Day 23 leaves turning yellow? Help

Growing in promix hp with 20 percent perlite. Plant has been growing like crazy but yesterday some leaves started yellowing. The lower fan leaves especially. They are on day 23. Not sure if its overwatering (it's been taking about 4 days for the 5 gallon air pots to dry out). Or nitrogen deficiency? I've been feeding Advances nutriance ph perfect at about 1/4 strength. With a small amount of calmag at the last feed. About 400ppm total. Any ideas? Yellowing with a couple of grayish spots. It is a critical autoflower strain.

Have you ever had a good run with the light that you are using? If you have an old blurple light it might be the problem.

It's my first grow.
the led pulls a true 180 watts. Not sure of its quality yet.

My 2 cents are that you would be better served if you replaced your current light with a better light

Canada4crop said:

Growing in promix hp with 20 percent perlite. Plant has been growing like crazy but yesterday some leaves started yellowing. The lower fan leaves especially. They are on day 23. Not sure if its overwatering (it's been taking about 4 days for the 5 gallon air pots to dry out). Or nitrogen deficiency? I've been feeding Advances nutriance ph perfect at about 1/4 strength. With a small amount of calmag at the last feed. About 400ppm total. Any ideas? Yellowing with a couple of grayish spots. It is a critical autoflower strain.

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It looks like its only a problem with the couple biggest fan leaves. Just pluck those leaves off if it continues to yellow increase nutrients and make sure to let the soil dry out between watering until it starts flowering

Uncle Reefer said:

My 2 cents are that you would be better served if you replaced your current light with a better light

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that's some bad information and is not the reason for is problem. plant looks hungry to me
es lighting can course deficiency but its not the right place to start

Ryante55 said:

It looks like its only a problem with the couple biggest fan leaves. Just pluck those leaves off if it continues to yellow increase nutrients and make sure to let the soil dry out between watering until it starts flowering

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never a real good idea to just pick the yellowing leaves off with out correcting the reason for such a small plant lacking in nutrients as the plant will just start draining the next leaves of its stored nutrients

Canada4crop said:

Growing in promix hp with 20 percent perlite. Plant has been growing like crazy but yesterday some leaves started yellowing. The lower fan leaves especially. They are on day 23. Not sure if its overwatering (it's been taking about 4 days for the 5 gallon air pots to dry out). Or nitrogen deficiency? I've been feeding Advances nutriance ph perfect at about 1/4 strength. With a small amount of calmag at the last feed. About 400ppm total. Any ideas? Yellowing with a couple of grayish spots. It is a critical autoflower strain.

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ive used Advances nutriance ph perfect and i find that stuff to be bad when using it in low strength as it needs to be used at full strength for the ph buffer to work correctly plus that stuff is weak on the nitrogen. your not suffering for a nitrogen deficiency just a lack of nitrogen. are you using the 3 part micro grow and bloom
i suggest moving up to half strength some epson salt will help green it up.
i don't know why you have tip burn if you're only feeding 1/4 strength
explain how you're mixing your 3 part nutrients. it should go water cal mag micro grow them bloom at around 2ml each per liter of water it could be 4 ml per L its been a while since i used that junk

Kipn said:

that's some bad information and is not the reason for is problem. plant looks hungry to me
es lighting can course deficiency but its not the right place to start

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Eh fuck you.

The plant isn't transpiring properly, this is standard what happens with most strains on low power blurple. The stems don't grow, the roots don't take up N and Mag, The plant starts to recycle the stored minerals to the new growth areas. Get more light on the plant and it with improve, or you can fuck around. Chasing your tail, trying to sort out your problems using bro science from haters like Kipn. Honestly, I don't know why I bother.

Uncle Reefer said:

Eh fuck you.

The plant isn't transpiring properly, this is standard what happens with most strains on low power blurple. The stems don't grow, the roots don't take up N and Mag, The plant starts to recycle the stored minerals to the new growth areas. Get more light on the plant and it with improve, or you can fuck around. Chasing your tail, trying to sort out your problems using bro science from haters like Kipn. Honestly, I don't know why I bother.

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you can grow using the shittest lights i know what your trying to say but i disagree that's the problem plus i dont think this user can or will be interested in changing his light
its the nutrients plus its probably not good in a soil apparently promix hp is a soil what has its own ph buffer mixed with the ph buffer in the nutrients things are clashing and odds are this is the problem
Advances nutrient ph perfect will not buffer it self correctly using 1/4 strength the ph will probably end up being 6.6 if not higher