Backyard Aquaponics
A place to discuss aquaponics

Hi all.
it's been a little while since i posted my first ibc attempt.
No i haven't given up on it, just been busy with my second attempt.
Anyway, my new tomato leaves turning yellow starting from the edges and slowly dying and spreading through.
I thought it was potassium deficiency (loooking at some pics on the net) now not so sure because all other plants not showing the same symptoms bar the celery next to it.
Could it be some sort of virus???
Thanks for helping out.

More pics

What's your pH of source water and system water? What are you using to supplement the plants? It does look like potassium but I can't seem to be able to zoom into the picture so hard to say definitely.

+1

If it's the newest growth it's probably iron or nitrogen. If it's the old growth it could be potassium. You might have the tomato showing potassium and the other plant either iron or nitrogen deficiency (looks like the whole plant might be affected). Tomatoes are warm weather plants if the water or air temp is low it may just be having troubles taking up potassium. The other plant could be having troubles getting enough nitrogen because the tomato is getting first crack at it. Take a good look and figure out which part of the plants are affected, that's the key - some nutrients are mobile and others not so much.

thanks guys,

I haven't added any supplements at all, it's a fairly new system built it back in late April, just have been relying on the fish to do their job. plus I'm trying to avoid adding anything if I don't have to.

looking at it again, I suspected the tomato seedling itself wasn't in a very healthy condition when I bought it, plus we had a few cold snaps in Melbourne (down to single digit Celsius).

system is partly roofed and we have been having many rains and stormy days (partly explained why my peas have attacked by powdery mildew).

I might just pull it out and try again when the warm weather a bit more consistent.

other plants in the same GB is doing well with no signs of deficiencies.

Sounds good. Keep in mind that some plants will show deficiencies before others and these can be used as indicator plants. Kale is a good indicator plant for much of the year.

thanks scottie

i'll keep kale in mind. do they like summer heat?

Not that much you'd have a break during the hottest part of your year but could get a couple crops in on either side of that. I use the Red Russian Kale since it's pretty easy to grow. I don't usually need an indicator plant for the warmer weather crops since I know them pretty well.