shredGnar
Member
Looks like a calcium shortage with the burnt tips and the spots. Also see some K or burning issues I think.
If you don't have enough calcium you are going to run problems with K uptake (and mobility of nutrients in general).
Liebig's law of the minimum says growth is controlled by the least abundant resource. Consider what effect that might have if one of your nutrients is out of range. If growth speed is controlled by the scarcest variable, that means the nutrients that you supplied in abundance will probably build up.
As far as plants drooping.. I'd guess if your roots are nice it also has to do with the nutrients. If there is more sunlight than they can process, they droop their leaves to conserve energy.
Cal/mag are the first nutes to get locked out when the plants are under oxygenated, in my experience