dying yellow leaves a month into flower...could really use your advice. thanks!

Hello All

aprox 1 and a half weeks into flower my fan leaves started to turn lime green/yellow and eventually die. I'm three weeks in and the problem has progressed.

2 600 watt hps
3 wks into flower
Liquid Karma, Probloom, silica blast.... Full dose of liquid karma per watering, around half dose of bloom per watering, half does of silica blast
3 gallon grow bags
fox farm ocean forest
Tap water left out for a couple days
I add nutes, use PH down, and usually end up with a ph of around 6.0-7.0 before I water

77 degrees
30% humidity

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I don't think it's a nitrogen issue because the yellowing is universal and doesn't start at the bottom.
I would think its maybe a magnesium issue but the leaves don't have the stereotypical green veins and purple stems. (although the stems of the fan leaves are purple but not the stalk)

Maybe is is magnesium and my tap doesn't have enough cal-mag?
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check soil real close ly for bugs

no bugs as far as I can see

My first step would be to see if it responds to a foliar feed.but I'm slow.

This problem that reduces final weight is caused by pot too small, under watering(moisture stress) or ph wrong s/b 6.5.

foliar feeding them with what though? I don't know whether to feed them epsom salts or a dose of veg nutes

my last round I grew a five footer in a 3 gallon pot and it turned out great. This problems is also happening to some of my smaller plants as well. I suppose it may be ph because I use those drops and they probably aren't the best ph readers

Give some vege nutes, nitrogen with your bloom for first few weeks of bloom. Start at half strength vege and bloom first week and then next week 1/4 strength and 3/4 bloom ect.. your plant still needs nitrogen in early bloom. Also get your ph down to 5.8 this will help a lot.

yeah, I think that may be the problem because I switched over the bloom nutes immediately after switching to 12/12. 5.8 PH is good for hydro right? I'm in soil.

5.8 is best for hydro. 6.0 to 6.5 usualy called for in soil but even in soil i go 5.8 always seemed plants thrived better at that. I think it maximizes nute uptake. I only use coco and perlite now with no ph issues.

6.0 to 7.0 for soil.
6.5 is optimal

indeed. So what do you think the problems is ring? nitrogen?

It looks like a K deficiency to me. Foliar feed a N 1.0 K 1.0 P 1.0 and then correct soil PH. You want to foliar feed with the lights off ASAP. Yellowing works it's way fast, foliar feeding stops it from progresssing. Use Technaflora Thrive alive B1 or use H&G Magic Green or something similar.

I think you're probably right about the k deficiency. I'm thinking I'll flush with a light nute solution? I read that you're not supposed to foliar feed during a k deficiency?

awe...just spray one leaf and wait overnight for the reaction.

i had similar issue friend told me check soil for tiny bugs didnt see any bugs at first yellow @28 days flower then on day 34 i check bottom trays and bam there they are

check your run off ec and ph and you hummidity is a bit low i go around 40-60 at 30 the ec will be rising in your medium

My runoff Ph is fine as well as the humidity for flowering...no bugs...I flushed one of the plants and it's only gotten worse...As far as i can tell I'm doing everything by the book...still remains a mystery

before u go dosing ur plants with more nutes check the soil ph FIRST. ocean forest is ph is very low. everything the plants need may be there just locked up because of ph problems

Was that a mom that you flowered out or something? Its an odd shape..like I see the trunk off to the side and then little branches arching over. Anyways,have you grown that strain before? If you havent,its a possibility its just bad genetics. Ive tried out strains before that just didnt respond well to anything and always looked deficient (along side perfectly healthy plants under the same care). Sounds like youre being attentive and doing everything correctly. Only other thing I could think of is maybe it was a bad batch of fox farm and your getting some sort of root disease thats preventing uptake..cause on top of the yellowing the leaves look kind of stunted too.