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Vlad Jovanovic's Discussions

Bad Batch of Plant !t Media (LECA)

Started this discussion. Last reply by Jeff S Nov 22. 16 Replies

Ok, so after using about 70, 45 liter bags of LECA (Lightweight Expanded Clay Aggregate) made by a few different companies, I've finally ran into bad batch.Since early spring of this year, we've used…Continue

Tags: Plant!t, pH, hydroton, LECA

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 Sep 26. 49 Replies

Found this article kind of interesting...…Continue


Vlad Jovanovic's Page

Latest Activity

Vlad Jovanovic replied to Chris Blanco's discussion HID Lighting Coverage
"You don't need to get too 'crazy', but you do want to be able to vent the heat if need be. You can direct that heat either back into your grow room when needed (cold days/nights)...or you can vent that heat into your living space…"
7 hours ago

Vlad Jovanovic replied to Chris Blanco's discussion HID Lighting Coverage
"Chris keep in mind when buying your ballasts, that using the controller you linked you will need ballasts that run on 240 volt (not the 120 volt).  I know it doesn't say on that web page you linked...but that Titan Helios 4 product is…"
13 hours ago

Vlad Jovanovic replied to Chris Blanco's discussion HID Lighting Coverage
"Hi Chris, Those types of controllers are nice items, but not a necessity. You can use standard type timers. Just off-set the timers (even by just a few minutes apart) so that they don't all kick on at the exact same time...meaning so that they…"
15 hours ago

Vlad Jovanovic replied to Chris Blanco's discussion HID Lighting Coverage
"Hi Chris, Generally, as a rule, with the fewer sources of light in a grow room, you end up with more shading issues. The extent of which, course depends on what it is you are growing. You're almost always better off with more fixtures/bulbs…"
18 hours ago
Mike commented on Vlad Jovanovic's blog post The Organic Label and Agri-Business
"That is sad to see... I've bought some of the one star "organic.""

Vlad Jovanovic replied to Chris Blanco's discussion HID lighting in the group Artificial Lighting
"Watt per watt, dollar per dollar, lumen per lumen... HID's are much less expensive to own and operate when compared against fluorescent lighting systems. Period. I have yet to see a flourescent tube that performs even halfway decently after 7…"

Vlad Jovanovic posted a blog post
Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"@ vlad nitrates still off the charts. how about duckweed ? it should be alright to place some duckweed in the tanks since it is fishless. right ? also, my ph is steadily @ 7.5. I wonder since there is no nitrification action going on because there…"

Vlad Jovanovic replied to MikeH's discussion Need help.!! Might have screwed up my cycling.
"Yeah, there are a lot of 'nitrifiers in a bottle' products...and most of them are rubbish, and wont really speed up cycling.  "
Dec 6

Vlad Jovanovic replied to MikeH's discussion Need help.!! Might have screwed up my cycling.
"Mike...that is a normal part of cycling called the "nitrite spike" phase. Adding 'lots' of ammonia will prolong the spike a bit (but your system will get beyond that phase eventually nonetheless). Cutting the ammonia dosing both…"
Dec 5

Vlad Jovanovic commented on Carey Ma's photo

Typical valley soil profile

"Good to see you around again Carey :)"
Dec 4

Vlad Jovanovic replied to Michael Welber's discussion How big do fingerlings need to be before being introduced to large tank with big fish?
"Well, I'm sure that you can probably just eye-ball it...but if you  are serious about wanting to measure...the formula for determining the "oral gape surface" is Mouth width multiplied by Mouth depth, divided by Body width…"
Dec 3

Vlad Jovanovic replied to Michael Welber's discussion How big do fingerlings need to be before being introduced to large tank with big fish?
"Big enough not to fit into the mouths of the larger fish. That's the general rule (as far as I'm aware) across the board for most all species..."
Dec 3

Vlad Jovanovic commented on Abel Garza's photo

Habanero peppers

"Yeah, tell me about it  "
Nov 30

Vlad Jovanovic replied to MikeH's discussion Need help.!! Might have screwed up my cycling.
"Ok, got it. When you go to start cycling again, add the 1/2 cup to 2/3rds cup to your 700 gallons at once...then just hang back and monitor for a week or so... I'm very weary of using things like "Prime" or other conditioners with…"
Nov 30

Vlad Jovanovic replied to MikeH's discussion Need help.!! Might have screwed up my cycling.
"I wouldn't bother replacing the plants. If the fish and crawdad's much the better. But be aware that some of these chemicals sometimes take a while to kill. Often, many items impact different organs of the fish, and/or their…"
Nov 29

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

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 (31 comments)

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At 8:42pm on November 28, 2014, Ivy said…

Hi Vlad, thank you for text me. Let me know which microbiological fertilizers  you are registering now 

At 8:50am on November 21, 2014, uri sitnik said…

hi Vlad

i have read all your posts',and it is as reading my own Thoughts.

six mounth ago i left my job trying to do things that i like (carpentry, pottry, etc)

creating for my soul,

and AP system to fead me.feelig that small comertial AP can provide some small income to make me go around .

and today i have come across your post ,and your picters and i can see you are doing AP comertial (corect me if iam mistaken)  i would like to ask you for some of your Know how if you are willing to shere

thank you  uri

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.


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