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PostPosted: Jan 22nd, '20, 03:07 
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Hello All,

I can not seem to figure out what is going on with my system I have some sort of deficiency not sure if it is a mag problem or nitrogen. Can someone help me out see pics below

System:
PH 7.3
Amm 0PPM
Nitrite 0PPM
Nitrate 10PPM
Temp 78 deg


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PostPosted: Jan 22nd, '20, 09:48 
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I’m no expert but I’d say the middle photo looks like iron. The other two perhaps potassium.

Iron fixed by adding iron chelate (look up specific products). Potassium by either potassium nitrate (adds nitrate too) potassium carbonate (raises ph) or potassium sulfate (never tried) or potassium chloride (also never tried).

Potassium sulfate is also called sulfate of potash (check garden stores). I’ve seen potassium chloride sold as water softener salt. I haven’t used these because I add potassium carbonate to control my ph. If I didn’t do that, I’d add small amounts of potassium chloride and monitor tds (find cheap tds probe online) stop adding or switch to sulfate if tds too high (perhaps >1000ppm). Again, I haven’t tried this so proceed with caution. If you do go this route, pls report back your findings for the benefit of all.




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PostPosted: Jan 22nd, '20, 10:14 
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I spray potassium on the leaves, i normally do not add it to the water. Iron and cal mag I do along with maxicrop. What do you mean by tps probe and monitoring I been trying to find ways to measure potassium or magnesium etc.?

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PostPosted: Jan 22nd, '20, 13:59 
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I think you're already on the right track with the iron and cal mag. The iron in maxicrop will work better if it's spray applied but the pH is a bit high if you're just adding it to the system water. I'm thinking that you should look for results in the new growth - if you aren't getting the curling or puckering in the new growth then you're probable on the right track - the older curled leaves probable won't uncurl.


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PostPosted: Jan 22nd, '20, 16:35 
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When I was new to AP I used to stick a few corn plants in

They are good indicator plants as are Strawberries

There are lots of deficiency charts online for these plants

Its a bit of best guess as different plants have different nutrient requirements

Also too much of one will trigger a deficiency in another

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PostPosted: Jan 22nd, '20, 22:38 
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The charts are great but at times they can be difficult to figure out which is what. What PH should I have in my system I thought that was the proper ph, should it be lower to like 7?

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PostPosted: Jan 23rd, '20, 01:49 
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Your pH is OK but certain forms of iron have reduced availability depending on the pH. The iron in maxicrop is if I understand it correctly, not a chelated form and not as available at this pH so you probably aren't getting the most out of the iron in Maxicrop. It works better when spray applied because there is less of an issue with pH reducing the availability.

If your system water pH falls to 6.2 to 6.8 range then the Iron in Maxicrop will be more available. Anyway, if the yellowing is on the new leaves, it's usually an iron deficiency. The yellowing on the basil does look like it could be and probably is an iron deficiency. Sometimes excess light or heat can cause something similar but I don't think that is the case here.


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PostPosted: Jan 23rd, '20, 01:51 
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+1 on what Scotty said...

I usually keep mine around 6.8 or so. It has been a pretty good PH for my fish and plants both.

My master API test kit actually came with a graph that shows @ what PH ranges effect what nutrients in different ways. Let me see if I can find it...

Did a quick search. There is a charted PH vs Nutrient uptake graph in the following article.

https://planetpermaculture.wordpress.co ... ilability/

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