Controlled released potassium divalent metal phosphate fertilizer
1997
Moore, W.P.
A controlled slow release potassium divalent metal phosphate composition for agriculture and an effective method of preparing the composition is presented. The cold water insolubilities of each of the contained nutrients are between 35 and 98 percent. The potassium exhibits an Activity Index between 20 and 85. The release of all contained nutrients is substantially complete in off growing season without damage to plant foliage or roots. Divalent metals effectively forming the new composition requires the exothermic core action of concentrated potassium hydroxide, divalent metal oxide powder, and concentrated phosphoric acid, with a molecular ratio of 1 potassium/1 divalent metal/1 phosphate with the total water content of the initial reaction mixture between 20 and 50 percent, at a maximum temperature between 85 and 150 deg C, undamp dry, particulate, water insoluble potassium divalent metal phosphate is formed
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