Special procedures for purity analysis.

CFR · 2024-01-01 · US · Title 7

(a) The laboratory analyst shall use the Uniform Blowing Procedure described in this paragraph to separate pure seed and inert matter in the following: Kentucky bluegrass, Canada bluegrass, rough bluegrass, Pensacola variety of bahiagrass, orchardgrass, blue grama, and side-oats grama. (1) (2) (3) (i) Refer to the specifications on the calibration samples for Kentucky bluegrass, orchardgrass, and Pensacola variety of bahiagrass to determine their appropriate blowing points for the Uniform Blowing Procedure. (ii) Use the calibration sample for Kentucky bluegrass to determine the blowing points for Canada bluegrass, rough bluegrass, blue grama, and side-oats grama. (A) The blowing point for Canada bluegrass shall be the same as the blowing point determined for Kentucky bluegrass. (B) The blowing point for rough bluegrass shall be a factor of 0.82 (82 percent) of the blowing point determined for Kentucky bluegrass. The 0.82 factor is restricted to the General-type seed blower. (C) The blowing point for blue grama shall be a factor of 1.157 of the blowing point determined for Kentucky bluegrass. Before blowing, extraneous material that will interfere with the blowing process shall be removed. The sample to be blown shall be divided into four approximately equal parts and each blown separately. The 1.157 factor is restricted to the General-type seed blower. (D) The blowing point for side-oats grama shall be a factor of 1.480 of the blowing point determined for Kentucky bluegrass.

official document · source cfr-2024 · id 7:§ 201.51a