What deficiency is this?

kodak91

kodak91

Active Member
Hi,

I'm relatively new to growing and having some issues right now.

This plant is been growing for 6weeks under a 600w hps, avg 25ºC, 40% RH with plenty of exahustion and airflow.

The soil is Biobizz Allmix, and i've been feeding 1L water +1ml biogrow 2 or 3 times a week. PH 6.8. My tapwater is soft and i let it sit for 24h .

Last week this deficiency started (brown spots, yellowing, and i added 1ml Bloom and 1ml CalMag in the next feeding and also transplanted from 11L to 30L pot.

But since then, its getting worse very fast (already removed some fan leaves) and i feel that the bloom and calmag didnt made any difference. I am just underfeeding? Bit lost here...

First 2 pics are when the deficiency started (one week ago), and the remaining pics are from today..

Appreciate some feedback

Thanks
 

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Dank Bongula

Dank Bongula

Well-Known Member
hotrodharley said:
Probably underwatering and definitely underfeeding.
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I gotta agree...one my plants started this same shit a couple weeks back and I am a chronic underfeeder and waterer...I believe it is also strain specific...I have two other different plants that get the same nutes and water, that look better, smaller but better...well actually one looks like what the grim reaper probably grows and the other is beautiful...but not showing sign of underfeeding and watering bongsmilie
 
calicko

calicko

Well-Known Member
I'd noticed your plant looks just fine and is cannabalizing lower leaves to compensate for their lack of direct light. Add more intense light or just leave alone until the fall off because inevitably..they will.
Also, look at the bottoms of each petiole(stem that leads to leaves), if they are purple or bronze, you have a phosphorus deficiency as your soil is becoming Alkaline and on verge of lockout. Bump up nutes by 5ml per L and try bottom feeding with a seedling mat. You have a ton of calcium and magnesium in your soils already, with colder temps and by adding it in cooler temps and a higher ph, thats a recipe for P lockout.
This is unlikely though, your photos also do make your plants look like their cold.
 
kodak91

kodak91

Active Member
calicko said:
I'd noticed your plant looks just fine and is cannabalizing lower leaves to compensate for their lack of direct light. Add more intense light or just leave alone until the fall off because inevitably..they will.
Also, look at the bottoms of each petiole(stem that leads to leaves), if they are purple or bronze, you have a phosphorus deficiency as your soil is becoming Alkaline and on verge of lockout. Bump up nutes by 5ml per L and try bottom feeding with a seedling mat. You have a ton of calcium and magnesium in your soils already, with colder temps and by adding it in cooler temps and a higher ph, thats a recipe for P lockout.
This is unlikely though, your photos also do make your plants look like their cold.
Click to expand...
Its under a 600 HPS 18h a day. The photos were taken outside of the growtent cause of the hps light... Thanks for the input tho.
 
kodak91

kodak91

Active Member
Thanks for the replies. I will give her a proper feed today with higher N-K-P levels and report back in a week.

Also, many people say that biobizz allmix runs out of calcium in 4 or 5 weeks, should i keep adding a small CalMag dose every feed as a preemptive measure ?
 
Dank Bongula

Dank Bongula

Well-Known Member
kodak91 said:
Hi again,

I gave her 4L water with 2ml biogrow + 4ml biobloom + 2ml calmag, 2 days ago but the deficiency keeps spreading to the upper fan leaves...

Some1 help me identifying the problem pls...

Thanks
Click to expand...
Hmm...mine did not spread up, but my lower 2 leaves continued to dry out a little, I wasn't expecting it to immediately stop.
 
kodak91

kodak91

Active Member
Hollatchaboy said:
You got lockout. Do you ph your water before or after adding nutes?
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Yes i have been always feeding with 6.8ph / 7ph. Last feed was 6.3ph ( measure it after adding nuts).

Weird that i would have a lockout. Should i just flush and measure the runoff?
 
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kodak91

kodak91

Active Member
Dank Bongula said:
Hmm...mine did not spread up, but my lower 2 leaves continued to dry out a little, I wasn't expecting it to immediately stop.
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Mine is spreading and affecting basically all the fan leaves at same time.

You think its just too soon to expect the deficiency to stop (since its organic soil and organic nuts) ? I'm suspecting this wont stop... :/
 
Dank Bongula

Dank Bongula

Well-Known Member
20210315_181535.jpg
Mine looked exactly like yours, but has since stopped...this is it right now after 1 feeding and 1 watering. The fan on the other side is slightly worse.
 
Hollatchaboy

Hollatchaboy

Well-Known Member
I had the same problem. I upotted and it cleared up. Then I switched to dry organic nutes and I've not had a problem since. My plants look good imo. No more yellow leaves and purpling stems.
 
kodak91

kodak91

Active Member
transplanted after deficiency started..

I'm bit lost here... Not sure if this is a lockout or still underfed...

If it really is a lockout then i have to buy a better PH pen (i have those cheap ones)
 
Hollatchaboy

Hollatchaboy

Well-Known Member
What soil do you use? If it has any nutritional value, adding bottled nutes might be making it a lil acidic? I'm not exactly sure myself, I'm just trying to deduce some ideas. Could be lockout from toxicity?
 
Hollatchaboy

Hollatchaboy

Well-Known Member
kodak91 said:
transplanted after deficiency started..

I'm bit lost here... Not sure if this is a lockout or still underfed...

If it really is a lockout then i have to buy a better PH pen (i have those cheap ones)
Click to expand...
Screenshot_20210315-215039_Chrome.jpg
It says enough nutrition for a couple weeks. I would just add plain water for now. It says it has microbes. You should ditch the bottled nutes and just top dress. It's less stress, believe me.
 
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