Potassium or magnesium deficiency?

[Elf777]

This might seem like light stress, but I raised my light and it is still happening. I have been investigating about potassium and magnesium deficiency and they look similar, which one do you think it is?
315W CMH, temps 20-22Cº, PH 6.2-6.8, feeding as biobizz chart says, light is about at 60 cm distance, bio bizz light mix soil, humidity 60%.

 

[experienced]

Potasium (to my mind magnesium would show as yellowing veins not yellowing between veins.)

 

[Pineboy212]

Uh I know for a fact that is completely opposite

 

[Veritas629]

My plants currently look very similar to yours. I tried epsom salts thinking it was low magnesium. That didn't work. Then I tried coconut water (30ml coconut to 1L water) and they are turning around. So I think my problem was low potassium. Looks like you're in soil or coco, give coconut water a try (15-50ml/L). It has magnesium too, so might work either way...

 

[Pineboy212]

I c mag,potassium,copper damn a lot ,u need to flush it bro

 

[Creeperpark]

NO don't flush because without testing soil you can make a big mistake. You have a water purity problem and it's showing itself. What kind of water are you using?

 

[Creeperpark]

If you have to use a lot of acid to lower the pH of your water then that may be the problem.

 

[Creeperpark]

IF you up-pot your plant into a larger container with the same soil it will buy you more time until you can figure things out.

 

[Pineboy212]

I was saying flushing with a lower ph’d solution would literally reset the the feed or He just doesn’t know what ppm range he should b n
That’s a little obvious

 

[jackspratt61]

How wet have these been? Looks like Calcium and metals to me. Are the plants losing apical dominance?

 

[Creeperpark]

If you begin with water with a 3:1 cal-mag and no impurities you will not have a calcium-magnesium problem. Anything else in the starting water can interfere with the uptake of other nutrients and look like something is missing when it's not. Fortified water and complete fertilization will not have a deficiency.

 

[Three Berries]

I have an Ocean Forest grow with an auto and at about 8 weeks it ran out of nutes. But the first sign was the yellowing leaf tips, then yellowing in general. The yellowing looks to be calcium. It's in full flower now an is eating the stuff up. This is with some limestone added to the soil originally.

I water with 50/50 well/rain that's about 230-300 ppm Ca/Mg 90/10. Other than that jsut a couple extra topical applications of 1300 ppm CaCl.

Are the newer stems strong or are they easily crushed? After adding calcium my stems went from hollow and easily crushed to much firmer.

 

[TanzanianMagic]

This might seem like light stress, but I raised my light and it is still happening. I have been investigating about potassium and magnesium deficiency and they look similar, which one do you think it is?
315W CMH, temps 20-22Cº, PH 6.2-6.8, feeding as biobizz chart says, light is about at 60 cm distance, bio bizz light mix soil, humidity 60%.


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That's magnesium deficiency/lockout.

- Deep green to blueishy leaves.
- The yellow edges and burnt tips.
- The thickness of the leaves.

315W CMH, temps 20-22Cº, PH 6.2-6.8, feeding as biobizz chart says, light is about at 60 cm distance, bio bizz light mix soil, humidity 60%.

Biobizz light mix. The pH is too low. I always mix in 2 tablespoons per gallon of magnesium lime, which takes care of both the magnesium demand and the low pH. And adds lots of calcium.

How I would used any light mix.

I only use light mix for mixing supersoils (1/3 each of washed perlite, worm castings and light mix, with a tablespoon per gallon of mangesium lime as the base mix;
then take half or 2/3 and mix in 2 tablespoons per gallon of bloodmeal (N), bonemeal (P), woodash (K), seaweed (Micros), lavameal/basaltmeal (Micros) - and add 20% perlite by volume to the hot mix;
add a drainage layer of washed lavarocks or growrocks).

Because of all the leaves, you should also check for mites and mildew.

 

[GoneGoose]

If you have to use a lot of acid to lower the pH of your water then that may be the problem.

Good Advice. These pics look just like my plants. I am using a lot of acid to lower PH of water I am having to work with. Any more suggestions would be good. GoneGoose

 

[troutman]

I tried epsom salts thinking it was low magnesium.

Epsom salts is magnesium sulfate.

 

[GoneGoose]

I am using GH Cal-Magic with a different water source that requires less acid to lower Ph. I am at 6.25. It seems to be working but it is not quick.

 

[[Maschinenhaus]]

Alternative Soil mixture for BioBizz Light Mix - 20 liters (by Prof. Dr. Zweed)

+ 10 liters of worm humus
+ 15g Mycorrhiza Soluble
+ 20g brown algae
+ 20g mixture Trichoderma strains, Bacillus subtilis, humic acids and algae extract - like BioHealth WSG TH BS
+ 20g Fulvic acid like Fulvital Plus WSP
+ 300g activated plant carbon
+ 80g primary rock flour
+ 80g GuanoBat
+ 5 hands full of lava granules or pumice

Then you do not have to buy expensive fertilizer bottles according to the BioBizz scheme. It is also best not to buy BioBizz soil but a peat-free alternative without perlite from the hardware store.

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[St. Phatty]

Really interesting, 3 of the 6 primary foods for Cannabis & most plants are Metals - Potassium, Magnesium, Calcium.