Please help! Yellowing leaves, burning on tips and its getting worse, with pic.

[kpro]

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this is whats happening... and this is one out of 4 plants that this has happened to. The others are fine. All of them are in potting soil.
Im in my 2-3rd week of flowering. The lower leaves were doing this at first, and its quickly moving up each stem. Today there was about 20-30 new leaves affected. I put some bloom booster in the pot on thursday because I just figured they were a little nitrogen defficient since its been awhile since I've added nutes, and it got worse today. They get 12-13 hours full sun. Let me know if you have any info to help me. This pic is one I found, but it looks identical. They are also turning brown and curling up on the tips. I've seen a little bit of white residue on some of the severly messed up leaves.

 

[EnjoyIt]

Tough to say without actuall pics of yours. Could be heat stress, N def, P def, pH problem causing a lockout of some sort. Whats the ph of your water coming out the bottom of your pots? Whats the temps outside? How much/ how often are you feeding? But since you said it started from the bottom and workin its way up im gonna say a nute def of some sort. Most likey you need to feed them. But check your pH first and go from there.

 

[kpro]

Thanks. Temps have been in the upper 80's to mid 90's for almost a month and a half. I put miracle grow bloom booster in at half strength 4 days ago. I don't know how to test the ph, other than with pool test strips I have for my pool. I will test it and report back. My leaves look EXACTLY like that. purple up thru the center, marbled green and yellow.

 

[Xiphos]

I put some bloom booster in the pot on thursday because I just figured they were a little nitrogen defficient since its been awhile since I've added nutes, and it got worse today.

You added more potassium and phosphorous with bloom.. but they need nitrogen bro