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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 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…"

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,…"

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

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…"

Vlad Jovanovic replied to Stevan Covic's discussion Advice on hybrid setup
"Yes, the 1 to 1 ratio applies to media beds WITHOUT using a sump. You should never stock a system according to the fish tank water volume capacity, but rather to your bio filtration capacity. But truth be told, even that is not entirely correct.…"
Jul 12

Vlad Jovanovic replied to Stevan Covic's discussion Advice on hybrid setup
"Zdravo Stavane, You don't need to "comply with the 1/1 ratio" even in the set and setting that that "rule" was conceived in (sump-less media bed system) would not apply in your scenario, since you will be using a…"
Jul 11

Vlad Jovanovic replied to Alex Veidel's discussion Vertical Cucumber Growing
"Like Alex, I've been growing self pollinating (parthenocarpic), all female flowers(gynoecious) varieties. Those would be the key words to look for in a seed catalog  They are also tastier (IMO) and more productive than the classic…"
Jul 9

Vlad Jovanovic replied to Alex Veidel's discussion Vertical Cucumber Growing
"Well it depends on high high your ceiling and horizontal wire are...and whether or not you mind climbing a ladder to harvest. (Fine for a few plants at home...not so good if you have thousands of plants :) The height at which you would "branch…"
Jul 2

Vlad Jovanovic replied to Cary Ritchie's discussion Bell Pepper Problems
"Looks like of anthracnose. (Stink bugs are known to carry some diseases, I don't believe that anthracnose is one of them though...but you can check on that). BER (Blossom End Rot) looks a lot like that on sweet peppers as well, but the…"
Jul 1

Vlad Jovanovic replied to Alex Veidel's discussion Vertical Cucumber Growing
"I like the 'umbrella technique'...and a few of its variants. I've also had good success using an 'inclined cordon technique' growing greenhouse cukes in DWC troughs.  "
Jul 1

Vlad Jovanovic replied to Charlotte Seibert's discussion Aphids, ladybugs and worm tea
"It would also seem that in addition to chitanase producing micro-organisms being present in some worm castings teas, there has been some interesting research to explore the role of phenolic compounds, in castings and teas, that act as insect…"
Jul 1

Vlad Jovanovic commented on Mathew Slattery's blog post Huge problem with Raft system. HELP!!!
"The images of that end in the digits 16 and 48 (the lettuce), look like typical crown rot issues...caused by an oomycetic/fungal pathogen. I bet if you look at the portion of the plant where the stem meets the roots (crown) it has turned to a…"
Jun 25

Vlad Jovanovic replied to Richard Kowalski's discussion Raising Carbonates without raising PH
"When I raised the KH to dH4, in one 300 gallon system (using well water from source 1) the pH tested out out 9.6-9.7 When I did the same with a 50 gallon system (using well water from a different source) the pH tested out at 10.2 (at…"
Jun 18

Vlad Jovanovic replied to Richard Kowalski's discussion Nitrates.... from 40 to zero in three days
"Well adding potassium nitrate, or salt peter (un-refined potassium nitrate...un-refined meaning that there is still about 25% calcium nitrate in salt peter) would be potentially much safer than the supplementing ammonia  that you had…"
Jun 18

Vlad Jovanovic replied to Randall Wimbish's discussion Potassium bicarbonate
"I don't know if this qualifies as "at home" (guess it kinda depends on what your basement, or garage looks like :) and I really don't think I qualify as any kind of…"
Jun 13

Vlad Jovanovic replied to Randall Wimbish's discussion Potassium bicarbonate
"Hi Scott,      Not all orthophosphates are plant bio-available either  (It's like the 'ol "all squares are quadrangles, but not all quadrangles are squares"...Just that these compounds will generally…"
Jun 13

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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