Help leaves turning yellow

I flipped to 12/12 3 weeks ago and have just started noticing this happening, is it a big problem?

1x1x2 BudBox Grow tent
600w Light
Not sure of the size of Exhaust Fan
Passive intake
EC running at 1.4 ppm
PH is 6.2
Using B'Cuzz A+B in Coco


The exhaust fan was on a timer with the light but I have now changed this so it is on 24hrs.

Thanks

Looks underfed.

thanks for the reply, so what do you suggest upping the feed? Currently giving it 1ml per litre, ec is at 1.4ppm. what should I aim for?

what are u feeding ?

underfed N
or overfed P or K too soon !!!

yes looking at it looks like its needing a Nitrogen fix not enough N

Still using veg nutes? If not try it once, use veg nutes to week four of flower and the plants stay greener. Looks like it wants nitrogen.

i oppologise i got this feed mixed with a previous one if i was u i would give a feeding of veg nutes high i N looks like they are needing Nitrogen

hi I'm using b'cuzz coco nutrients, they don't have a veg and flower formula just the same throughout.

if still using veg nutes what doses have u been feeding and i would say up the veg nutes to give it some nitrogen but until i know what doses u been feeding i don't really know have u been feeding half recommended or full strength ??

mcalexis said:

hi I'm using b'cuzz coco nutrients, they don't have a veg and flower formula just the same throughout.

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its different doses thou throughout the plants life not the same a+b all the time is it ?
im not in coco so not 100% but im sure you change dosage through the plants life

Correct 1-2mls per litre in veg and 2-3mls in flower, always a bit sceptical as to using manufacturers suggestions as can be too strong, seems I may have gone the other way!

I'd probably kick it up 25-30% each feeding until I saw improvement or the start of clawing on new growth. More important is to note when the plant started yellowing so on next grow you can take your nutes up earlier.

Thc247 said:

if still using veg nutes what doses have u been feeding and i would say up the veg nutes to give it some nitrogen but until i know what doses u been feeding i don't really know have u been feeding half recommended or full strength ??

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I have been feeding at 6mls per 5ltr jug so 1.2 per litre.

mcalexis said:

Correct 1-2mls per litre in veg and 2-3mls in flower, always a bit sceptical as to using manufacturers suggestions as can be too strong, seems I may have gone the other way!

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It's all good! You need to experience both overfed and underfed looks to get dialed in to growing well.

Bugeye said:

I'd probably kick it up 25-30% each feeding until I saw improvement or the start of clawing on new growth. More important is to note when the plant started yellowing so on next grow you can take your nutes up earlier.

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Going to try that, thanks for the advice people, your help an knowledge great!

phosphorus locks out at 6.2 ish

if you ph pen is a little out your ph might be 6.5 ......

that's my 2 cents ........ Got any change ? Lol jk

Bugeye said:

I'd probably kick it up 25-30% each feeding until I saw improvement or the start of clawing on new growth. More important is to note when the plant started yellowing so on next grow you can take your nutes up earlier.

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same here

Hi sorry if this is obvious but what signs of improvement should I see? will the colour return or will it just stop getting worse?

mcalexis said:

Hi sorry if this is obvious but what signs of improvement should I see? will the colour return or will it just stop getting worse?

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Yellow leaves won't go green again so you are going to judge improvement by seeing the yellowing slow down or stop.