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Electronic Code of Federal Regulations

e-CFR data is current as of February 14, 2020

Title 7Subtitle BChapter ISubchapter KPart 201 → §201.58


Title 7: Agriculture
PART 201—FEDERAL SEED ACT REGULATIONS


§201.58   Substrata, temperature, duration of test, and certain other specific directions for testing for germination and hard seed.

Specific germination requirements are set forth in table 2 to which the following paragraphs (a), (b), and (c) are applicable.

(a) Definitions and explainations applicable to table 2—(1) Duration of tests. The following deviations are permitted from the specified duration of tests: Any test may be terminated prior to the number of days listed under “Final count” if the miximum germination of the sample has then been determined. The number of days stated for the first count is approximate and a deviatioon of 1 to 3 days is permitted. If at the time of the prescribed test period the seedlings are not sufficiently developed for positive evaluation, it is possible to extend the time of the test period two additional days. (Also, see paragraph (a)(5) of this section and 201.57.)

(2) Light. Cool white fluorescent light shall be provided where light is required in table 2. The light intensity shall be 75 to 125 foot-candles (750-1,250 lux). (The light intensity for nondormant seed and during seedling development may be as low as 25 foot-candles to enable the essential structures to be evaluated with greater certainty.) The seeds shall be illuminated for at least 8 hours every 24 hours except when transferred to a low temperature germinator during the weekend. When seeds are germinated at alternating temperatures they shall be illuminated during high temperature periods. Seeds for which light is prescribed shall be germinated on top of the substratum except for ryegrass fluorescence tests.

(3) Moisture-on-dry-side. This term means that the moistened substratum should be pressed against a dry absorbent surface such as a dry paper towel or blotter to remove excess moisture. The moisture content thus obtained should be maintained throughout the germination test period.

(4) Potassium nitrate (KNO3). These terms mean a two-tenths (0.2) percent solution of potassium nitrate (KNO3) shall be used in moistening the substratum. Such solution is prepared by dissolving 2 grams of KNO3 in 1,000 ml. of distilled water. The grade of the potassium nitrate shall meet A.C.S. specifications.

(5) Prechill. The term “prechill” means a cold, moist treatment applied to seeds to overcome dormancy prior to the germination test. The prechill method varies among kinds, but is usually performed by holding imbibed seeds at a low temperature for a specified period of time. The prechill period is not included in the duration of tests given in table 2, unless otherwise specified.

(6) Predry. The term “predry” means to place the seed in a shallow layer at a temperature of 35° to 40 °C. for a period of 5 to 7 days, with provisions for circulation of the air.

(7) Substrata (Kinds). The symbols used for substrata are:

B = between blotters

TB = top of blotters

T = paper toweling, used either as folded towel tests or as roll towel tests in horizontal or vertical position

S = sand or soil where soil is an artificial planting mix of shredded peat moss, vermiculite, and perlite

TS = top of sand or soil

P = covered Petri dishes: with two layers of blotters; with one layer of absorbent cotton; with five layers of paper toweling; with three thicknesses of filter paper; or with sand or soil

C = creped cellulose paper wadding (0.3-inch thick Kimpak or equivalent) covered with a single thickness of blotter through which holes are punched for the seed that are pressed for about one-half their thickness into the paper wadding

TC = on top of creped cellulose paper without a blotter

RB = blotters with raised covers, prepared by folding up the edges of the blotter to form a good support for the upper fold which serves as a cover, preventing the top from making direct contact with the seeds.

(8) Temperature. A single numeral indicates a constant temperature. Two numerals separated by a dash indicate an alternation of temperature, the test to be held at the first temperature for approximately 16 hours and at the second temperature for approximately 8 hours per day. The temperature shall be determined at the substratum level and shall be as uniform as possible throughout the germination chamber. (A sharp alternation of temperature, such as obtained by hand transfer, may be beneficial in breaking dormancy.) If tests are not subjected to alternating temperatures over weekends and on holidays, they are to be held at the first-mentioned temperature during this time. In cases where two temperatures are indicated (separated by a semicolon) the first temperature shall be regarded as the regular method and the second as an alternate method.

