Glossy bluegray plants with hotdog colored petioles are the result of making too much photosynthate and not moving it where it needs to go. I wish nutrient companies would sever their ties with the pesticide industry and sell a 2 part product that will stop confusing growers and ruining plants. Part 1: photosynthesis, part 2:translocation. It would solve all the problems. And that's why it doesn't exist. People are afraid of P and have P deficiency anyway. They cause problems with calcium and attribute it to nitrogen and add more calcium. They get lock out sulfur and add iron to fix it. Whoever taught the grow community in the 80s might have known what they were talking about but it's been completely lost in translation since then.
Nitrogen doesn't burn your tips, it restricts potassium and boron in the tips. But so does
calmag.
Calmag is more popular now since any cannabis grow info has been updated. There's no distinction. The stoner solution back then was to attack the obvious, the deficiency, and not worry whether it's calcium or Nitrate or magnesium that's restricting phosphorus boron manganese zinc etc etc. But today there are apparently zero fertilizers designed to make sense. People are dimming their lights because they make too much photosynthate, and don't move it out of the solar panels fast enough. It's like doing burnouts instead of getting down the drag strip. Cannabis does not need or want to be grown like an ornamental tree. Grow it like a tomatoe vine. All those sugars and acids and vitamins need moved to the fruit. I've been reversing "nitrogen claw" with boric acid for 30 years. It doesn't make sense to worry about the perp and ignore the victim.