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Vlad Jovanovic's Discussions

Choosing an appropriate variety among cultivars

Started this discussion. Last reply by Jeffrey Ihara May 22, 2013. 13 Replies

I'm a big fan of brassicas. Especially the Japanese and Chinese types. Most all common economically significant (meaning grown as food crops) brassicas are pretty much known for being pretty reliable…Continue

Plant Growth and System Cycling

Started this discussion. Last reply by Vlad Jovanovic Feb 24, 2013. 8 Replies

These pictures are from a system that I am cycling. The water's pH is 8.2-8.5. The seedlings are less than two weeks old and have received nothing but system water. It's been cold and foggy here for…Continue

Tags: plants, cycling, seedlings, pH

GMO's may have led to increased pesticide/herbicide usage

Started this discussion. Last reply by Vlad Jovanovic Jun 15, 2013. 43 Replies

Found this article kind of interesting...…Continue

Humonia and Struvite

Started this discussion. Last reply by Bob Campbell Feb 25. 31 Replies

This one is kind of 'out there' but I could really use some help...Does anyone know, in practical terms, how one would go about using magnesium, to precipitate struvite out of the humonia, and…Continue

Tags: phosphate, struvite, recovery, magnesium, humonia


Vlad Jovanovic's Page

Latest Activity

Vlad Jovanovic replied to Kelly Boyle's discussion Black spots on my basil
"The best treatment is prevention. Keeping things less wet, humid and hot...regular spraying of your favorite fish safe anti fungal... Like most oomycetic pathogens, there are more or less ever present and take advantage of of conditions (wet, humid…"
1 hour ago

Vlad Jovanovic replied to Mark Andrews's discussion BPA and Use of PVC in Aquaponic Systems
"Good one can always use PP tubing (polypropylene)..."

Vlad Jovanovic replied to Stevan Covic's discussion Advice on hybrid setup
"That basically looks what's called a fluidized bed filter (in the aquaculture industry) aquaponics (hybrid designs) it seems like folks 'usually' have enough bio filtration, but not enough solids filtration ( like Jeremiah…"

Vlad Jovanovic replied to Kelly Boyle's discussion Black spots on my basil
"Hi Kelly...bust out your magnifying glass and check the undersides of the affected leaves Beneath the lesions). I'm betting if you check really carefully, you will likely find a slight grey fuzzy growth. If you do you can chalk your problems up…"

Vlad Jovanovic replied to Maggie Culver's discussion High pH expanded clay
"Hi Scott...there are many, many non-synthetic ligands (or other structures) with which to chelate a metal ion...I got to do a presentation for Sylvia's team about this last winter... In nature, competition between microbes can be fierce, and…"

Vlad Jovanovic replied to Azoré H's discussion Pipe Glue
"It is also possible to put the unions in's a little trickier(depending) but certainly not "super difficult" or anything :)"
Jul 25

Vlad Jovanovic replied to Azoré H's discussion Pipe Glue
"Regular PVC cement works fine...and like Alex mentioned, is safe once it dries. Alex, you can take apart and re-assemble your plumbing by using PVC union joints :) you can…"
Jul 25

Vlad Jovanovic replied to Maggie Culver's discussion High pH expanded clay
"Hi Maggie...take your well water and let it sit out in a glass for about 3 days...then test the pH and see what it says. Your well water may in all likelihood actually have a significantly higher pH than you are being led to think, if you are…"
Jul 24

Vlad Jovanovic replied to Azoré H's discussion Pipe Glue
"Not sure who told you not to glue the pipes, or what kind of glue they might have been referring to...but if you used PVC primer and PVC cement, and let them really have nothing to worry about."
Jul 24

Vlad Jovanovic replied to Jack Lansford's discussion Got a problem with brown leafs on cucumbers
"Well, I guess that would somewhat depend on how you define "release"...but for practical  (non-chem-lab) purposes...No, not really. The little bit of difference in the solubility curve between the two is negligible...certainly…"
Jul 23

Vlad Jovanovic replied to Jack Lansford's discussion Got a problem with brown leafs on cucumbers
"Like folks say...there are many reasons cucumber leaves turn brown and die...and squash blossoms drop...Not all are related to plant essential elements lacking... Potassium sulfate (Sulfate of Potash...K2SO4) doesn't require any sort of…"
Jul 23

