Thanks, Arlyn. I have the article bookmarked to re-read. Lots of information.
Puzzled by one statement - cautioning not to water in the daytime because it causes rot. Who waters at night? Hmmmm....
Also, while it looks like Super Phos is obtained from rock, I wonder about some of the other suggestions. Also, Tom's comment
about a it being banned in his area because it's getting in the ground water gives me pause.
