Method for the manufacture of slow release fertilizers

Details Method for the manufacture of slow release fertilizers Method for the manufacture of slow release fertilizers

1987-12-17

1990-06-26

Silbaugh, Jan H.

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 6407, 71 6411, 71 6413, 264117, 427212, A01N 2526

Patent

active

049368974

ABSTRACT:
A method for the manufacture of physically prepared slow-release fertilizer by coating fertilizer particles with at least one layer of a substantially water insoluble metal salt formed in-situ from an organic acid having between 6 and 30 carbon atoms and a metal oxide or carbonate. Optionally, the coating layer contains micronutrients and inert materials. In a preferred embodiment, an additional layer of paraffin is added on the coating of metal salt of organic acid. The method is applicable for most of the known fertilizers. The method enables to vary the rate of fertilizer release and the release period time according to specific requirements.

REFERENCES:
patent: 3096171 (1963-07-01), Woerther
patent: 3158462 (1964-11-01), Wilson
patent: 3223518 (1965-12-01), Hansen
patent: 3232740 (1966-02-01), Sor et al.
patent: 3242237 (1966-03-01), Belak et al.
patent: 3259482 (1966-07-01), Hansen
patent: 3306730 (1967-02-01), Malmberg
patent: 3321298 (1967-05-01), Bidlak et al.
patent: 3697245 (1972-10-01), Dilday

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