No idea of the alkaloid content, but I have a clone too, working on exponential division. It's really hard to find any specific info about it, so I think it's more so in the domain of first-time experimenters.
Johnny Appleseed reported in an Entheogen Review article that about a pound of dry grass should be a dose, though I'm guessing that could be halved for purposes of bioassaying the potency. I really wish somebody could supply the entire interview with J. Appleseed, it might have some really useful info.
See Vodsel's post:
Welcome to the DMT-Nexus
Since
drying Phalaris tends to reduce the amount of alkaloids, one should be able to use a smaller sample of fresh grass, assuming that your extract can handle the extra water weight.
Big Medicine would seem to be a more ideal source for Phalarihuasca because it lacks gramine (which may be metabolized by MAO-A, which would obviously be inhibited in this situation). It has been shown in the Phalaris Analysis Thread to contain hordenine, but that
should be metabolized by MAO-B. Harmala alkaloids shouldn't affect MAO-B in the doses needed for MAO-A inhibition, as far as I can tell.
Plus, hordenine has been used as a supplement in the 500mg-1g range anyway.
Cautious experimentation seems warranted.
I'd also like to find a high 5-MeO producing strain as well, since the dose would be maybe 1/5 of that of DMT-phalaris, and shouldn't even need a MAOI!