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AOAC RESEARCH INSTITUTE  Expert Review Panel Chair Report for Fertilizers  Page 3 of 4 

EXPERT REVIEW PANEL, METHOD BACKGROUND, AND CONCLUSIONS 

Criteria for Vetting Methods to be considered: AOAC convened the  Official Methods of Analysis SM  (OMA) Expert Review Panel for Fertilizers for Slow and  Controlled Release that was held on Wednesday, December 6, 2017 from 10:00am EST to 12:00pm EST via  GoToMeeting and audio teleconference.  The purpose of the meeting was to review and evaluate AOAC Official Method 2015.15 Nitrogen, Phosphorus, and  Potassium Release Rates of Slow‐and Controlled‐Release Fertilizers, First Action 2015  (original study director,  William Hall, Mosaic, 13830 Circa Crossing Drive, Lithia, Florida 33547) for recommendation for AOAC Final Action  Official Methods status.    AOAC Official Method 2015.15 was reviewed and supplemental information was also provided to the reviewers  which included a copy of the OMA method, Article: Determination of Nitrogen, Phosphorus, and Potassium  Release Rates of Slow‐ and Controlled‐Release Fertilizers: Single‐Laboratory Validation, First Action 2015.15 , and  the AOAC Expert Review Panel Chair Report of September 2015. Criteria for Vetting Experts and Selection Process: The original twenty‐five (25) candidates are being submitted for consideration by the Official Methods Board to  evaluate candidate methods for Fertilizers which include the subject matter areas of Metals, Nitrogen (slow  release), Phosphorus & Potassium, Total Sulfur, and Urea as per the Expert Review Panel (ERP) Policies and  Procedures. The candidates were highly recommended by the Agricultural Materials Community, the Association  of American Feed and Control Officials (AAFCO), the Association of Fertilizer and Phosphate Chemists (AFPC) and  other subject matter experts. Many of the following candidates have participated in various AOAC activities,  including but limited to, Method Centric Committees that were formed under the legacy OMA pathway.  The  following members were present to review methods: William Hall, James Bartos, Elizabeth Guertal, Jon Hartshorn,    Michael Hojjatie, Salvatore Parisi, Krishnamurthy Nacharaju, and Raj Nagarajun. ERP Orientation: All ERP members have completed the mandatory AOAC Expert Review Panel Orientation Webinar.   Expert Review Panel Meeting Quorum The meeting of the Expert Review Panel was held in person. A quorum is the presence of seven (7) members or 2/3  of the total vetted ERP, whichever is greater. Eight (8) out of the eight (8) members were present and therefore met  a quorum to conduct the meeting.    Conclusion: The Expert Review Panel recommended a continuance of 2‐years for AOAC Official Method 2015.15.  The decisions  have been captured and reflected in the meeting minutes.   Subsequent ERP Activities: ERP members are required to continue to track the performance of AOAC Official Method 2015.15 for a period of 2  years effective as of December 6, 2017. An action item for AOAC staff to engage the AOAC Committee on Statistics  to draft study plan and specific questions.  Standard Method Performance Requirements (SMPRs):  N/A 

03/12/2018