Controlled release fertilizer

Details Controlled release fertilizer Controlled release fertilizer

1974-10-04

1977-05-17

Spear, Jr., Frank A.

Chemistry: fertilizers

Processes and products

Forms or conditioning

71 28, 427214, C05C 900

Patent

active

040239551

ABSTRACT:
A solid controlled release fertilizer of a discrete particle of a fertilizer material encapsulated within a coating of partially hydrated cement is provided. In a preferred embodiment, the partially hydrated cement coated fertilizer particle is encapsulated within a thin semipermeable elastomer coating. In another embodiment, the thin semipermeable elastomer is in turn encapsulated within a second partially hydrated cement coating which contains micronutrient trace elements.

REFERENCES:
patent: 2806773 (1957-09-01), Pole
patent: 3192031 (1965-06-01), Zaayenga
patent: 3400011 (1968-09-01), Fox
patent: 3630713 (1971-12-01), Adams
patent: 3660070 (1972-05-01), Maruta et al.

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