Can anyone identify this nute issue? pics

dgwaan · Apr 14, 2014

Hi All,

Having a little trouble with some discoloration on my babies, can anyone help identify?

Used rootbastic from seeding for 2 weeks, now in week 4, stopped using them and moved to veg nutes about a week ago.

Using 70% of recommended dose of Ionic Grow

My theory is a deficiency after taking them off root stimulants, does this hold water? Or does anyone suspect nute burn?

Thanks

beaves IOW · Apr 14, 2014

I don't know too much about nute burn, I've always started off at around 1/4 strength for the first week of feeding (around week 2 above soil) then 1/2 strength around week 2-2 1/2 and so on and never had troubles with burn. On your last but one pic it looks to me like heat burn?? What lights are you usin? And at what height?

Happy Growing

dgwaan · Apr 15, 2014

400W HPS
average temperature 26c

Yeah I think the light was too close at the time, moved it up to about 30cm above now.

I think I might have NPK deficiency due to the spots being on the lower leaves, also the top leaves still have good colour, and there is no stunted growth issues.

I think that it might be because I took them off the root stims, so I might put them back on it. Most sites say you should use it only at the start, but a friend said that I should use it all the way through.

Would it be safe to use both grow nutes, and root stim at the same time?

Peace

beaves IOW · Apr 15, 2014

I keep my 2 600w hps lights about 30-45cm above the canopy at all times as so not to burn the leaves, if you can hold your hand comfortabley underneath for about 20-30 secs without discomfort you will be fine.

I've had the same issue with yellowing leaves from the base and gradually rises up, as far as I'm aware its N deficiency or a build up in the soil preventin N being absorbed

Happy Growing

tekdc911 · Apr 16, 2014

ya the tops look like light was to close or a hot spot in your tent from lack of air movement
the lowers look to be not enough light i usually loose the first real leaf on the plant on almost every grow seeing how the canopy covers them up
the black necrotic patches could possibly be from overwatering ive had that happen before could be your ph getting out of wack

tekdc911 · Apr 16, 2014

did you use dolomite in your mix or are you supplementing calmag ?

dgwaan · Apr 16, 2014

Thanks for the replies. Some more images for you guys

No worries about the tops anymore i don't think, but the yellowing on one is getting worse lower down :S

I don't think the lack of light is an issue as I have another two which i haven't raised yet, and they're doing fine at almost the same height as the yellowing which is occurring on the older one.

No Dolomite used, using Ionic Grow 3-1-5 and Root Bastic (~0.2ml per litre, recommended between 0.1-0.3) which has K,Cal,Na, Mag, Fe, Manganese, Zink and Boron

neonknight420 · Apr 16, 2014

I would give them a good dose of nitrogen. It looks like the classic signs of a nitrogen deficiency. Good luck.

tekdc911 · Apr 16, 2014

google " praying for magnesium " that one prolly is just a nute whore

dgwaan · Apr 17, 2014

thanks neonknight420, I will do. Got a PH test kit on the way soon so will be able to tell if the nutes are just getting trapped.

Would it be worth flushing everything out with clean water and getting back on the nutes afterwards? I imagine if it cant take up the nutrients then the soil would become toxic?

tekdc911, sorry mate I didn't get what your point there

Unrelated, on average how tall do autoflowers get, by around week 4?

Peace

tekdc911 · Apr 17, 2014

depends on genetics and conditions on height
bottom pic on your last post rear left plant that plant is praying the leafs are pointing up like a Y
they just call it praying for magnesium the leaves can also get a chrome bleaching ,yellow out or get white or rust colored spots its different plant to plant its a magnesium def could also be a N def but i would start with cal/mag seeing how every pheno shows a def a lil different and has totally different nute demands from plant to plant of seeds from the same batch that plant may require alot more then the others nute wise which would make it a nute whore
i just said google it so you could learn it yourself instead of me just saying cal/mag when it looks like a N def but i honestly think you would get more benefit from a stronger dose of magnesium then you would from a veg feed honestly

dgwaan · May 8, 2014

tekdc911 said:
depends on genetics and conditions on height
bottom pic on your last post rear left plant that plant is praying the leafs are pointing up like a Y
they just call it praying for magnesium the leaves can also get a chrome bleaching ,yellow out or get white or rust colored spots its different plant to plant its a magnesium def could also be a N def but i would start with cal/mag seeing how every pheno shows a def a lil different and has totally different nute demands from plant to plant of seeds from the same batch that plant may require alot more then the others nute wise which would make it a nute whore
i just said google it so you could learn it yourself instead of me just saying cal/mag when it looks like a N def but i honestly think you would get more benefit from a stronger dose of magnesium then you would from a veg feed honestly

Thanks, sorry for the late reply.

Checked to see how ph was doing, had 5.9 runoff, so I think the soil was around a 5.7~5.8

Did a flush and have had them off the nutes every 3rd water, also added some extra cal/mag and moved them to bloom since last post. The yellowing hasn't stopped, but has reduced quite a bit. I reckon some of them will be yellowing due to the top canopy though, will get some pictures up soon

dgwaan · May 9, 2014

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Can anyone identify this nute issue? pics

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