Is it just the bottom set of leaves showing that? If so, I wouldn’t worry about it. Happening to my tomatoes as well. If the rest of the plant looks good, then no worries.
Looks maybe like a nutrient burn 
, maybe your soil is too hot? My second guess would be Potassium … 
I was thinking potassium also judging from web pics. Hope it’s not too rich. That’s probably harder to fix
Tomatoes are very sensitive to fluctuations in moisture levels.I grow in ground for that reason.I recommended as much mulch as you can put in there ,and perhaps putting the buckets closer together or somehow shading the buckets to slow the dryback.Potassium is critical for flower set and spacing.GL 20230620_092420|375x500
This could be part of the issue… also tomatoes don’t like their leaves getting wet so another thing to think about…
What did your soil mix consist of? As I’m seeing it, I’d say just a tad too hot
I bought a local supersoil that said water only and cut that with equal parts promix organic to make it more economical. I then amended the promix portion with Dr. Earth per the instructions and added a bunch of worm castings and perlite.
That’s alot of beautiful healthy tomatoes!
Might be pH because of the promix, promix is about 80-90 % peat and peat can swing all the way down to 5, most who use promix usually add lime too to keep it closer to the 6.2-6.5 sweet spot
Next time I’d suggest using mushroom compost instead of promix, gonna provide a better mix with more organic nutrients and much cheaper at $2.50 a 1 cu ft bag
The fact that it’s all the lower stuff tells me plant is consuming it’s lower self to build it’s upper self so may even just be a hungry plant not getting enough out the soil since it was diluted down with so much peat.
Other thing to consider, whatever Dr earth u added today isn’t gonna be available to the plant for 3-4 weeks so again might be a lack of available nutrition in ur soil.
Id do a pH check, if that lands ideal then I’d be looking at getting more nutrition in ur soil. I’ve done weed veg compost teas on tomato plants with excellect results so a good tea would def benefit it
That typically hits hardest on new growth not the old, since it’s older leaves I suggest otherwise
Thank you. Looking into teas now. I guess I have to make a soil slurry to check ph? I only have my standard bluelab ph meter for hydro.
Unless u got a soil rod that u shove in a watered soil and get a reading in about 10 min.
If u got a hydro one then just put the bucket in another bucket and test the run off, should still give u some idea
Here’s the 3 recipes I use
I’m not sure it’s just the older leaves. Seems pretty much all over. Maybe cause it’s advanced.
I’m looking at what it’s affecting, but hunger is gonna progress till they get nutrients available to them and always starts from the bottom working it’s way up. Just gotta figure out whats causing the hunger whether pH or lack of nutes in soil
Wow that’s good info. Maybe a little more from scratch than I’m ready for. These things would prolly be crushing it right now in my rdwc with a ton of salt based ferts🤦
Run off test will be problematic in these sip containers. They have a bottom rez sorta. No run off. Like mini earth box.
It looks like a lot but once u get the amendments they last for years cuz ur just using lil bits of each, I make my teas lately about 20 gallons at a time and 20 tsp of something like kelp or alfalfa meal ain’t much at all.
Don’t have to use it all even though I suggest it to keep a balanced tea but even something as simple as worm castings, alfalfa meal, and kelp tea is gonna benefit pretty well too but it’s the worm castings that the number one benefit and the main one that really matters
So take a small scoop, put in a solo cup half full and simulated a watering u can collect the run off from?
