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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 commented on Jeremiah Robinson's blog post Do my Bacteria Get Cold?
"I do not know if my experience is 'generalizable' in every and all instances...but definitely feel that nitrification at lower temps, is better than what most charts/books would lead one to believe. Sort of how a number of years back, it…"

Vlad Jovanovic commented on Jeremiah Robinson's blog post Do my Bacteria Get Cold?
"Sure thing...towards the end of winter, as the thermal mass of the water was exploited, the water temps were as low as 4-6 degrees Celsius at times. I did heat the air with a homemade pyrolytic stove (a slight modification of Jim Fisk's…"

Vlad Jovanovic commented on Jeremiah Robinson's blog post Do my Bacteria Get Cold?
"I cycled my big system (2,100 sq.ft) a few years back,in the fall (October) and grew out my first couple thousand plants that winter. I fretted and worried about ammonia oxidation because all the charts and books painted a rather bleak picture of…"

Vlad Jovanovic replied to Dennis Brooks's discussion Sump overflows
"Yeah, I'm with George (and Alex) on that my 8 IBC grow bed + DWC system, I've been using an indexing valve for over 3 years as well...and in a few other 4 grow bed systems. It allows you to use a much smaller sump than you could…"

Vlad Jovanovic replied to Jeremiah Robinson's discussion High humidity cold weather spinach growing
"Wood heating is drying, propane adds a significant amount of water vapour in the air... Spinach can take some slightly below freezing temps, especially if their are some salts in your system. It uses the salts present as anti freeze. So don't…"
Sep 8

Vlad Jovanovic replied to Jeremiah Robinson's discussion High humidity cold weather spinach growing
"Hi Jeremiah...fungal diseases are always an issues to deal with cool temps and high humidity...and since the water temps are going to be warmer than the air temp, you can be certain of an RH of near 100% (as you've already alluded to). Probably…"
Sep 8

Vlad Jovanovic replied to Dan E. Burns's discussion Transparent grow beds
"Thanks Jeremiah :)"
Sep 7

Vlad Jovanovic replied to Mark Andrews's discussion BPA and Use of PVC in Aquaponic Systems
"Both types are manufactured...PP as well as PE..."
Sep 5

Vlad Jovanovic replied to Dan E. Burns's discussion Transparent grow beds
"I have two different pepper plants in two different clear acrylic display jobbies that I made (turns out the adults love them just as much as the kids who see them). One of them I protect from algae, the other one I do not. Here is the one...The…"
Sep 3

Vlad Jovanovic replied to affanehsan's discussion plants dying in new system
Sep 3

Vlad Jovanovic replied to Xpim's discussion My First System - need advice :D
"It sounds like the composition of the sand is good (your vinegar test). 2-6mm seems a bit small to me, but you'll have to try it out and see what happens over time. It's good that your thinking so much about pre-filtering. With all that…"
Sep 2

Vlad Jovanovic replied to Pam DeLong's discussion How harmful are API Products?
"Yeah, see that's the whole quandary isn't it?  "Should be"..."lawyers talking" etc...etc...etc... While that kind of stuff happens quite often, that that being, a company not hiring and paying for professional…"
Sep 1

Vlad Jovanovic replied to Pam DeLong's discussion How harmful are API Products?
"Pam, all you need to do to get rid of the chlorine in your tap water is to put the water in a barrel or bucket (or whatever) and let it sit out in the sun for a few days. That's it. If you have an air pump and a diffuser (air stone) and live…"
Sep 1

Vlad Jovanovic replied to Xpim's discussion My First System - need advice :D
"Hi might want to forgo the sand. The International Organization for Standards (ISO 14688) grades sand into fine, medium, and coarse (coarse being 0.64mm to 2mm). In the US they sub-divide these 3 grades into 5 grades (the largest particle…"
Aug 31

Vlad Jovanovic replied to Suzanne Hayes's discussion Fish in Brdige Siphon
"They may very likely be 201 grade stainless steel (developed to be a cheaper stainless steel alternative to the 301 and 304 grades. So it's super skimpy on the Nickel). Many less expensive SS  items (like non-galv hose clamps) use this…"
Aug 31

Vlad Jovanovic replied to Suzanne Hayes's discussion Fish in Brdige Siphon
"There is a chemical compound (difloroethane)  used in some brands of duct tape (not all), and that chemical is toxic to fish at certain concentrations. Sorta how potassium chloride (KCl) is on the one hand used to execute prisoners on death…"
Aug 30

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.

Vlad Jovanovic's Photos

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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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