AOAC RI ERP EBOOK FOR FERTILIZERS

AOAC RESEARCH INSTITUTE AOAC OFFICIAL METHODS OF ANALYSIS (OMA)

OMAMAN-28/AOAC 2006.03 Study Director: Sharon Webb, University of Kentucky, Division of Regulatory Services, 103 Regulatory Services Bldg, Lexington , Kentucky 40546-0275

which may decrease the final reading.

ER 4 ER 5 ER 6 ER 7 ER 8 ER 9

Yes Yes Yes Yes Yes Yes

ER 10 Yes Is sufficient information included for system suitability determination and product performance or acceptance testing? ER 1 Yes ER 2 Yes ER 3 Yes ER 4 Yes ER 5 Yes ER 6 Yes ER 7 Yes ER 8 Yes ER 9 Yes ER 10 Yes Are the conclusions statements valid based upon data presented? ER 1 Yes ER 2 Yes ER 3 No, Not suitable for nutrients/metals that are increased in availability under alkali conditions or ones that may complex with other fertilizer constituents during extractant wait time. ER 4 Yes ER 5 Yes ER 6 Yes ER 7 Yes ER 8 Yes ER 9 Yes ER 10 Yes Do you agree that the evidence or data from this and previous studies support the proposed applicability statement? ER 1 Yes ER 2 Yes ER 3 No, In addition to the items mentioned in #1 above, the purpose of a fertilizer test should be to determine the availability of any given metal/nutrient for plant uptake once applied to the soil. This method provides no such proof of it correlating in any way with plant uptake. Also, the Page 2 of 14