Patent ID: 6312493
Filing Date: 2001-11-06
Classification: C05D,C05F,C05G

Abstract:
A water soluble, solid fertilizer for producing a stable, essentially precipitate free fertilizer composition solution comprising:at least one phosphorus free organic acid which is solid at ambient temperature and has a water solubility of at least 10 grams/liter (at 25.degree. C.), the acid having an acidifying effect in the range of 0.5 to 1.3 g HCO.sub.3.sup.- /grams acid, the acidifying effect being defined as the amount of HCO.sub.3.sup.- that can be transformed into H.sub.2 CO.sub.3 per gram of said acid, which amount is calculated employing the following formula: ##EQU7##wherein M.sub.w,acid is the molecular weight of said acid and n represents the number of dissociation constants of the acid below a pKa value of 6.35,the acid being present in an amount sufficient to reduce the HCO.sub.3.sup.- level in water by between about 60-400 parts per million when the composition is applied to water at a dosage of 1 gram per liter of water enabling formation of a stable, essentially precipitate free aqueous fertilizer solution, the amount of acid being measured by the formula: ##EQU8##wherein Ac.sub.product corresponds with the overall acidifying effect of a fertilizer product in parts per million HCO.sub.3.sup.- at a dosage of 1 gram of water soluble fertilizer per liter of water; 61 is the molecular weight of bicarbonate or HCO.sub.3.sup.- in grams/mole; n represents the number of dissociation constants of the acid below a pKa value of 6.35; M.sub.w,acid i is the molecular weight of the acid and is expressed in grams/mole; f.sub.acid i is the (dimensionless) weight fraction of the acid in the fertilizer composition; m is the number of acids in a product and 1000 is the conversion factor for converting grams into milligrams or parts per million; andat least one fertilizer material selected from the group consisting of phosphorus, nitrogen and potassium containing primary macro nutrients; non-chelated secondary macro nutrients; non-chelated micro nutrients; and mixtures thereof; wherein the phosphorus containing primary macro nutrients are in the form of phosphates.