What ails my plants?

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Hello people!

As of today the plants are 28 days old, in 6,5 liter containers, clay pebbles in bottom for drainage, 4/5 soil something marketed for growing cacti and starting seedlings and 1/5 some generic potting soil. Under 250w HPS sun (19/5, distance from tops about 25cm), watered every 4-6 days with few liters shared between the 4(no feeding up until 3 weeks old, then 1/3 strenght, then half. currently about 1ml GHE floramicro+2ml GHE florabloom per liter of water + some extra nitrogen), water is left to sit out 12-24h before watering.. relative humidity between about 50-65, daily temperures from 18 to 25c.

Up until about 5-6 days ago the leaves were uniformly green,
now some are starting to look darker than others, some gaining lighter coloration and
some bottom leaves going yellow from the tip and between the veins first, few of the yellowing bottom leaves also have couple very small copperish-brownish/greyish/dead dry patches.

At first I thought I thought it just needed some nitrogen but since the last watering 4/5 days ago with extra nitrogen the discoloration process has only accelerated. (started with single blade bottom leaves, now half-way through 3-blade bottom leaves.

Any growth appears to also have stalled for the past couple of days.

No unwanted insectoid life-forms have been sighted dwelling in tent.


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About 7-8 hours since last watering.

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The temperature is very comfortable 24c but sides on some of the leaves are curling up? No direct wind on the plants.
 
Do yo know the pH of your soil and your water? If not, it's the first thing to check. Read up on "nutrient lockout" if you're not familiar with the term. Also, isn't GH Flora series a 3-part system? Wondering why no mention of flora-gro. GH recommendations for feeding ARE way too strong for autoflowers, but the ratio of the 3 parts throughout the life of the plants is pretty good. Good luck and I hope you get this squared away!
 
I agree, very likely your pH is off, causing a nutrient lockout. We need to know the pH of your feeds as well as the pH of your run off.
 
Hello again people!

I am still stymied by the problem; While the yellowing has slowed down to a comparable crawl, I dont think testing the pH's solved the issue, according to my pH test strips the tap water is little bit above 7 straight from the tap, after a day and after mixing with nutes: about 6 and the run-off measures as slightly above 6.

Also the bag for the soil states that it has 6.2 pH with added 7kg limestone/cubic meter.

As far as I can tell all these values would appear to be exactly where they should?

Also, isn't GH Flora series a 3-part system? Wondering why no mention of flora-gro. GH recommendations for feeding ARE way too strong for autoflowers, but the ratio of the 3 parts throughout the life of the plants is pretty good. Good luck and I hope you get this squared away!

Currently using only micro and bloom from GHE flora as per lucasformula
 
A pH of 6 or slightly above is a bit low. I would suggest you up the pH of your feeds a bit, to around 6.8. That should give you run off in the 6.3 - 6.4 range. At 6, P, cal and mag are locked out.
 
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