Backyard Aquaponics
A place to discuss aquaponics

best advice so far thanks alot.

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You putting in your iron for the plants right?

And what/how much are you feeding?

for 70 lettuce im feeding bout 80g of fish food per day

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Uvi ratio is 60g/m2 of fish feed to plant canopy. About 40 or half what you growing. Are you using see salt? If using a pond liner also make sure there are no folds that the solids can stay and cause trouble for you.

Most important is to filter water going into dwc to remove the suspended solids.

What is your water turn over time?

Lastly

Could it be deasies or pest.

I just read my potassium here at work again and I'm still getting <0.20 mmol/l. If the molar mass of potassium is 39 I calculate this to be < 7.8 mg/l. I read a hydroponics website that suggests to aim for 270 mg/l (200-400). Am I completely wrong here? I added 8 tsp Eco fungicide as per mr damage but there's still no potassium to be detected. Any wonder my poor plants aren't thriving. pH is still sitting at 6.5 so I've room to add some more although I worry about the additives.

Interestingly I am apparently deficient in a number of things:
Calcium = 51.6 should be 150 -400
Phosphate =12.3 should be 30 - 90
Mg = 24.55 should be 25 - 75
Na = 701 should be < 50
Cl = 1074 should be <75


We've already discussed the NaCl but how am I going to bring up all my deficiencies without buggering my pH. I guess the answer is gradually?

Have you thought about going hydro, colours?

Lol Charlie if you had the shithouse growth I'm experiencing you'd be doing something about it too. I know you guys hate this stuff but I'm getting hungry!

Ha ha, no we dont hate it colours, we want you to succeed of course. Your obviously chemically minded and you have things at your disposal which is great. My only advice is dont over think it... it doesnt need to be hard. Feed fish => plants grow

Unfortunately they're not

colours I was also trying to model my system against hydroponic but I soon found out that by doing this is actually throws off the natural balance within the aquaponics systems and u find the nutrients lock out and tip burns occuring. so thats y I dumped my system and started back ofd naturally and let it sort itself off. one thing I wana ask u. how often to wash your filters..? or more accurately how often do u remove solids from your system.

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I started my system in May and I don't have any filters. I guess there's next years system improvement.

well your calcium in comparison to your other nutrients is on the high side. it may be low in comparison to hydroponics but the ratio of the nutrients to each other are a bit off u may have to drop off the Ca and add bac K till u balance them off. doing a 20% overall system water change will drop you Ca off but 10mg/l but mind u everything else will as drop off by 1/5 of their original amt. but Ca will feel it more

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Yep cookie I was thinking along the same lines. I will test periodically to make sure they're roughly in balance rather than worrying about absolute concentrations.

What did you end up doing with yours?

dump out everything nitrates down to 5ppm. actually someone locally led me down a different path. im going to try it out and I'll let u kno how it works out for me. I'll post pic to show u my progress.

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Ok I look forward to it. We are heading into out rainy season here which I think will improve things but for now I add potassium and dam water.