Fertilizer solutions stabilized with inorganic acids
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United States of America Patent
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Jun 22, 1982
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N/A
app pub date -
Jun 10, 1980
filing date -
Jun 10, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A stable liquid fertilizer solution containing nitrogen, phosphorus, iron and optionally sulfur is prepared by mixing a water-soluble iron compound with ammonium polyphosphate and water to produce an iron phosphate slurry having a molar ratio of polyphosphate phosphorus to iron of at least about 2:1, adding ammonia to the iron phosphate slurry to produce a solubilized iron complex; and adding an inorganic acid to the iron complex solution. The amount of acid added is generally that which brings the pH of the fertilizer solution to within the range of about 5.5 to 7.0.
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