Second grow, N deficiency problem?

Hi all, following my first very successful grow I've now started my second after upgrading a lot of kit! I got cuttings from a trusted friend who has a beautiful mother plant which is the psychosis strain.
I'm using the 3 part genesis formula as a couple of mates swear by its results having tested most of the alternatives and I'm growing in hydro.
I used genesis last time and never encountered any problems however my babies have been in veg for 3 weeks and they have come along very well and very fast. The problem I'm having now is 4/5 leaves on each plant are showing signs of what appears to be a nitrogen deficiency. They are I would say closer to the later stages. I have followed the genesis formula exactly the same as I did before and never had any problems.
I guess what I'm asking is, is it normal for some of the leaves the yellow in early stages? I have noted that it seems to be the larger leaves on the plant that have been there almost from day one just grown. All new growth seems to be Green but also um seeing some of the leaves looking a bit deformed, only having 3 leaves, some leaves very fat. They looks healthy and happy just a bit worried!

Couple of pics

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Are you useing cal mag?

I'm not, I've done some reading and closest match I could see was a nitrogen deficiency! You think I need to get some cal mag?

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Hydro? Yes, add cal mag. Usually its like one drop per litre. Id add 20 drops per bucket of calmagic. Im no expert on hudro but thats what ive done. Maybe someone can validate this.

Ok I will get some! I did have an issue at the very beginning.. my ph pen had not calibrated correctly and was quite far off so for the first week the poor things were at around 7.5. Got myself some solution sticks instead and now my new pen I've got them back to between 6 and 6.5. I did read that in hydro the incorrect ph could cause the plants to not take up nitrogen correctly which was why I kind of figured it was n deficiency. From reading up it doesn't look like cal mag can do any harm so long as I do it correctly like you suggest! Thanks for the tip!

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Whilst in veg the fan leaves should not be turning yellow but this is common and not a problem in late flowering.
You are right in saying that it is a Nitrogen deficiency and what is happening is that the plant is starved of Nitrogen so it is using Nitrogen stored in the leaves thus they turn yellow.
Up your nutes and they will be ok.
What is your current EC?

lambert99 said:

Ok I will get some! I did have an issue at the very beginning.. my ph pen had not calibrated correctly and was quite far off so for the first week the poor things were at around 7.5. Got myself some solution sticks instead and now my new pen I've got them back to between 6 and 6.5. I did read that in hydro the incorrect ph could cause the plants to not take up nitrogen correctly which was why I kind of figured it was n deficiency. From reading up it doesn't look like cal mag can do any harm so long as I do it correctly like you suggest! Thanks for the tip!

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for hydro even this seems a touch high for ph... aim more like 5.7-6.0

Oh really? I'll get it down now then! Hate using ph down.. such a small amount drops it so quickly lol! Has any one any experience with the 3 part genesis formula before?

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Flagg420 said:

for hydro even this seems a touch high for ph... aim more like 5.7-6.0

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Yes I agree and was unaware of the PH levels as his last post was submitted at the same as mine.
PH in veg between 5.5-5.8 and inflowering 5.9 to 6.2 that way you will not encounter Nute lock out which could have contributed to your problems

Steve1967 said:

Whilst in veg the fan leaves should not be turning yellow but this is common and not a problem in late flowering.
You are right in saying that it is a Nitrogen deficiency and what is happening is that the plant is starved of Nitrogen so it is using Nitrogen stored in the leaves thus they turn yellow.
Up your nutes and they will be ok.
What is your current EC?

Click to expand...

Thanks mate for confirming what I thought. Well the ec is now 1.2 which is a touch under where the chart I use for the formula suggests and that was purely because on the last grow I didn't ramp it up to quick so they dint get overwhelmed. Perhaps I'll also add a little more nutes to them before I do the ph also


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Awsome, looks like it is the ph that's causing my issues then! I'll get it down! Thanks for the help guys much appreciated

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lambert99 said:

Oh really? I'll get it down now then! Hate using ph down.. such a small amount drops it so quickly lol! Has any one any experience with the 3 part genesis formula before?

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Click to expand...

Get a pipette and adminster small amounts of PH down using that.

lambert99 said:

Thanks mate for confirming what I thought. Well the ec is now 1.2 which is a touch under where the chart I use for the formula suggests and that was purely because on the last grow I didn't ramp it up to quick so they dint get overwhelmed. Perhaps I'll also add a little more nutes to them before I do the ph also


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I always stay well clear of using formulas, the plants will show you when they need or don't need nutes.
Do you know how to look for this?

and be sure n talk yo ur genesis buddies find out their feed schedule, most companies have u using WAY more than needed, way more.... like advanced... easily 2x the nutes if u follow the chart...

lambert99 said:

Ok I will get some! I did have an issue at the very beginning.. my ph pen had not calibrated correctly and was quite far off so for the first week the poor things were at around 7.5. Got myself some solution sticks instead and now my new pen I've got them back to between 6 and 6.5. I did read that in hydro the incorrect ph could cause the plants to not take up nitrogen correctly which was why I kind of figured it was n deficiency. From reading up it doesn't look like cal mag can do any harm so long as I do it correctly like you suggest! Thanks for the tip!

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Click to expand...

Ph of what you are having shouldnt cause lock out of N. Ive ran much higher and had lush green plants.

Flagg420 said:

and be sure n talk yo ur genesis buddies find out their feed schedule, most companies have u using WAY more than needed, way more.... like advanced... easily 2x the nutes if u follow the chart...

Click to expand...

This is good info. I start w 200ppm and then gradually raise it to flower and then hit around 800-1000. Lower is always good to do a first run genetic with.

Thanks again for all the info guys. Just lowered the ph they are were all around 6.5/6.6 so I've lowered them to 5.9 all round. As far as the genesis goes I did tweak it myself on the last grow based on what they said and your right they did give me different values than the normal chart. I know the basics about what the plants what and need and why there saying and I treat them like kids anyways the second they show a sign of anything I haven't seen I'm straight om google lol. I took some pics to show there progress

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Ninjabowler said:

Ph of what you are having shouldnt cause lock out of N. Ive ran much higher and had lush green plants.

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But over 6.0 you are locking out certain nutes like Potassium and giving more nutrients like Phosphorous which it only needs in flowering.

.

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