(9) Paper substrata must be free of chemicals toxic to germinating seed and seedling growth. If root injury occurs from toxicity of a paper substratum or from the use of potassium nitrate, retests shall be made on soil or on a substratum moistened with water.

(10) Ethephon. This term means a 29 parts per million (0.0029 percent) solution of ethephon [(2-chloroethyl) phosphonic acid] which shall be used to moisten the substratum. This solution is prepared by mixing 0.6 ml of a stock solution with 5,000 ml of distilled water. The stock solution contains 24 grams of active material per 100 ml of propylene glycol or two pounds of active material per gallon. A solution which is five times this concentration (5 × 29 ppm) may be used for extremely dormant seeds, provided seeds are transferred to substratum moistened with water after 1 to 3 days.

(11) Ethylene. This term means that five (5) ml of ethylene gas per cubic foot (176.57 ml/m3) of germinator space is injected into a germinator in which peanut seeds in moist rolled towels have been placed. Following injection of the ethylene, the germinator is kept closed until the first count (5 days). If the germinator door is opened for the purpose of checking or rewetting the samples, another injection of ethylene at the same rate shall be made.

(b) Special procedures and alternate methods for germination referred to in table 2—(1) Alyceclover; swollen seeds. At the conclusion of the 21-day test period, carefully pierce the seed coat with a sharp instrument and continue the test for 5 additional days. Alternate method: The swollen seeds may be placed at 20 °C for 48 hours and then at 35 °C for 3 additional days.

(2) Bahiagrass; removal of glumes. On all varieties except “Pensacola,” remove the enclosing structures (glumes, lemma, and palea) from the caryopsis with the aid of a sharp scalpel. If the seed is fresh or dormant, lightly scratch the surface of the caryopsis.

(3) Beet, Swiss chard; preparation of seed for test. Before the seeds are placed on the germination substratum, they shall be soaked in water for 2 hours, using at least 250 ml of water per 100 seeds, then washed in running water and the excess water blotted off. The temperature of the soaking and washing water should be no lower than 20 °C. Samples producing excessive discoloration of the hypocotyl or root should be retested in soil or by washing in running water for 3 hours and testing on “Kimpak,” keeping the seed covered with slightly moist blotters. Sugar beets may require 16 hours soaking in water at 25 °C, followed by rinsing and then drying for 2 hours at room temperature.

(4) Buffelgrass; alternate method for dormant seed. The caryopses shall be removed from the fascicles and placed on blotters moistened with a 0.2 percent solution of KNO3, in petri dishes. The seeds from a fascicle should be arranged so they will not be confused with seeds from other fascicles during the test. The seeds are then prechilled at 5 °C for 7 days and tested at 30 °C in light for 21 additional days. Firm ungerminated seeds remaining at the conclusion of the test should be scratched lightly and left in test for 7 additional days.

(5) Cotton (Gossypium spp.); dormant samples. Samples of cottonseed which do not respond to the usual method should be placed in a closed container with water and shaken until the lint is thoroughly wet. The excess moisture should then be blotted off.

(6) Endive (Cichorium endivia); dormant samples. Add about 18 inch of tap water at the beginning of the test and remove excess water after 24 hours.

(7) Green needlegrass; two test methods as prescribed in table 2 shall be used on each sample:

(i) For method 1, acid scarify 400 seeds for 10 minutes in concentrated sulfuric acid (95 to 98 percent H2 SO4). Rinse seeds and dry on blotters for 16 hours, then place seeds on blotters moistened with a solution of 0.055 percent (500 ppm gibberellic acid GA3) and 0.46 percent (3,000 ppm) thiram and germinate 14 days.

(ii) For method 2, plant 400 seeds on blotters moistened with a 0.2 percent solution of KNO3 and germinate 14 days. Refer to §201.57a(c).

(iii) Report the results of method 2 as the percentage germination. If the number in method 2 is less than method 1, subtract the results of method 2 from method 1 and report the difference as dormant seed.