Vlad Jovanovic replied to Grant Fines's discussion White stuff on rocks
"Don't sweat's just mineral efflorescence from your source water. That's super common to's mostly calcium precipitates, and tastes pretty…"
Jul 23

Vlad Jovanovic replied to Richard Kowalski's discussion An ounce of Prevention..........
"Hi Richard, Yes,buffering allows one to add needed nutrients while regulating can alternate (as you already are) your buffers. Throw in a magnesium buffer in there too, if your seeing inter-venal chlorosis on the older leaves. Magnesium…"
Jul 20

Vlad Jovanovic replied to Zac Kind's discussion Soil in aquaponics
"Hi Donald...So you are saying that 'adding nutrients without the presence of soil' is what causes legginiess, and not the growers skill (as a hydroponicist...knowing what plant essential elements to add in what quantities and when,…"
Jul 19

Vlad Jovanovic replied to Richard Kowalski's discussion An ounce of Prevention..........
"Hehe, the castings my worms made :)"
Jul 18

Vlad Jovanovic replied to Richard Kowalski's discussion An ounce of Prevention..........
"Yes Richard, it would depend on what they were fed. A while back my casting clocked in at 2.28%Ca and 1.85%Mg 1.73%K 1.43% N  2%P ...and some TE's (trace elements) Also, what will give the appearance of differing essential element…"
Jul 18

Profile Information

How did you find us?
Search engine (Google)
If you found us through a search engine, what search words were you using?
Are you an aquaponic gardener already?
If so, what type of system? (pick all that apply)
flood and drain media, raft, combination
How old is your system?
2 yrs or more
What type of fish do you grow with? (select all that apply)
How big is your fish tank?
4,850 litre
Name a part of a fish (spam blocking question)
Hepatic portal vein
Please tell us something else about yourself.
2131 sq.foot AP Greenhouse completed fall of 2011. Have 8 IBC media beds for growing as well as pre-filtering the DWC troughs. 4,850 litre fish tank, 2000+ litre sump buried in the ground. 546 sq. feet of DWC rafts. Using Carp as it is very tolerable to conditions here, and is also the single most bought/sold/eaten fish in these parts.

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Vlad Jovanovic's Blog

The Really, Really Free Market

Posted on March 16, 2013 at 9:59am 4 Comments

This comes to me by a fellow co- ex-worker (yes, you read that right…I said co-Ex-Worker)…Enjoy!


The Really Really Free Market: Instituting the Gift Economy

There’s no such thing as a free lunch under 

capitalism— For anarchists, there’s no other kind

Disambiguation: According to the capitalist lexicon, the “Free Market” is the economic system in which prices are determined by unrestricted competition…

How To Get What You Want

Posted on November 25, 2012 at 6:47am 9 Comments

What do you want most in all the world? More money, a new car stereo, a vacation? To lose ten pounds, to get home from work in time to see your favorite sitcom? Or is it something more than that, something harder to define?

Maybe you've given up on ever realizing your true dreams, and you settle for smaller things because they, at least, seem possible. Maybe it never occured to you to ask yourself if the goals you've been pursuing really are what you want…


Food for Thought

Posted on September 22, 2012 at 5:18am 4 Comments

Here's an exercise to try at home. You will need a working stopwatch, or another timepiece that measures seconds. Before you begin, seat yourself in a comfortable chair and loosen your clothing.

Watch the second hand as it passes around the face of the clock. Picture the moment of your death, perhaps many decades in the future, or perhaps only a few years or months (who can know?). Wait for the second hand to reach the starting point at the top of the…


Time Well Spent

Posted on August 1, 2012 at 3:00am 4 Comments

Well it seems like I’ve been having the same/similar conversation here in the village with a lot of folks lately that goes something like this…


“Gee Vlad how did you know dot…dot…dot…”


“Well, I read it in a good book/study on the topic” (and if applicable, tried it out to see for myself).


“Ooh, I don’t have time to read”!


“Do you watch T.V”


“Yeah, who doesn’t”?


            “Well, if you…


Comment Wall (29 comments)

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At 3:54am on January 12, 2014, Carey Ma said…

Hi Vlad, long time no talk. How and what are you doing these days? How is your operation going? I have had a pretty busy and exciting year building a new farm. One thing I'd like to share is my use of charcoal as media in my fishless system and in raised beds. What do you think about this, off the top of your head? I'm interested in your opinion.

