Okla. Stat. tit. 2, § 2-8-77.9: Sampling - Analysis

A. The methods of sampling and analysis shall be those adopted

by the Association of Official Analytical Chemists. In cases not

covered by these methods, or in cases where methods are available in

which improved applicability has been demonstrated, the State Board

of Agriculture may adopt appropriate methods from other sources.

B. The Board, in determining for administrative purposes,

whether any fertilizer is deficient in plant food, shall be guided

solely by the official sample as defined in Section 8-77.3 of Title

2 of the Oklahoma Statutes and obtained and analyzed as provided for

in subsection A of this section.

C. Official samples establishing a penalty for nutrient

deficiency shall be retained for a minimum of ninety (90) days from

issuance of a deficiency report.