Stunted growth, Slight yellowing

Hi docs,

I have 5x Northern Lights in Veg stage (18/6) and one of them shows deficiencies and stunted growth.
Light: 250W CMH
Medium: BioBizz Allmix Soil
Nute: BioBizz Grow

They are 40 days and they r that size cause i had problems before and after transplanting and that shocked them for two weeks. They r growing nice since then except one.
i fed her two days ago with 1ml/L biobizz grow

View attachment 2454854View attachment 2454855View attachment 2454856


others look fine
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Looks like a nitrogen deficiency.If you've had them in Allmix for 40 days then the nutrients in the medium are probably running out by now.I use the same Biobizz products and it should take a few days for the Biogrow to to kick in,that should sort it out.Just be careful not to overdo it with that Biogrow,I usually introduce it at quarter or half strength when i first start adding it.The yellowing leaves will turn more yellow and drop off but you'll get new growth.They're all looking pretty good though!
Merry Christmas and Happy growing

Googlebot said:

Hi docs,

I have 5x Northern Lights in Veg stage (18/6) and one of them shows deficiencies and stunted growth.
Light: 250W CMH
Medium: BioBizz Allmix Soil
Nute: BioBizz Grow

They are 40 days and they r that size cause i had problems before and after transplanting and that shocked them for two weeks. They r growing nice since then except one.
i fed her two days ago with 1ml/L biobizz grow

View attachment 2454854View attachment 2454855View attachment 2454856


others look fine
View attachment 2454857

Click to expand...

Nothing wrong at all. Not every plant is the same just because it's the same seed stock. You've got one or two yellowing lower leaves on your smallest plant - as you go along, you'll lose some of those lower fan leaves, it's what happens....

As far as feeding goes...how big are those pots (hard to see from pics) and how long have your plants been in them?

they are in 2gallon pots for 3 weeks now. As they reach 1-2ft then i switch them to 12/12 and these pots should do the work.

Googlebot said:

they are in 2gallon pots for 3 weeks now. As they reach 1-2ft then i switch them to 12/12 and these pots should do the work.

Click to expand...

Yes, 10 litre pot is about right if your plants are going to end up 5ft tall ish..... I don't know the soil you're using but it was probably very expensive, yes? It should be a nice nutrient rich medium. And 10 litres of it is quite a lot. I think you should make that 8-8.5 litres, because in that pot you should mix 15-20% perlite into your soil before potting. You may have done that, I can see what looks like perlite on top of your soil, but that may have been what was already in the mix.

You can start thinking about giving them a boost if you want - but I wouldn't, I reckon they've got more than enough going on until flower time - then you need to change the composition a bit to aid that - everything looks fine, just concentrate on getting the wet/dry watering regime right (a bit trickier in a bigger pot than a smaller one), lights, temp and vent and that's all you need to take care of - the rest will follow.

alright mate, i dont worry too much then. I just let the nature do her way.

The problem is either under feeding ,1/1000 sounds quite weak (follow the directions on label, use full str) or the ph is way out causing N ,Ca Mg def. Make sure all waterings and feeds are 6.5 or you will get nute lockout.

Googlebot said:

alright mate, i dont worry too much then. I just let the nature do her way.

Click to expand...

And you have to give her a hand...look at feeding when you switch to 12/12. And don't be afraid to underwater a little - much better to let them get really dry between waterings - if you go too long, they'll let you know pretty quick....leaves droop, tip falls over...then water them and they'll reward you....overwatering is common and is much worse for your plant - it'll take them a while to get over a drowning, but none to get over a bit of dehydration

Good luck pal, let us know how you go

Cheers