makes things so much easy ya know what you are feeding and can test whats comeing out,yellowing leafs bleaching lack of nutes,also hit them with a nute like pk 13/14 its time dude,and sit back and watch them go boom,pick a cheap ec pen up of e bay.
I would water and allow to dry out i mean dry out water with your normal nute regiment and the pk spike pk 13/14 best i have found or over drive,but only for two waters thats if the plants take 2 waters a week if not just use for a few waters but no more than 3 waters i use it for two days ,but my grows are hydroponic auto pot set up and they are drinking 18 ltr every day that's 3 plants.
In soil all my best results come from water allow to dry then repeat never water every day just end up with root rot or root burn,the plants like that time been totally dry for a few hour,in future put a air ring in the bottom of the pots then have a fish tank pump pumping air to the roots via the air ring.works a treat
hope this helps tyke