CPC C05G 5/36 (2020.02) [C05B 7/00 (2013.01); C05B 17/00 (2013.01); C05B 19/00 (2013.01); C05C 1/00 (2013.01); C05C 9/005 (2013.01); C05D 1/02 (2013.01); C05D 9/00 (2013.01); C05D 9/02 (2013.01); C05G 3/44 (2020.02); B01J 2/003 (2013.01); B01J 2/12 (2013.01)] | 27 Claims |
1. A granulated fertilizer product comprising:
a plurality of acidified fertilizer granules including a plurality of base granules, each base granule containing a macronutrient source and a source of zinc incorporated into the macronutrient source, wherein the macronutrient source comprises a phosphate containing fertilizer,
wherein each base fertilizer granule is acidified by direct application of liquid sulfuric acid to only an outer surface of the base fertilizer granule in an amount to increase zinc solubility thereby increasing availability of zinc for plant uptake.
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12. A method for increasing zinc solubility and consequently availability in fertilizer granules, comprising:
providing a granular fertilizer product comprising a plurality of base fertilizer granules, each base fertilizer granule formed of a macronutrient source and a source of zinc incorporated into the base fertilizer granule; and
applying liquid sulfuric acid directly to only an outer surface of the macronutrient source of the base fertilizer granules in an amount to increase zinc solubility thereby increasing availability of zinc for plant uptake.
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