re: sugar water...
I guess the big question is what would sugar water do to the plants? I would also expect a huge increase in bacteria or molds (perhaps harmless, perhaps not.)
Also, it would take a HELL of a lot of sugar to saturate to the deep root system. If you are spending more on sugar than you are getting out of selling oranges, I'm not sure there's a point. I wonder if there are any chemical or food processing procedures that result in waste sugars that are not sucrose, fructose, or other useful types? Would these work? I am now officially over my head as far as this subject is concerned.