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NPK in not a composition. However fertilizer applications are relatively dilute compared to the mass of soil to which they are applied , so it is difficult to imagine a problem. Generally not a problem for a home owner depending on the exact levels and compositions of the NPK, but the mixed fertilizers can interact. I remember once getting a weak ammonia ...


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I had a Clementine seedling for years that always dropped most of its leaves every time I brought it outdoors and then again every time I brought it indoors. It was light-related: the tree didn't like going from a mostly indirect-lighted location to a mostly sunny location and vice versa. I got rid of the problem by keeping the Clementine in a mostly shaded ...


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