Controlled release fertilisers such as Osmocote are used extensively here for the cultivation of succulent plants - species that are often not watered for some months when they are rested. When these plants are in active growth most growers water only about once per week. This merely results in the fertilizer lasting at least twice the usual recommended lifetime.
It is not impossible that some particularly salt sensitive plants may be adversely affected, however, I would like to see any references to published research on this subject.
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Here is a link that might be useful: A new world of information
