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PostPosted: Sep 1st, '17, 03:21 
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Hi Folks,

I put up my tilapia aquaponics system about 3 months ago and have had great success. The water is now at 85F and it seems things are slowing down. I'm guessing root rot is one of the reasons. I know there's other possible reasons and I know ways to keep the system colder. For this discussion though, I'm wondering if you can list herbs that you personally have had thriving (not surviving) in warm water 82F-90F.

Thanks for your knowledge!
Benny


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PostPosted: Sep 1st, '17, 20:13 
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mint.....

though depends on whether there is a technical difference between thrive and goes beserk...

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PostPosted: Sep 1st, '17, 20:17 
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dlf_perth wrote:
mint.....

though depends on whether there is a technical difference between thrive and goes beserk...




Ha ha ha

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PostPosted: Sep 2nd, '17, 09:33 
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adding to above, if you want to move slightly from pure herbs...

the various types of water cress go well.
things like rocket and cos lettuce also don't mind warm conditions.
(cos lettuce as 'pick-as-you-need' leaves rather than wait for a head)
rocket & water cress go well direct from seed.

lots of people grow basil but it doesn't always 'thrive'.

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PostPosted: Sep 2nd, '17, 17:45 
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As Darren posted,I have had success with several types of Basil up to 82 but once past that it struggles,in fact everything starts struggling past that mark,it's best in the long run as you say to try to keep the temps down. I manage to keep my water at 78 and that was lining the troughs with polystyrene and using a trickle tower over the sumo to pick up the cooler night time temps,most days i get air temps of 30+ the hot season will see that 35+,so Iam happy with where the water temps stays.

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PostPosted: Sep 3rd, '17, 10:59 
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as you are in San Diego which is very similar to Perth in terms of its summers.

(a) keep you plants under shade cloth or diffused sunlight (ie. greenhouse roof only) over summer,
that helps a lot and also stops the media from heating up as much.

(b) keep your water circulating / siphoning. Plants need oxygenated (aerated) water and this helps.

most heat exchange will be via the grow beds, so select media that is not rock based.
If growing tilapia you are mostly worried about keeping the spring/autumn water temperatures up.
that is where rock based media in full sun can help make a difference. So there is a quandary here.

You don't mention your water volume - larger tanks etc are able to handle hotter conditions better.
And they will help make any insulation more effective.

some of the Asian veg/plants handle warmer temperatures.
But as Andreas notes it gets harder to get effective growth from most things.

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PostPosted: Sep 3rd, '17, 16:58 
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most heat exchange will be via the grow beds, so select media that is not rock based.
If growing tilapia you are mostly worried about keeping the spring/autumn water temperatures up.
that is where rock based media in full sun can help maLe a difference.

I had ten media beds with crushed granite and even under 50% black shade cloth the surface was very hot to the touch,it was at this time water temps would get close to 90f.
Since swapping over to insulated DWCs water temp has only been an issue when it gets to low.

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PostPosted: Sep 6th, '17, 09:54 
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I have not really kept track of my water temps and still learning but this is my first summer in the greenhouse, air temp was 82 pretty much constantly all summer day or night so I assume water was the same, with that my basil has grown very leggy between leaves but is growing (we aren't using it fast enough because we got a whole flat of free basil and didn't have plans for it so it's kind of just doing what it pleases. All my other herbs that we're started in NFT are not doing well, assuming too hot. Lettuce I tried the cos / romaine but it doesn't grow very nicely in that heat, maybe if I was picking individual leaves instead of expecting a nice bunch it would be better...

I did not experiment with trying to cool the greenhouse this year... Maybe next year I will invest in shade cloth and leave windows open all summer to let it cool overnight.

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PostPosted: Sep 6th, '17, 10:10 
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One thing that can help against high air temps is to have lower water temps,Cornell ran a series of test which showed that water as low as 18c mitigated against air temps as high as 28/30c. Not as easy as all that though keeping water temps down.

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