According to a few websites, even adding 10-10-10 to a compost pile is
"organic gardening", since the fertilizer is not directly added to the
plants. I'm looking more for a technical definition rather than a
philosophical one.

As for algae, sunlight really isnt the limiting factor here. Its
phosphorus. Dump phosphorus into any lake, and a huge algae bloom will take
place. Thats why its not allowed to be used in detergent anymore.