Hope everything is well and you enjoyed a warm holiday season surrounded by friends and family.


At 1:32pm on November 6, 2013,
Alex Veidel
Whoa, is that activity??? Welcome back Vlad!! Thanks, I hope to have a good time :)
At 1:19pm on September 23, 2013,
Alex Veidel

You know, there's an entire side of your face that I never knew existed....until this weekend O_o

At 5:09am on March 26, 2013, Ivan Djurickovic said…


bolje vas nasao!

Ja sam totalni pocetnik u akvaponici, trenutno gradim svoj prvi sistem i ucim ucim ucim o svemu ovome :D


At 9:23am on February 24, 2013, Bob Campbell said…

This is a section of an essay I'm writing about soil.  The very last sentence describes how the pH is kept in check during the nitrification process. 

I'd like to
   1.  more accurately describe both the nitrification chemistry math of NH4+ conversion to NO2- and NO3-
as well as the
    2. denitrification math involving the hydrogen and oxygen from the NO2 and NO3- in which the N2 is returned to the atmosphere through denitrifying bacteria.

    3. It also seems that the plant exchange of H+ for nitrogen would help the soil retain a higher pH.  Can you help me verify that, and the correct symbol for the form of nitrogen being exchaged?

Maybe a new discussion would be best, but I wanted to specifically ask for your help so I posted my question here.

Bacteria come in two basic types.  Anaerobic which lives without oxygen and produces offensive odors, and aerobic which lives with oxygen and produces pleasant fresh odors.  Bacteria are responsible for recycling carbon, sulfur, and nitrogen.  CO2 is a by product of aerobic bacteria, and sulfur is recycled by anaerobic bacteria.  Nitrogen found in the atmosphere can not be used directly by plants. It must be 'fixed' through a process called nitrification where aerobic bacteria combine nitrogen with either oxygen or hydrogen
to form  nitrite (NO2-), and eventually nitrate (NO3-) ions from the ammonium (NH4+) waste of protozoa and nematodes which consume other bacteria and fungi.  Nitrification produces an acidic pH when oxidation occurs. This process is called reduction because there is a loss of electrons, and it releases energy that is used by the bacteria.   Nitrifying bacteria do not generally like low pH, but fortunately other bacteria called denitrifying bacteria convert nitrogen salts created by the nitrification process back into nitrogen N2 which returns to the atmosphere.
The plants exchange hydrogen (H+) for nitrogen (N?) which also helps to return the pH to a higher level.

At 3:00pm on January 30, 2013, Ilija Aralica said…

Hvala Vlado !

At 9:14am on January 26, 2013, Izzy said…

Hey buddy, thanks for the add!  Talk to you soon.  :-)

At 8:53am on December 7, 2012,
Alex Veidel

My tilapia are coming in a half hour. 10:30am Central Time. Yeah, I wasn't sure if the website actually hosted the videos like it does the pictures, or if it just linked to them, so I tried to upload straight from my computer. Anyway, it won't let me delete the video, at least, not that I can tell. Kinda embarrassing :) I'll load it up to youtube, its just the video version of my pictures.

At 11:41am on November 14, 2012, Tiffany Taylor said…

Lol well thanks for accepting the request!!!! Yes of course I can tell you anything you wanna know about our program. We have a website which is currently being updated so the new website will be Our urban farm project went from a small summer project to a year round thing lol so we are trying to put up all of the info/pics of the work that the kids have done throughout the summer and fall. I can gladly email some photos of the urban farm if you'd like. The kids are really excited about the aquaponics system they are anxious to start lol.


At 4:01pm on August 21, 2012,
Jon Parr

Ha. CMH for camera. Deal.  I posted the pic here:

Can you join us this weekend?

Yes, that was my first steelhead, on my first attempt at fly fishing on the Klamath river last year. Hope to return this year. I'm a fairly regular ocean fisherman, and I love to freedive and shoot big fricken fish, but lakes and streams are new territory. BTW, I'm going out for albacore next week, hope to spear a few. My buddy went out on Saturday and saw a school of 50 plus albacore just lounging under the boat.  Woohoo, can't wait.


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