We planted our first aquaponics crop of tomatoes, spinach and celery. I would appreciate any feedback to the following outcomes.
Aquaponics unit: "Barrelponics" built from 3- food grade 55 gal barrels, 15 very healthy gold fish occupy one barrel on it's side, wellwater with perfect ph, 300 GPH Marine AC pump, washed pea gravel media in 2 1/2's of a 55 gallon barrel.
I really appreciate any feedback.
I would guess that a deficiency of nitrogen, magnesium, potassium, or a even a combination of the three is the problem. That seems like a lot of tomato plants for a barrel system. You could maybe try thinning them to two plants and supplementing potassium and magnesium and see how things go? I have a 300 gallon system and struggle with the one tomato plant that I have in with the rest of my plants, so I totally get your frustration. Good luck!
I attended a class about growing tomatoes a few weeks ago. This is perfectly normal for tomato plants. The instructor even has a name for it called "the harvest point". The older leaves die off. This instructor has been growing tomatoes since he was 10. It's a family business and he grow tens of thousands of tomato plants. Sorry I could go look up his name but I can't remember it at the moment.