Please help, Leaves turning yellow, damaged and dying

This problem is spreading rather rapidly and is effecting mainly the lower fan leaves. These are white widow, last feed was about 4 days ago using fox farm grow big and big bloom, following exact dosage requirement.




Looks like its killing the leaves so I want to stop this before it kills the plant, suggestions?

looks like you spilled shit on em to,and one looks nute burnt,when do you feed? lights? temps? what soil? do you Ph ur water ? if ph is out of wack some nutes get locked out. I am running fox farm gear and i only had a cal mag issue at week 5 i want to say

I feed once a week, light is a 600w MH but was a 600w HPS until 2 days ago, do I use well water so it should be near neutral. Im about to head to the store to buy some ph testing materials. Yeah im at like week 6-7

Sup bro it lookz like you have a slight magnesium problem i dont know how old you plantz are but they look to small to be onvfullvstrenth nutes drop it to half strenth.....and check out the guide to plant deffecieny/toxicity im plant problems section your awnser is deffenitaly there

you will need Ph up and down. Ebay has cheep tested for around 20 bucks and while ur at it get a ppm meter to to see how shitty or good ur water is ....very shocked you made it this far with out testing, when you get a tester i would resomend a good flush with 1/4 nutes, and a touch of epsim salt for a lil bost. someone esle may say something diffrent, but as of now you are in the dark for as nute intake with out Ph ing the water.....Peace

I'll second the opinion that they are way too young for full strength nutes. 1/4 strength at that age should be sufficiant. The foxfarm soil should easily have what it needs to feed the young plants for 3 to 4 weeks without adding much of anything at all.
Usually by the time the soil is being depleated, the plants need transplanted into bigger pots anyway, which gives it a charge of nute rich soil. I usually do not use full strength nutes until they are in their final size pot and have been in there for a couple of weeks.

Ph is 6.0 looks likeish, and I was doing full nutes so ill do plain water for a little bit