help with yellow leaves.

Auto, week 2 veg, DWC, flora series nut, 600ppm, ph=5.7, 100wLED (20in distance), RH=30-40, T=20-28C (70-82F).

Any idea what I can do to fix this? Thanks!

I don’t do DWC but my guess would be nute/salt burn. I want to be very clear. I’m not saying 600ppm is too high but it could be to high for your environment, like high temps/low humidity. The demand for water could be causing to much uptake.

Potassium(K) deficiency, probably locked out by calcium or improper ph.

looks Like ( k ) deficiency as stated above - yellowing along margins of leaf and tip “ burn ‘‘ mimics nute burn.

Not to familiar with flora but use Maxibloom powder ( from start to finish ) in DTW grows. As far as ppm 600 is ok , I run 600-800 during veg.
I run at 5.9 ph and tap ( no calmag needed since in water already ). Do you check ph of mix before use or in rez ?

Issue is correctable and am thinking ….. ph drift.

Thanks guys.

I used RO water, then added Flora micro, gro, bloom. I was trying to follow the 1:1:0.5 ratio among the three. I checked PH after mix, and before use, I also checked ph every day or so.

Flora bloom has the most potassium, maybe I didn't add enough of it, I will add more today and see how it goes.

Alexandxav said:

Thanks guys.

I used RO water, then added Flora micro, gro, bloom. I was trying to follow the 1:1:0.5 ratio among the three. I checked PH after mix, and before use, I also checked ph every day or so.

Flora bloom has the most potassium, maybe I didn't add enough of it, I will add more today and see how it goes.

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You want to use a 1:1:1 ratio of those three nutes at this stage. That doesn't mean increase the EC, but rather balance the ratio.

When was the last time you calibrated your pH pen?

You're using RO with nothing except migro, gro, bloom? No calmag?

ec121 said:

You want to use a 1:1:1 ratio of those three nutes at this stage. That doesn't mean increase the EC, but rather balance the ratio.

When was the last time you calibrated your pH pen?

You're using RO with nothing except migro, gro, bloom? No calmag?

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Yes, I added more bloom and then replaced 20% of the solution with water. My pen was calibrated about 6 days ago.

I only started a few days ago adding hydroguard beside micro, gro, bloom. I don't have calmag. My tap water is 200ppm. Should I be using tap water instead of RO?

Alexandxav said:

Yes, I added more bloom and then replaced 20% of the solution with water. My pen was calibrated about 6 days ago.

I only started a few days ago adding hydroguard beside micro, gro, bloom. I don't have calmag. My tap water is 200ppm. Should I be using tap water instead of RO?

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You have to use calmag when using RO water because RO is stripped completely of magnesium and calcium. The interveinal chlorosis on the older growth is identifying as a magnesium deficiency.
Try adding 4ml per gallon of calmag before adding in the 1:1:1 ratio of the GH trio and then the hydroguard.
As you go to mid-veg, you want to change the GH ratio to 2:3:1 (micro:grow:bloom) and then when it throws its first pistils, change to a 2:1:3 ratio of the GH trio and then you can start cutting back the calmag to about half as you progress in flower.

When the ppm is 600 and 5.7pH at the start, what is the ppm and pH the next time you check your reservoir?

I think PH didn't change, not beyond +/- 0.2. PPM went up to 650.

I am going to do a complete change tomorrow when I get Cal-Mg as you suggested, will also lower starting PPM to 500 as 600 seems too high. Thanks!

My opinion is use tap water as already told. And an epsoms salt foliar. spray. I suggest a weak mix of 1/4 tsp to 1 quart of water. A tsp of fish emulsion in the mix would round out your cal/mag band aid. I see magnesium deficiency.

How are they doing worsr better. they looked liked high ph and slightly hungry.