(8) Rescue grass (Bromus catharticus); dormant samples. Wash for 48 hours in running water, or soak for 48 hours, changing the water and rinsing each morning and night.

(9) Rice (Oryza sativa)—Alternate method. Plant the seeds in moist sand. On the seventh day of the test add water to a depth of one-fourth inch above the sand level and leave for the remainder of the test. Only a final count is made. Dormant seeds: Presoak 24 to 48 hours in 40 °C. water. For deeply dormant seeds, presoak 24 hours in 1,000 p.p.m. ethylene chlorohydrin or 5 percent solution of sodium hypochlorite (clorox at bottle strength).

(10) Ryegrass; fluorescence test. The germination test for fluorescence of ryegrass shall be conducted in light [not to exceed 100 foot candles (1,076 lux)] with white filter paper as the substratum. The white filter paper should be nontoxic to the roots of ryegrass and of a texture that will resist penetration of ryegrass roots. Distilled or deionized water shall be used to moisten the filter paper. The test shall be conducted in a manner that will prevent the contact of roots of different seedlings. Roots of some seedlings produce fluorescent lines on white filter paper when viewed under ultraviolet light. First counts shall not be made before the eighth day; at that time remove only normal fluorescent seedlings. Evaluation of fluorescence shall be made under F15T8-BLB or comparable ultraviolet tubes in an area where light from other sources is excluded. If there are over 75 percent normal fluorescent seedlings present at the time of the first count, break the contact of the roots of the nonfluorescent seedlings from the substratum and reread the fluorescence at the time of the final count. At the final count, lift each remaining seedling, observing the path of each root since sometimes faint fluorescence will show on the substratum as the root is lifted. Abnormal seedlings and dead seeds are not evaluated for fluorescence. See §201.58a(a).

(11) Trifolium, Medicago, Melilotus, and Vicia faba; temperature requirements. A temperature of 18 °C. is desirable for Trifolium spp., Medicago spp., Melilotus spp., and Vicia faba.

(12) Garden bean; use of calcium nitrate. If hypocotyl collar rot is observed on seedlings, the sample involved shall be retested using a 0.3 to 0.6 percent solution of calcium nitrate (CaNO3) to moisten the substratum.

(13) Fourwing Saltbush (Atriplex canscens); preparation of seed for test. DE-wing seeds and soak for 2 hours in 3 leters of water after which rince with approximately 3 leters of distilled water. Remove excess water, air dry for 7 days at room temperature, then test for germination as indicated in Table 2.

(c) Procedures for coated seed. (1) Germination tests on coated seed shall be conducted in accordance with methods in paragraphs (a) and (b) of this section. However, kinds for which soaking or washing is specified in paragraph (b) shall not be soaked or washed in the case of coated seed.

(i) Coated seed units shall be placed on the substratum in the condition in which they are received without rinsing, soaking, or any other pretreatment.

(ii) Coated seed units in mixtures which are color coded or can otherwise be separated by kinds shall be germinated as separate kinds without removing the coating material.

(iii) Coated seed units in mixtures which cannot be separated by kinds without removing the coating material shall be de-coated and germinated as separate kinds. The coating material shall be removed in a manner that will not affect the germination capacity of the seeds.

(2) The moisture level of the substratum is important. It may depend on the water-absorbing capacity of the coating material. A retest may be necessary before satisfactory germination of the sample is achieved.

(3) Phytotoxic symptoms may be evident when germinating coated seeds in paper substrata. In such cases a retest in sand or soil may be necessary.

