8
01.0

[32 FR 12781, Sept. 6, 1967, as amended at 59 FR 64516, Dec. 14, 1994]

§201.62   Tests for determination of percentages of kind, variety, type, hybrid, or offtype.

Tolerances for tests for determination of percentages of kind, variety, type, hybrid, or offtype shall be those set forth in the following table, added to one-half the required pure seed tol- erances determined in accordance with §201.60, except that one-half the pure seed tolerance will not be applied in determining tolerances for hybrids labeled on the basis of the percentage of pure seed which is hybrid.

Table 4—Tolerances for Purity Tests, When Results Are Based on 10 to 1,000 Seeds, Seedlings, or Plants Used in a Test

Seed, seedling, or plant count percentNumber of seeds, seedlings, or plants in tests
10203050751001502004008001,000
100 or 00   0   0   0   0   0   0   0   0   0   0   
98 or 210.37.36.04.63.83.32.72.31.61.21.0
96 or 414.410.28.36.45.34.63.73.22.31.71.5
94 or 617.512.410.17.86.45.54.53.92.92.11.9
92 or 820.014.111.58.97.36.35.24.53.42.42.2
90 or 1022.115.712.89.98.17.05.74.93.82.82.4
88 or 1224.017.013.810.78.77.66.25.44.13.02.7
86 or 1425.718.114.711.49.38.16.65.74.53.22.9
84 or 1626.919.015.512.19.88.57.06.04.83.43.0
82 or 1828.220.016.412.610.38.97.36.35.03.63.2
80 or 2029.520.916.913.210.79.37.66.65.33.83.3
78 or 2230.521.617.613.611.09.67.96.85.53.93.5
76 or 2431.422.318.214.111.59.98.17.05.74.13.6
74 or 2632.322.818.614.411.810.28.37.25.84.23.7
72 or 2833.023.419.014.812.110.58.57.46.04.33.8
70 or 3033.723.819.515.112.310.78.77.56.24.43.9
68 or 3234.324.319.915.412.510.88.97.76.34.54.0
66 or 3435.024.720.215.712.711.09.07.86.44.64.0
64 or 3635.425.020.515.812.911.29.17.96.54.64.1
62 or 3835.525.420.615.913.011.39.28.06.64.74.2
60 or 4036.125.720.916.113.211.49.38.16.74.84.2
58 or 4236.225.721.016.213.311.59.48.16.84.84.2
56 or 4436.525.821.016.413.311.59.48.26.84.84.3
54 or 4636.825.821.216.413.411.69.58.26.94.94.3
52 or 4836.825.921.216.513.411.69.58.26.94.94.3
5036.825.921.316.513.411.69.58.26.94.94.3

[32 FR 12781, Sept. 6, 1967, as amended at 33 FR 10841, July 31, 1968; 35 FR 6108, Apr. 15, 1970; 59 FR 64516, Dec. 14, 1994]

§201.63   Germination.

The following tolerances are applicable to the percentage of germination and also to the sum of the germination plus the hard seed when 400 or more seeds are tested.

Mean (See §201.59)Tolerance
96 or over5
90 or over but less than 966
80 or over but less than 907
70 or over but less than 808
60 or over but less than 709
Less than 6010

When only 200 seeds of a component in a mixture are tested 2 percent shall be added to the above germination tolerances.

[15 FR 2399, Apr. 28, 1950, as amended at 20 FR 7940, Oct. 21, 1955]

§201.64   Pure live seed.

The tolerance for pure live seed shall be determined by applying the respective tolerances to the germination plus the hard seed and the pure seed.

[5 FR 35, Jan. 4, 1940. Redesignated at 20 FR 7940, Oct. 21, 1955]

§201.65   Noxious-weed seeds in interstate commerce.

Tolerances for rates of occurrence of noxious-weed seeds shall be recognized and shall be applied to the number of noxious-weed seeds found by analysis in the quantity of seed specified for noxious-weed seed determinations in §201.46, except as provided in §201.16(b). Rates per pound or ounce must be converted to the equivalent number of seeds found in §201.46, Table 1, Minimum weight for noxious-weed seed examination (grams). Some tolerances are listed in the following table. The number found as represented by the label or test (Column X) will be considered within tolerance if not more than the corresponding numbers in Column Y are found by analysis in the administration of the Act. For numbers of seed greater than those in the table, a tolerance based on a degree of certainty of 5 percent (P = 0.05) can be calculated by the formula, Y = X + 1.65√X + 0.03, where X is the number of seeds represented by the label or test and Y is the maximum number within tolerance.

Number represented by label or testMaximum number within tolerancesNumber represented by label or testMaximum number within tolerancesNumber represented by label or testMaximum number within tolerances
(X)(Y)(X)(Y)(X)(Y)
0234436881
1235446982
2436457083
3537467184
4738477285
5839497386
6940507487
71141517589
81242527690
91343537791
101444547892
111645557993
121746568094
131847588195
141948598296
152149608397
162250618498
172351628599
1824526386101
1925536487102
2027546588103
2128556789104
2229566890105
2330576991106
2431587092107
2532597193108
2634607294109
2735617395110
2836627496111
2937637597112
3038647698114
3139657899115
32416679100116
33426780

[76 FR 31794, June 2, 2011]

§201.66   [Reserved]

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