Leaves are turning yellow and dieing. Looks just like nitrogen deficiency but my PH has been running high. Could someone look through my latest entry?

Hi Smeagol, looking at your diary I can see only a gorgeous weed garden. I'm an outdoor grower too and little by little I've learned to don't care about falling of lower/middle canopy expecially if the plants look healthy and with the right tone of green. Looking closely I've noticed some leaves infested by mites. Sometimes lower leaves yellowish and fall because of a combination of factors like age, nutes deficiencies (is not your case), high humidity near the soil and parasites. In any case with senescence bottom leaves will fall anyway. Be relaxed and control the critters around. Cheers Bro