Table 2—Germination Requirements for Indicated Kinds

Name of seedSubstrataTemperature (°C)First count daysFinal count daysAdditional directions
Specific requirementsFresh and dormant seed
AGRICULTURAL SEED
AgrotricumB, T, S20; 1547Prechill at 5 or 10 °C for 5 days.
AlfalfaB, T, S20417See ¶(b)(11)
AlfilariaB, T20-30314Clip seeds
AlycecloverB, T354121See ¶(b)(1) for swollen seeds
Bahiagrass:
Var. PensacolaP, S20-35728Light; see ¶(b)(2)See §201.57a
All other vars.P30-35321Light; remove glumes; see ¶(b)(2)Scratch caryopses; KNO3; see §201.57a
BarleyB, T, S20; 1547Prechill 5 days at 5 or 10 °C or predry
BarrelcloverB, T204114Remove seeds from bur; see ¶(b)(11)
Bean:
AdzukiB, T, S20-304110
FieldB, T, S, TC20-30; 25518
MungB, T, S20-30317
Beet, fieldB, T, S20-30314See ¶(b)(3)
Beet, sugarB, T, S20-30; 20310See ¶(b)(3)
Beggarweed, FloridaB, T305128
Bentgrass:
ColonialP15-30; 10-30; 15-25728Light; KNO3Prechill at 5 or 10 °C for 7 days.
CreepingP15-30; 10-30; 15-25728Light; KNO3Prechill at 5 or 10 °C for 7 days.
VelvetP15-25; 20-30721Light; KNO3
BermudagrassP20-35721Light; KNO3; see ¶(a)(9)
Bermudagrass, giantP20-35721Light; KNO3; see ¶(a)(9)Prechill at 10 °C for 7 days and then test at 20-35 °C; continue tests of hulled seed for 14 days and of unhulled seed for 21 days
Bluegrass:
AnnualP20-30721Light
BulbousP, S101035KNO3 or soilPrechill all samples at 5 °C for 7 days.
CanadaP15-25; 15-301028Light; KNO310-30 °C.
GlaucanthaP15-25; 15-301028Light; KNO3
KentuckyP15-25; 15-301028Light; KNO3Prechill at 10 °C for 5 days.
NevadaP20-30721Light; KNO3
RoughP20-30721Light
TexasP20-30728Light; KNO3Prechill at 5 °C for 2 weeks.
WoodP20-30728Light
BluejointTB, P15-251021Light and KNO3 optionalPrechill at 5 °C for 5 days
Bluestem:
BigP, TS20-30714Light; KNO3Prechill at 5 °C for 2 weeks; see §201.57a.
LittleP, TS20-30714Light; KNO3Prechill at 5 °C for 2 weeks; see §201.57a.
SandP, TS20-30714Light; KNO3Prechill at 5 °C for 2 weeks; see §201.57a.
YellowP, TS20-30514Light; KNO3Prechill at 5 °C for 2 weeks; see §201.57a.
Bottlebrush-squirreltailP, B20; 151014See §201.57a.
Brome:
FieldP, TB15-25; 20-30614LightPrechill at 10 °C for 5 days.
MeadowB, T, TB20-30614Light optional
MountainP20-30614Light.
SmoothP, B, TB20-30614Light optionalPrechill at 5 or 10 °C for 5 days, then test at 30 °C for 9 additional days.
BroomcornB, T, S20-30310
BuckwheatB, T20-3036
Buffalograss:
(Burs)P,TB,TS20-35714Light;KNO3Prechill at 5 °C for 2 weeks; See §201.57a.
(Caryopses)P20-35514Light;KNO3
BuffelgrassS30728Light; press fascicles into well-packed soil and prechill at 5 °C for 7 daysSee ¶(b)(4); see §201.57a.
Burclover, CaliforniaB, T204114Remove seeds from bur; see ¶(b)(11)
Burclover, spottedB, T204114Remove seeds from bur; see ¶(b)(11)
Burnet, littlerB, T15514
ButtoncloverB, T204110See ¶(b)(11)15 °C.
CanarygrassB, T20-3037
Canarygrass, reedP20-30521Light; KNO3
CarpetgrassP20-351021LightKNO3.
CastorbeanT, S20-30714Remove caruncle if mold interferes with test
