Growth targetting fertilization/staged fertilization programs
So I've been running slightly higher PO4 (1:6 P:N rather than 1:10) and started to wonder has anyone tried manipulating fert ratios/lighting spectrum to target specific types of growth and developing a staged fertilization system? What I mean by this isn't creating a limiting situation, but having all in excess but manipulating the ratios. A few examples I've thought of:
increasing P:N to encourage root and rhizome growth
increasing K:N and shifting to a redder spectrum to encourage flowering
increasing N+Mg to drive vegetative growth
playing with temperature to see the effects of temperature on red foilage
If so, what ratios were used and how well did it work? What were the drawbacks? What plants were used?
If not, anyone with a couple spare tanks willing to experiment? I'm still getting the hang of basic fertilization in an aquarium but once I do I plan to run some experiments myself.