Hello everyone,
could you please help me with this problem(s) ? These are 4 Northern Light autos. Started febr. 8th.
The first 4 weeks 2 ml/lt BioBizz grow nutes. After this 3 ml/lt. On march 24th some leafs turned yellow. So I started with BioBizz Top Max 1 ml/lt. Ph of nutes = 5.7. Without Top Max = 6.3.
I gave them 250 ml of nutes every 24 hours. They re under two LED lamps. Temp and humidity in a good range.
I m using cocs.
1 ml = 0,03381 fl.oz. (US) 1 lt. = 33,81402 fl.oz (US)
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What does your watering volume and frequency look like?
Edit: nm just saw 250ml every 24hr.
Free bump!
idk anything about biobizz nutrients but if these plants are in coco and your feeding with liquid nutes, these plants are showing that they are hungry and need more nutes. Can tell because the leaves are pointing upwards. Seeing NPK deficiency for sure. PH sounds good though for coco. I’d consider using more perlite in the coco next time for more aeration in the soil but should be fine there.
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I don’t grow in coco but as far as I know your supposed to water to runoff. If you don’t you will get salt build up in your coco causing lockouts/deficiencies.
Hopefully a knowledgeable coco grower will chime in.
It’s a combination of things… low nutes, and high humidity I’d guess. I don’t really see a problem, just watch your humidity and make sure they get enough to eat.
Looks to me like they are hungry
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Pro tip: If you get problem, always check the run of pH. If its too high you got salt build up, if it’s perfect. Your plants are not getting what It wants.
Are your coco coir stable? Some brands of coco coir will give you trouble.
Looks like you got multiple problem, and I got a feeling they are related to what others here have been touching.
Coco is a fantastic medium, why it’s so freaking fantastic is that it’s a hydro grow with “dirt”. So it’s very hard to over water coco. I think your medium have been too dry at some point and since you haven’t flushed the coco to run off at watering you got stress from the dry period and a small build up that’s messing with your run off pH. Giving you a lock out.
Pz 
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I do agree with you. There must be runoff. It was nt the case till now with this little water. So I will give them enough liquid till there is runoff and at the same time more nutes.
Thanks for your input !
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Are you using an ec meter?
I’d suggest you gently flush the coco with 0.5ec until ur run off ec is within 0.6 ec of ur input solution. (In ppm’s on the 0.5 scale, say ur flushing with 250ppm, ur run off shouldn’t exceed 550ppm. If it does, continue till it comes within range). This will make sure any salts that have been building up are flushed out of the medium.
Because your lower leaves are yellowing and ur plants looks hungry, once uve done the flush, id suggest you give the plants around 1ec of nutrient solution to get them going.
Always water until u get around 20% runoff. Its called coco dtw for a reason.
I hope this helps.
Edit: Also, id suggest you go for gh 3part and their calmag. It’s very simple.
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Looks like a P deficiency to me, either lockout or not enough going in at feeding time.
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Couple good reads.
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Hard to know for sure but I am leaning toward salt stress.
I feel the tell is the burnt and uppward facing curled leaves.
Probably a bit of lockout going on too.
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I vote for Potassium deficiency, with a Phosphorous deficiency creeping up a bit too.
The papery curled up almost burnt leaves look like she is short on potassium.
The splotching from the bottom up and the almost bluish tint to the leaves though they don’t look nitrogen heavy seems like a phosphorous deficiency that is progressing. The purple petioles couple be an indication of phosphorous deficiency as well.
Looks like recovery to me. Like its coming out of something u did previously.
wish u had a week old pic to compare
I would have to agree, the new growth looks real good.
Might have been a temporary PH issue locking out “P” much like others have suggested.
I see no reason to adjust anything now.
Maybe check PH and the EC/ppm of the runoff/runout.
This way you at least know what is going on there.
I just saw this, musta missed the first time through.
This makes perfect sense…
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Do you have fulvic acid in your toolbox ?
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Temp is not good, leaves are turning up at tips, turn your light down or move it up.
Humidity also not good looks lower than 50
You’re torching these plants, higher temps are affecting water and soil pH, there by effecting nutrient uptake.
Don’t add anything, it’s not starving, it’s trying to survive.
Have a great weekend. 
Have a great night
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I had a good example too, but after checking, I axed her day before yesterday I think. She was great, frosty, no smell 
shes got 3 sisters going outside tho this summer 
Nope. What is if for ?
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High everyone,
thanks a lot for all your valuable inputs. I think all of you are right to a certain extend.
A very big plus growing with coco is, that you can flush the plants - do a kind of reset, and start anew.
This is what I did. Then I measured the runoff after the first 5 liters (approx. 2.6 gallons) and got the following values:
- pH between 5.8 to 6.3 seems to be quite ok
- EC between 1.24 to 2.33 not that good…
Then I prepared 6 liters of nutes including 15 ml BLOOM, 6 ml TOP MAX + 20 ml BIO HEAVEN.
EC of this mix was 1.02 (minus ec of tap of 0.38) = 0.64
pH was 6.9 wich I reduced to 6.3
After flushing all 4 plants with 20 liters (approx. 10.4 gallons) I gave all of them one liter and got a pH from 6.0 to 6.4 and ec values from 1.01 to 1.25 out of the run offs.
I think those are good values to go on with.
What do you guys think of this ?
Edit. I ll share a pict or two in about a week so you all can see how they re doing…
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