Backyard Aquaponics
A place to discuss aquaponics

I have a problem at the moment that the tomato's are growing and flowering but not setting fruit. Has anyone had this problem in their AP systems before? The tomato's are Ox Hearts and are setting fruit in the dirt garden but not the AP.

The AP plant is larger and has more foliage, they both seem to flower ok but only the dirt one has fruit.

Potassiam......or pot ash.....is ment to be lacking ......have to go an check the shed, but by adding it, the flower should stay on and fruit

I regularly add seasol which adds potassium, maybe I need more. My PH is higher than I would like as I lost most of my fish. It's 7.6 but potassium should still be readily available.

will have to go back and read your thread about the fish .......

I add a Yates product....Sulphate of Potash...$ 7 bucks here in town ( probably $3 cheaper where ever you are ) add a DASH....to 3 kL of water....says on the packet it encourages more flowers, improves quality of fruit, helps strengthen resistance of plants to fungus attacks..it works

Seasole alone IMO isn't enough....pot ash, chelated iron, seasole and maxi crop is a better mix

your plants are so lush and green, there is certainly enough nitrates

good luck

it could also be due to summer comming on ??? but I would defenantly try the sulphate of potash... it worked here for the same problem

Same variety of Tomato?

Perhaps trimmin' some of the lower leaves off the AP one would trigger it to fruit?

Any difference in soil vs GB temperature?

Good thinking M, give the plant more energy for the fruiting process

Potassium I reckon, and I disagree with you jessy - all I use is seasol.

Could just be a pollination issue I suppose - why one would attract insects and not the other I have no clue

Perhaps a little tickle up with a paint brush or ear cleaner (cotton tip thingo) might be worth a try?

Come on think about.
Its been bloody cold in Melbourne lately.
Give it a few weeks it'l be OK!

That would be the case if the dirt tomatoes were not working either.

Root temp is more important than air temp, i`d stick a thermometer into the soil and the beds to see if theres a temp difference
A cold snap would probably affect gravel more than soil as the gaps are more accessible to cold air.

you have no fungus or mildew? The water in AP can tend to lead toward fungus if the plant is not well pruned. Bicarb water and veg oil will take care of that.

I'm with Myles, trim the lower leaves, hard. Too much energy going into growth.

I Don't think it is pollination, the growbed's are a haven for insects, I always have dozens of bees getting their water from the beds, it's been a real boon for our whole garden.
I will try that. But I am starting to think it's something to do with the tomato variety and temprature, I have a cherry tomato in the AP and it seems to be setting fruit. Maybe a bit more warmer weather will help.

I've experienced tomatoes not setting fruit when it's too hot. Sometimes the dirt tomatoes set more fruit than the ones inside the greenhouse because the greenhouse gets too hot during the day. Sounds like that isn't the case for you though.