for the calcium/magnesium deficiency - curious if anyone has tried using milk or evap milk for a quick calcium injection? i've been "helping" a bud with his grow as much as i could, just to learn, and he had similiar yellow rust spots on one of his plants. He ordered some cal/mag but while it was coming in, he mixed 1 tablespoon of evaporated milk with about 4 ounces of water, poured most of it on the soil (he'd just watered with PH'd and oxygenated water) and then he sprayed some on the leaves. I checked them before i left, about 2 hours after the spraying, and damn if about 70% or more of the yellow spots were gone. Next day, leaves were a dark solid green.
He kinda thinks outside the box, and i kind of liked the idea (+ the results) as the calicum in the milk is already water soluble
fwiw