Take a look please. Stumped me.

I am growing DWC Bubble buckets. I'll throw the pictures up first so you can see.

It's of one plant (the others are the same) its on the end of week 3 vegging and I am scratching my head so I was hoping someone might be able to give some feedback.





Using Hydro Hy-pro A/B nutrients
Ph5.5 - 6.0
EC 1.4
Air Temp 23C
Water temp 69F
Under CFL 35Wx4
RH 42%
Each bucket has it's own pump, 2 large air stones in each and plenty of oxygen circulating

Tap water, not RO but it is rich in calcium.

Added extra K early in the week but not effective.

We are thinking that it could be a progressive Zinc deficiency but just a guess really.

Thanks

Magnesium deficient I would say.

I honestly think you are frying them with to many nutes

I upped the EC from 1.0 to 1.4 because this is what was happening. Would 1.4 really be too high? (hanna EC meter)

chuck estevez said:

I honestly think you are frying them with to many nutes

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This

lee1000 said:

I upped the EC from 1.0 to 1.4 because this is what was happening. Would 1.4 really be too high? (hanna EC meter)

Click to expand...

He'll yeah that's way to high. They are 3 weeks? They should be @ .4ec.

Did you start in peat or rockwool? You were prolly seeing signs over lack of o2 to the roots, clorosis, and thought they were deficient.

Now it looks like excess p&k are locking out nitrogen. It's defiantly nute burned now.

What is your starting ppm of your water before nutes using the Hanna scale?

hondagrower420 said:

What is your starting ppm of your water before nutes using the Hanna scale?

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0.2-3

They have always had plenty of oxygen running in the water. 6w pump with 2 large airstones in a 5 gal bucket filled with about 30 liters water. I would say that's more than plenty.

Yeah looks like nute burn. 1.4 ec seems pretty high, i use ppm not ec but that is like 600ppm. Way too high for such small plants. Back it way down to like 300ppm and check it each day. If the ec/ppm is dropping then yoj can feed more, if its increasing then your plants are not using as much and the nutes are buikding in strength as the water is used.

Ok so I have dropped the EC to 0.9. Did that a few days ago and the new growth seems pretty healthy for now. Will keep you informed.

Quick update.

It's been a week and the transformation is complete I think. The plants slowed down growth, probably because I hacked all the crap dying leaves away. The EC went down to .70 in the bubble buckets and I connected them up to the IWS bucket system. Just the 3 plants for now. I added water to the res (50gal res with 38 gallons in it) and added 200ml of the Hydro a/b. I also added 15ml magnesium and 10 ml Potassium because I think that this was also a contributing factor to the deterioration of the plants.

Anyway, It has been 2 days since the switch. I have the res sitting outside the room and the temps are usually about 21C but every day I put some bottles of ice water into there and it goes down to around 19C. Guess I'm going to have to invest in a chiller

The temps in the grow room are about 25C and the EC is now at 0.68 from the original .90 from 2 days ago so it seems like the plants are feeding nicely.

Now given that the EC has dropped around 0.2, would I need to let it go for a week and then do a res change? This is what most people advise but I was thinking that, if it were to drop another 0.3 or something, there wouldn't be that many nutes left in the tank to feed them anymore

So I was thinking, I'll just keep topping up the nutes every few days until EC 0.9 and see how they go for a couple of weeks. What's your thinking?

Holy shit..just calibrated my ph pen and it was 1.2 higher than it should have been. No f###in' wonder I've been having problems.......baaaaaaaa