New growth curl...

ph 5.8, ebb n flow, ppm 940 (recently lowered from ) temp 78. hydroton grow medium. im only flooding about 2x a day as im trying to repair from recent root rot issues. cold this be a sign of underwater or does it seem to be heat stress or salt buildup/nutelock? there is a slight tint of yellow on the tips.

Let me say one thing first "I KNOW SHIT" lol. Is that your res temp.? What is your multiplier for TDS? Why only flooding twice a day what does that have to do with root rot? Again I know nothing so does limiting flooding help? If your res temps are 78 its to high IMO. If your meter is .5 multiplier I would also say to high. FYI all of my new growth on some strains curls a bit and then straightens out my tips are just a bit yellow but that dissapears in a few days, not dry (yours look it). I have a tray that I leave flooding 24 and it does way better than timed. My plants tend to look like yours if I let PH get to high but 5.8 seems fine. Is your meter accurate? Have you tried flooding more to see if that helps? Where did your sun leaves go lol?

Bump up your feed schedule to maybe 4x for15 min each.. Maybe back down on nutes for a while til they straighten out. What's your res temps?

Try dropping the PH to 5.6 and see if that helps. I do E and F, too. Mine works best at 5.6, and I get issues if I go above 5.8 at all. Every single time I have had leaf curl like that it was a PH issue.

Also, your res temps shouldn't matter much in ebb and flow, that's mainly a DWC issue, but 78 does seem a bit high.

If it was me, I would adjust PH first and wait a day or two. If no improvement, I would change my nute solution.

i got rid of my ebb and grow set up because i found it is almost impossible to not get root rot unless you're buckets are elevated higher than your control bucket. the remaining little bit of water in the buckets after a drain cycle is what does it. you are probably still being affected by pythium in some way and will continue to be as long as you run the infected plants. I ran two flood cycles a day for months and it was perfect so it is not anything to do with that

Mithrandir420 said:

Try dropping the PH to 5.6 and see if that helps. I do E and F, too. Mine works best at 5.6, and I get issues if I go above 5.8 at all. Every single time I have had leaf curl like that it was a PH issue.

Also, your res temps shouldn't matter much in ebb and flow, that's mainly a DWC issue, but 78 does seem a bit high.

If it was me, I would adjust PH first and wait a day or two. If no improvement, I would change my nute solution.

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you better believe your res temp matters in the ebb system too. if something is allowed to breed in the res it will be introduced to every plant.

needlesnpins said:

you better believe your res temp matters in the ebb system too. if something is allowed to breed in the res it will be introduced to every plant.

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Not like it does in DWC. In 15 years of E and F I have NEVER needed to check the temps of my res, nor have I ever had any issues from it. Cleanliness is more important. Also, if you read what I actually wrote you will see that I said it "shouldn't matter much". Not that it does not matter. Some of you people are too quick to correct others.

Also I use E & F trays. I don't use buckets for the very reason you mentioned... standing water. In ebb and flow your roots should not be sitting in puddles of water. It defeats the purpose of ebb and flow.

Is there a difference between ebb and flow and flood and drain? And if you use pails is it not a RDWC that is timed? I'm so confused lol. I have actually let my one tray rise to 6.1 ph and that is the one that has the curl, I do try to keep it at 5.8.

There's no real difference, both terms mean the same thing. There are different styles of E & F, but basically if the plants container gets submerged, or flooded with water, then allowed to drain away, it is an E & F set up. (Or flood and drain, whichever term you prefer.)

RDWC is Recirculating Deep Water Culture. Your roots are always submerged, but the solution circulates to and from a res. If your roots are always in the water it's not ebb and flow. If your solution drains away and the roots are not submerged for a length of time it's not DWC.

Hope it helps!

Thanks Mithrandair that does clear things up and I kinda thought thats how it all worked but just wanted to clarify. My setup is both then as I either leave pump on or time it depending on how a strain behaves. Thanks again!

Don't you just love all these different opinions, hum... which direction to go?