Zinc deficiency?

[Backwoodsman]

This is my AK48 from Nirvana. Started from seed. 5-6 weeks old. Soil is Fox Farms Ocean Forest with added perlite and 2 tablespoons of dolomite lime per gallon. Plants have only ever received straight tap water, no chlorine in my water supply. 35PPM from the tap. Two out of three AKs are showing this, this being the worst. New growth only. No chemical nutrients ever been given. They are under 150W of 2700K LEDs. I know its the wrong spectrum for veg but it seems to be doing just fine.

Tap water always adjusted to 6.5 pH. Soil tester shows soil pH of 7.0

Is this a zinc deficiency? Overfert? Overfert seems unlikely being they are this far along and the issue is just now showing itself.

I have GH 3 part nutrients available and epsom salt.

Thanks for the help!

 

[Backwoodsman]

Any other information needed just ask. Oh temp 70F humidity 40%. Good airflow. They are due for water within next 2 days max

 

[Vanilla Phoenix]

By what you said, I think they might want some food. I use FF Happy Frog straight outta the bag and start feeding my little ones at 2 weeks from seed using half strength of my full dose.

What size container are they in? Can you post a pic of plant and container?

 

[Mystic Funk]

hey backwoods.

looks like copper or iron. but i'm gonna go with iron because copper deficiencies are very rare...
and I also think it's iron because your tap water has so little ppm in it. and your PH is right were it should be for soil..


most cal/mag has iron in it. try a small amount cal/mag and work your way up. try and get your soil ph down a little too. like 6.3 to 6.5 max. more nutrients are available at that range...

the rest of your plant looks very green but I think they will need a small feeding soon....?


good luck

 

[Vanilla Phoenix]

Just wanna add, that Foxfarm soils are pretty good without adding lime in there. They already have a pH of 6.3. The lime has now changed the pH and the way the soil was designed for uptake of nutrients. Would have been better to just add calmag to your nutrient mix during feeding.

Basically, if it ain't broke...don't fix it! Lol

 

[Backwoodsman]

They are in 6x6 hydrofarm containers.

If you guys are confident on needing food I will give a light feeding tomorrow and see how they respond. I've got nutrients all made up for my other plants.

 

[Vanilla Phoenix]

Thats what I would do. Just start out light. Don't wanna solve your problem and start a new problem! Lol. Give us an update a few days after the feeding.

 

[maimunji]

I have exactly same problem in peat most compost with one strain ak 47. Now I have same problem with one strain in coco thats ca def in my options. In this two grows problems stop after I start cal mag at full dose every watering. Its not overfeed don't loose time to flush and problem goes more advanced. Take cal mag and give em full dose. Follow my advice look in to my threads in infarmary and coco forum. Base nutes doesn't help hit them with cal mag. If not hit them you will see more and more yellow tips at the tops then two rusty dots will appear on the sides of the tips and tips will burns and dying. Plants will continue to grow but with reduce vigor. Hope this help

 

[Backwoodsman]

Thanks for the advice. I gave them a light feeding this morning ~450ppm. I done have calmag and won't be able to get it until this weekend but will then. Compliments of living in the sticks!

 

[maimunji]

Good try this may help may not. I up basic nutes up to 850-950. And nutes is coco specific contain cal mag but this doesnt help me a lot problem goes away when I start full dose cal mag. half dose doesn't help me. Inspect new growth at top main cola. If they put more and more yellow tips hit them.

 

[Bongstar420]

Water with Urea or Ammonia as your N sources instead of Nitrate. 2tbs of dolomite per gal is a lot.

7 is the pH dolomite normalizes to. pH down is a waste of time and money. I can water with pH 10 water and have literally no lock out as the soil is at 6.

This is my AK48 from Nirvana. Started from seed. 5-6 weeks old. Soil is Fox Farms Ocean Forest with added perlite and 2 tablespoons of dolomite lime per gallon. Plants have only ever received straight tap water, no chlorine in my water supply. 35PPM from the tap. Two out of three AKs are showing this, this being the worst. New growth only. No chemical nutrients ever been given. They are under 150W of 2700K LEDs. I know its the wrong spectrum for veg but it seems to be doing just fine.

Tap water always adjusted to 6.5 pH. Soil tester shows soil pH of 7.0

Is this a zinc deficiency? Overfert? Overfert seems unlikely being they are this far along and the issue is just now showing itself.

I have GH 3 part nutrients available and epsom salt.

Thanks for the help!

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