Chess, softP20-30714LightPrechill at 5 or 10 °C for 7 days.
ChickpeaT,S20-303117
Clover:
AlsikeB, T, S20317See ¶(b)(11)15 °C.
ArrowleafB, T20; 154114See ¶(b)(11)
BerseemB, T, S20317See ¶(b)(11)15 °C.
ClusterB, T204110See ¶(b)(11)15 °C.
CrimsonB, T, S20417See ¶(b)(11)15 °C.
KenyaB, T, S20317
LadinoB, T, S20317See ¶(b)(11)15 °C.
LappaB, T20317See ¶(b)(11)15 °C.
Large hopB, T204114See ¶(b)(11)15 °C.
PersianB, T20317See ¶(b)(11)15 °C.
RedB, T, S20417See ¶(b)(11)15 °C.
RoseB, T204110See ¶(b)(11)15 °C.
Small hopB, T204114See ¶(b)(11)15 °C.
StrawberryB, T20317See ¶(b)(11)15 °C.
SubB, T204114See ¶(b)(11)15 °C.
WhiteB, T, S20317See ¶(b)(11)15 °C.
Corn:
FieldB, T, S, TC20-30; 2547
PopB, T, S, TC20-30; 2547
CottonB, T, S20-30; 304112Test by alternate method; see ¶(b)(5).
CowpeaB, T, S20-30518
CrambeT,B20;2547KNO3
Crested dogtailP20-301021LightPrechill at 5° or 10 °C for 3 days.
Crotalaria:
LanceB, T, S20-304110
ShowyB, T, S20-304110
SlenderleafB, T, S20-304110
StripedB, T, S20-304110
SunnB, T, S20-304110
CrownvetchB,T,TB,S207114
DallisgrassP20-35721Light; KNO3
DichondraB, T20-307128
Drop seed, sandP5-35; 15-35514Light; KNO3Prechill at 5 °C for 4 weeks; see §201.57a.
EmmerB, T, S20; 1547Prechill at 5 or 10 °C for 5 days or predry.
Fescue:
ChewingsP15-25721Light and KNO3 optionalPrechill at 5 or 10 °C for 5 days.
HairP10-251028KNO3
HardP15-25721Light and KNO3 optional
MeadowP15-25; 20-30514Light and KNO3 optional
RedP15-25721Light and KNO3 optional
SheepP15-25721Light and KNO3 optional
TallP15-25; 20-30514Light and KNO3 optionalPrechill at 5 or 10 °C for 5 days and test for 21 days.
FlatpeaT15-25;2014128
FlaxB, T, S20-3037
Foxtail, creepingP15-30721Light;KNO3
Foxtail, meadowP20-30714Light
GalletagrassP, B20; 25; 20-30410See §201.57a
Grama:
BlueP, TB20-30714LightKNO3; see §201.57a.
Side-oatsP15-30714Light; KNO3See §201.57a.
GuarB, T, S30; 20-305114
GuineagrassP15-351028Light; KNO3 optional
HardinggrassP10-30728LightKNO3.
Alternate methodP15-25714Light; presoak at 15 °C for 24 hrs
HempB, T20-3037
Indiangrass, yellowP, TS20-30714Light; KNO3Prechill at 5 °C for 2 weeks; see §201.57a.
Indigo, hairyB, T20-305114
Japanese lawngrassP35-201028Light; KNO3
JohnsongrassP20-35735LightKNO3; see §201.57a.
KenafT, B20-30418
Kochia, forageP20414See §201.57a.
KudzuB, T20-305114
LentilB, T205110
Lespedeza:
KoreanB, T, S20-355114
SericeaB, T, S20-357121
SiberianB, T, S20-357121
StriateB, T, S20-357114
Lovegrass, sandP20-30514Light; KNO3Prechill at 5 or 10 °C for 6 weeks; see §201.57a.
Lovegrass, weepingP20-35514LightKNO3; see §201.57a.
Lupine:
BlueB, T, S204110
WhiteB, T203110
YellowB, T207110
ManilagrassP35-201028Light; KNO3
Medic, blackB, T, S20417See ¶(b)(11)
MilkvetchB, T206114
Alternate methodB, TB, T15-2510121
Millet:
BrowntopB, P, T20-30; 30414Light and KNO3 optionalPredry at 35 or 40 °C for 7 days and test at 30 °C.
Alternate methodB, P, T5-35414Light; KNO3
FoxtailB, T15-30; 20-30410
JapaneseB, T20-30410
PearlB, T20-3037
ProsoB, T20-3037
MolassesgrassP20-30721Light
Mustard:
