Controlled release potassium divalent metal phosphate fertilizer

Details Controlled release potassium divalent metal phosphate fertilizer Controlled release potassium divalent metal phosphate fertilizer

1993-05-19

1994-12-20

Lander, Ferris

Chemistry: fertilizers

Processes and products

Inorganic material

71 46, 71 51, 423306, C01B 2545, C05B 900

Patent

active

053742940

ABSTRACT:
A controlled slow release potassium divalent metal phosphate composition for agriculture and an effective method of preparing the composition. 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 one growing season without damage to plant foliage or roots. Divalent metals effectively forming the new composition include magnesium, manganese, zinc, iron, cobalt, and copper. The effective method of preparing the new composition requires the exothermic coreaction 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.degree. and 150.degree. C., until damp dry, particulate, water insoluble potassium divalent metal phosphate is formed.

REFERENCES:
patent: 3285731 (1966-11-01), Salutsky et al.
patent: 3585020 (1971-06-01), Legal et al.
patent: 4217333 (1980-08-01), Loblich et al.
patent: 5035872 (1991-07-01), Loblich et al.
Bassett and Bedwell, "Studies of Phosphates-I", Journ. Chem. Soc. (London) 1933, pp. 854-871.
Rothbaum, New Zealand Journ. of Science, 1973, pp. 539-552.

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