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Vlad Jovanovic's Discussions

Bad Batch of Plant !t Media (LECA)

Started this discussion. Last reply by Vlad Jovanovic Oct 15. 13 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 Rob Nash's discussion DIY submersible water heater, build your own water heater
"The 'black cup thingy' is a Net Pot (a 2 inch one, I believe) and can be found at any 'ol hydro store. The 'slotted PVC piece' can be bought from Farm Tek (and probably some other places...…"
9 hours ago

Vlad Jovanovic replied to Moe's discussion with index valve, each GB will have to wait too long and get dry till it gets a turn
"Moe, depending on whether your sump can handle don't have to wait until each bed is completely drained in order to fill the next one.  You can of course employ a quicker drain time. I'm going to copy and paste this…"
11 hours ago

Vlad Jovanovic replied to Moe's discussion depth of IBC Grow Bed
"They're tears of joy Alex...tears of joy... "
11 hours ago

Vlad Jovanovic replied to Jeff S's discussion Ammonia- What's the True Story?
"Sorry it took so darn long Jeff, but I just now saw your question...Potassium bicarbonate (KHCO3) would be a good buffer. "
Mary&Bobby joined Vlad Jovanovic's group

Fish-less Systems

This is a group for people who have any kinds of fish-less systems, but yet are not doing classical hydroponics. Where we can share what we have come to find about making-home made nutrients, oganic-hydro, pee-ponics, worm tea hydro, bio-ponics, home-made buffers, water chemistry or anything else that is perhaps inappropriate for fish. As well as experimenting and sharing results for  things that might be alright for our aquatic critters.See More

Vlad Jovanovic replied to Moe's discussion depth of IBC Grow Bed
"Your drain time will be determined by the size of the 'weep holes' that you drill in the bottom of your stand pipe. If 30 minutes is too long, go to the garage and grab a larger diameter drill bit  My beds fill in about 9 minutes (the…"

Vlad Jovanovic replied to Jack Dunbar's discussion Magnesium Deficiency? in the group Aquaponics For Beginners
"Finally, something decent to watch on YouTube...Thanks Jeff S. "
Oct 23

Vlad Jovanovic replied to Sonja Martin Young's discussion Alaska Aquaponics could use some help
"Hi Sonja, sorry to hear about your troubles. @Cindi, in your scenario i.e fish not being able to handle the nutrient load, zeolite to sequester ammonia, and water changes was pretty good advice. Unfortunately, Sonja is having 'the…"
Oct 23

Vlad Jovanovic replied to Jack Dunbar's discussion Magnesium Deficiency? in the group Aquaponics For Beginners
"Sure thing Jack. Happy to help. There is a search field (white rectangle) in the extreme upper right hand corner of your screen. It's to the right of your name and to the left of the little magnifying glass icon. It's a great tool, as…"
Oct 23

Vlad Jovanovic replied to Suzanne Hayes's discussion Pulling plants
"Sure Scott, just let me know how much you want. I have some Actinovate (Streptomyces lydicus WYEC 108) as well. Same deal with pricing...meaning we'll just divide what I paid for it (I don't wish to make any sort of profit). Actinovate is…"
Oct 23

Vlad Jovanovic replied to Suzanne Hayes's discussion Pulling plants
"Right-o Alex. Beneficial insects are an integral part of a good IPM (Integrated Pest Management) program. Most people only start thinking about such things after they have somewhat gotten out of which case your beneficials may have a…"
Oct 23

Vlad Jovanovic replied to Rob Nash's discussion DIY Heater, build your own 2000 watt heater for $20 ***DONT USE COPPER OR NICKEL ELEMENTS!
Oct 23

Vlad Jovanovic replied to Jack Dunbar's discussion Magnesium Deficiency? in the group Aquaponics For Beginners
"If you have a sump tank that woils be fine. I'vs added directly to the fish tank in systems that don't have a sump, with no problems. Dissolve the Epsom in a bbucket with some top up water, and then add that water."
Oct 22

Vlad Jovanovic replied to Jack Dunbar's discussion Magnesium Deficiency? in the group Aquaponics For Beginners
"57.5 grams of Epsom salt into 100 US Gallons of water will garner you 15ppm of Magnesium. 15ppm is about half (30ppm) of the total Mg you would want in solution. So it's a pretty low dose and assumes there is some amount of Mg already present…"
Oct 22

Vlad Jovanovic replied to Rob Nash's discussion DIY Heater, build your own 2000 watt heater for $20 ***DONT USE COPPER OR NICKEL ELEMENTS!
Oct 22

Vlad Jovanovic commented on Jeremiah Robinson's group Cold Weather Aquaponics
"Hi Jeremiah, I'm not saying that Jeff's sump will float, but neither am I saying that it will not. Only that if certain conditions conspire to align, it can. I've seen a buried IBC sump do that. Two of them actually. The one sump had…"
Oct 22

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

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…


Speeding Up Seed Germination

Posted on May 27, 2012 at 5:01am 9 Comments

Just because I said in some thread or another, that I would follow up on my results, here it is. The deal is...

I love hot peppers, but hate how long it takes for certain seeds to germinate (sometimes over 2 weeks). This often results in a lot of nail biting, and constant checking moisture levels, temps etc...So the thinking here was that many varieties of hot peppers evolved and proliferated mainly due to birds. Birds, not having taste buds that react to the capsaicinoids that…


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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