BlackP20-3037LightKNO3 and prechill at 10 °C for 3 days.
IndiaP20-3037LightPrechill at 10 °C for 7 days and test for 5 days; KNO3.
WhiteP20-3035Light
NapiergrassB, T20-30310
Needlegrass, green:
Method 1P15-30714H2 SO4,GA3 and thiram; dark; see ¶(b)(7)
Method 2P15-30714KNO3; dark; see (b)(7)
OatB, T, S20; 15510Prechill at 5 or 10 °C for 5 days and test for 7 days or predry and test for 10 days.
Oatgrass, tallP20-30614Light
OrchardgrassP, TS15-25721Light; germination more rapid on soilPrechill at 5 or 10 °C for 7 days.
Panicgrass, blueP, TS20-30728Light
Panicgrass, greenP15-351028Light; KNO3 optional
Pea, fieldB, T, S20318
PeanutB, T, S20-30; 255110Remove shellsEthephon or ethylene; see ¶(a) (10) and (11).
Rape:
AnnualB, T20-3037
BirdP20-30310LightKNO3.
TurnipB, T20-3037
WinterB, T20-3037
RedtopP, TB20-30510LightKNO3.
RescuegrassP, S10-30728Light; see ¶(b)(8) for alternate methodIn soil at 15 °C.
RhodesgrassP20-30614Light; KNO3
RiceT, S20-30; 30514See ¶(b)(9) for alternate methodPresoak; see ¶(b)(9).
Ricegrass, IndianP15742Prechill at 5 °C for 4 weeks and test for 21 additional days; see §201.57a.
Alternate methodS5-15; 15; 15-25728Dark; prechill in soil at 5 °C for 4 weeks; see §201.57a.
RoughpeaB, T207114
RyeB, T, S20; 1547Prechill at 5 or 10 °C for 5 days or predry.
Rye, mountainB, T20; 1547See §201.57a.
Ryegrass:
AnnualP, TB15-25514Light optional; see ¶(b)(10) for fluorescence testLight; KNO3; prechill at 5 or 10 °C for 5 days and test at 15-25 °C; if still dormant prechill for 3 days and continue test at 15-25 °C an additional 4 days.
IntermediateP, TB15-25714LightKNO3 and prechill at 5 or 10 °C for 5 days and test at 15-25 °C; if still dormant rechill for 3 days and continue test at 15-25 °C an additional 4 days.
PerennialP, TB15-25514Light optional; see ¶(b)(10) for fluorescence testLight; KNO3; prechill at 5 or 10 °C for 5 days and test at 15-25 °C; if still dormant rechill for 3 days and continue test at 15-25 °C an additional 4 days.
WimmeraP, TB15-25; 20-30514Light optionalLight; KNO3; prechill at 5 or 10 °C for 5 days and test at 15-25 °C; if still dormant rechill for 3 days and continue test at 15-25 °C an additional 4 days.
SafflowerP, B, T, S15; 20414Light at 15 °C
Sagewort, LouisianaP15-25714Light
SainfoinB, T20-304114
Saltbush, fourwingB20514See ¶(b)(13)Prechill at 5 °C for 7 days.
Alternate methodB1521
SesameB, T, TB20-3036
SesbaniaB, T20-30517
SmiloP20-30742LightPrechill at 5 °C for 2 weeks; see §201.57a.
SorghumB, T, S20-30410Prechill grain vars. at 5° or 10 °C for 5 days; test sweet vars. at 30-45 °C, maintaining 45 °C for 2-4 hours per day.
Sorghum almumT, S20-35; 15-35521Prechill at 5 °C for 5 days; on the 10th day of test, clip or pierce the distal end of ungerminated seeds.
Sorghum-sudangrassB, T, S20-30; 25410Prechill at 5 or 10 °C for 5 days.
Sorgrass2B, T, S15-35; 20-35521Prechill at 5 or 10 °C for 7 days.
SourcloverB, T203114See ¶(b)(11)
SoybeanB, T, S, TC20-30; 25518
SpeltB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
