Yellowing and curled leaves!!

What's my issue?

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Greg Seitter

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IMG_7737.JPG IMG_7736.JPG IMG_7733.JPG IMG_7732.JPG IMG_7735.JPG I'm not sure what I'm doing wrong because there's about 20 different things out there that I've read that all seem to point to the same symptoms. I'm having rapid yellowing and death of big fan leaves as well as other small ones that curl upwards at the tips. I have pulled off numerous leaves that were dying including almost 6 node sets off the main stem.
The yellowing is now at the top of the plant and seems it is starting from the edges of the leaves and working it's way in filling the whole leaf. Once they are fully yellow they begin dying at the tips and curling up.
I've read about root rot, N deficiency, calmag deficiency, PH lockout, underfeeding, and other causes that I can't seem to pinpoint on my issue. Although the most likely culprit is N deficiency because I halted veg nutes right when I flipped to flower which I read can result in the stretch of flowering taking all N from leaves.
There are also curled leaves that are on most inner buds and some buds smell kind of sour. Not sure if this is normal or bud rot?

-Strain: purple kush
-Temps: night=70 and day=84ish
-Humidity: 35-53% (day-night) used to be 75% at night
-Two oscillating fans
-One exhaust ventilation fan
-One 400W HPS roughly 12 inches above canopy
-Water every 2-3 days (off/on/off/on feeding) have never used calmag
-Week 3 1/2 of flowering
-water PH 6.3-6.7
-smart pot (fabric)
-2x4x5 grow tent
 
It is normal for large leaves to become yellow during late flowering because flowering fertilizer is low in N but you are only 3 1/2 weeks in. Maybe the excess nutes caused a lock out in the root zone, resulting in deficiencies.
 
Maybe try flushing the soil with lots of pure water to leach out any build up and then apply a proper dose of flowering nuts. Also make sure water ph is wirhin proper range
 
Fender Guitar said:
It is normal for large leaves to become yellow during late flowering because flowering fertilizer is low in N but you are only 3 1/2 weeks in. Maybe the excess nutes caused a lock out in the root zone, resulting in deficiencies.
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That seems like a likely culprit, know anyway I can fix the lockout?
 
Fender Guitar said:
Maybe try flushing the soil with lots of pure water to leach out any build up and then apply a proper dose of flowering nuts. Also make sure water ph is wirhin proper range
Click to expand...
My water PH has been within 6.2-6.7 measured by a digital ph pen. I was thinking of adding big bloom because I heard it helps promote green growth.
 
First leach soil with 1 gallon of pure water for every gallon of soil to eliminate accumulated fertilizer. Once thoroughly leached, let the soil dry a bit before watering with a mixture of water and nutes. Do not overfeed to avoid lock out again.
 
Fender Guitar said:
First leach soil with 1 gallon of pure water for every gallon of soil to eliminate accumulated fertilizer. Once thoroughly leached, let the soil dry a bit before watering with a mixture of water and nutes. Do not overfeed to avoid lock out again.
Click to expand...
I usually water half a gal every time I feed because of the risk of overwatering. Is this bad for how big the plant is?
 
jswett1100 said:
that would be dependent on how bad the deficiency was. have you been feeding heavy? is that like week 4? or 3?
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It's week 3 ish of flower and the problem really started after the flip. I feel like I haven't been feeding heavy at all besides a couple of overdoses of grow big (fox farms) during veg. I accidentally fed her with grow big that had been sitting in a gallon for over a week. Is it bad to reuse the same water after one feeding? I feel like this could have caused some problems
 
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