If you are experiencing papery (like wrapping tissue paper but more delicate) leaves under led try this.
WCaP - water soluble cal-phos
Eggshell ground fine, equal volume vinegar (I used apple but white might be better option), 2x volume water.
Before grinding eggshells toast in oven until light brown (iirk more toasted = more avail phos, don't quote me on that, it could be opposite).
Let mixture sit (ferment) 10-20 days in a loosly covered food safe container. Depending on temp, you are waiting for a noticable change in the odor profile.
Stir occasionally. Decant from solids, place solids in compost bin.
Use when ready, don't store, dilute to appropriate ppm, I used 300 ppm total with tap of 180ppm for a soil drench, can be used as foliar but I don't that in flower and don't seem to have this issue in veg. Perhaps train in veg would be better? IDK.
Credit to hyroot and university of haiwaii, this is variant of those recipies.
