Abstract
Abstract An investigation of a major difference in a special sample showed the reason for the potassium value differences in many routine fertilizer samples. Lower K2O values by AOAC official carbonate extraction method 2.079(a) as compared with AOAC official oxalate extraction method 2.070(a) were found consistently for 17 typical mixed fertilizer samples investigated. An average lower absolute difference of 0.4% K2O was found on the typical mixed fertilizers by carbonate extraction. Studies show that this difference is associated with the impurities in fertilizer grade phosphate raw materials, particularly the varying solubility of the (Fe,Al) (NH4,K,H) phosphates.
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