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Midwest Organic & Sustainable Education Service
(MOSES)
Organic Materials Review Institute
(OMRI)
Agricultural Retailers Association
(ARA)
Fluid Fertilizer Foundation
(FFF)
Golf Course Superintendents Association of America
(GCSAA)
The Fertilizer Institute
(TFI)
International Fertilizer Association
(IFA)
Sulfate of Potash Information Board
(SOPIB)
The USDA Crop Nutrient Tool
(NRCS-USDA)