SudangrassB, T, S20-30; 15-30410Prechill at 10 °C for 5 days.
SunflowerT,B2047
Sweetclover:
WhiteB, T, S20417See ¶(b)(11)
YellowB, T, S20417See ¶(b)(11)
Sweet vernalgrassP20-30614Light
Sweetvetch, northernB, TB, T15-25; 2014128
SwitchgrassP, TS15-30714Light; KNO3Prechill at 5 °C for 2 weeks; see §201.57a.
TimothyP, TB15-25; 20-30510Light; see ¶(a)(9)KNO3 and prechill at 5 or 10 °C for 5 days.
Timothy, turfP, TB15-25; 20-30510LightKNO3 and prechill at 5 or 10 °C for 5 days.
TobaccoP, TB20-30714Light
Trefoil:
BigB, T205112
BirdsfootB, P, T205112
TriticaleB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
VaseygrassP20-35721LightKNO3.
VeldtgrassP10-30728LightSee §201.57a.
VelvetbeanB, T, S, C20-303114
VelvetgrassP20-30614Light
Vetch:
CommonB, T205110
HairyB, T205114
HungarianB, T205110
MonanthaB, T205110
NarrowleafB, T205114
PurpleB, T205110
WoollypodB, T205114Prechill at 10 °C for 5 days, test at 15 °C.
Wheat:
CommonB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
ClubB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
DurumB, T, S20; 15410Prechill at 5 or 10 °C for 5 days, or predry.
PolishB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
PoulardB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
Wheat AgrotricumB, T, S20; 1547Prechill at 5 or 10 °C for 5 days, or predry.
Wheatgrass:
BeardlessP, TB15-25714Light and KNO3 optionalKNO3 and prechill at 5 or 10 °C for 7 days.
Fairway crestedP, TB15-25; 20-30514Light and KNO3 optionalKNO3 and prechill at 5 or 10 °C for 7 days.
Standard crestedP, TB15-25; 20-30514Light and KNO3 optionalKNO3 and prechill at 5 or 10 °C for 7 days.
IntermediateP15-25528Light and KNO3 optionalKNO3 and prechill at 5 or 10 °C for 7 days.
Alternate methodP20-30528Light
PubescentP15-25528Light and KNO3 optionalKNO3 and prechill at 5 or 10 °C for 7 days.
Alternate methodP20-30528Light
SiberianP, TB15-25714Light and KNO3 optionalKNO3 and prechill at 5 or 10 °C for 7 days.
SlenderP, TB15-25; 10-30514Light and KNO3 optionalPrechill at 5 or 10 °C for 5 days; if still dormant on the 10th day, rechill 2 days, then place at 20-30 °C for 4 days.
StreambankP, TB15-25514Light and KNO3 optionalPrechill at 5 or 10 °C for 5 days.
TallP15-25521Light and KNO3 optionalPrechill at 5 or 10 °C for 5 days.
Alternate methodP20-30521LightPrechill at 5 or 10 °C for 5 days.
WesternB, P, T15-30728DarkKNO3 or soil; see §201.57a.
Wildrye:
BasinP15-251021See §201.57a.
CanadaP15-30721LightPrechill at 5 °C for 2 weeks.
RussianP20-30514LightPrechill at 5 or 10 °C for 5 days.
VEGETABLE SEED
ArtichokeB, T20-30721
AsparagusB, T, S20-30721
AsparagusbeanB, T, S20-30518
Bean:
GardenB, T, S, TC20-30; 25None18See ¶(b)(12).
LimaB, T, C, S20-30519
RunnerB, T, S20-30519
BeetB, T, S20-30314See ¶(b)(3)
BroadbeanS, C204114See ¶(b)(11)Prechill at 10 °C for 3 days.
BroccoliB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light.
Brussels sproutsB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light
