Association of American Plant Food Control Officials

Official Publication of Association of American Plant Food Control Officials (AAPFCO), Association of American Plant Pood Control Officials, West Lafayette, Inc., No. 44,1991. 

Association of American Plant Food Control Officials Laboratory Services Committee (2004) Guidelines for Preparing Fertilizer Laboratory and Analytical Samples. Visit website http //www.aapfco.org to obtain a copy. 

Association of American Plant Food Control Officials -http //www.aapfco.org... 

Association of American Plant Food Control Officials. 1994. Official Publication, No. 47. Copies may be purchased from North Carolina Department of Agriculture, 4000 Reedy Creek Road, Raleigh, NC, U.S.A. 

Hoffmeister, G. H. 1982. Particle Size Require-merits for Bulk Blend Materials, TVA Circular Z-146, Paper presented at the 36th annual meeting of the Association of American Plant Food Control Officials, August 3-4, Columbus, OH, U.S.A. 

---