Burdock, greatB, T20-30714
CabbageB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light.
Cabbage, ChineseB, T20-3037
Cabbage, tronchudaB, P20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light.
CardoonB, T20-30721
CarrotB, T20-30614
CauliflowerB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light
CeleriacP5-25; 201021Light; see ¶(a)(9)
CeleryP15-25; 201021Light; see ¶(a)(9)
Chard, SwissB, T, S20-30314See ¶(b)(3)
ChicoryP, TS20-30514Light; KNO3 or soil; see ¶(a)(9)
ChivesB, T20614
CitronB, T20-30714Soak seeds 6 hrsTest at 30 °C.
CollardsB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light .
Corn, sweetB, T, S, TC20-30; 2547
CornsaladB, T15728Test at 10 °C.
CowpeaB, T, S20-30518
Cress:
GardenB, P, T15410Light.
UplandP, TB20-3547Light; KNO3
WaterP20-30414Light
CucumberB, T, S20-3037Keep substratum on dry side; see ¶(a)(3)
DandelionP, TB20-30721Light; see ¶(a)(9)
DillB, T20-30721
EggplantP, TB, RB, T20-30714Light; KNO3.
EndiveP, TS20-30514Light; KNO3 or soilSee ¶(b)(6).
Gherkin, West IndiaB, T, S20-3037Test at 30 °C.
KaleB, P, T20-30310Prechill at 5° or 10 °C for 3 days; KNO3 and light.
Kale, ChineseB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light.
Kale, SiberianB, P, T20-30; 2037
KohlrabiB, P, T20-30310Prechill at 5 or 10 °C for 3 days; KNO3 and light.
LeekB, T20614
LettuceP20None7LightPrechill at 10 °C for 3 days or test at 15 °C.
MelonB, T, S20-30410Keep substratum on dry side; see ¶(a)(3)
Mustard, IndiaP20-3037LightPrechill at 10 °C for 7 days and test for 5 additional days; KNO3.
Mustard, spinachB, T20-3037
OkraB, T20-304114
OnionB, T20610
Alternate methodS20612
Onion, WelshB, T20610
Pak-choiB, T20-3037
ParsleyB, T, TS20-301128
ParsnipB, T, TS20-30628
PeaB, T,S20518
PepperTB, RB, T20-30614Light and KNO3.
PumpkinB, T, S20-3047Keep substratum on dry side; see ¶(a)(3)
RadishB, T2046
RhubarbTB, TS20-30721Light
RutabagaB, T20-30314
SageB, T, S20-30514
SalsifyB, T15510Prechill at 10 °C for 3 days.
Savory, summerB, T20-30521
SorrelP, TB, TS20-30314LightTest at 15 °C.
SoybeanB, T, S, TC20-30; 25518
SpinachTB, T15;10721Keep substratum on dry side; see ¶(a)(3)
Spinach, New ZealandT15; 20521Soak fruits overnight (16 hrs), air dry 7 hrs; plant in very wet towels; do not rewater unless later counts exhibit drying outOn 21st day scrape fruits and test for 7 additional days.
Alternate methodB, T15521Remove pulp from basal end of fruit
SquashB, T, S20-3047Keep substratum on dry side; see ¶(a)(3)
TomatoB, P, RB, T20-30514Light; KNO3.
Tomato, huskP, TB20-30728Light; KNO3
TurnipB, T20-3037
WatermelonB, T, S20-30; 25414Keep substratum on dry side; see ¶(a)(3)Test at 30 °C.

1Hard seeds may be present. (See §201.57)

2Rhizomatous derivatives of a johnsongrass sorghum cross or a johnsongrass sudangrass cross.

[20 FR 7928, Oct. 21, 1955]

Editorial Note: For Federal Register citations affecting §201.58, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.govinfo.gov.

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