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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

Mike E joined Vlad Jovanovic's group
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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
Apr 11
Bob Campbell replied to Vlad Jovanovic's discussion Humonia and Struvite
"I was saving mine in 2 liter soda bottles.  After about 8 months they began to crack.  Luckily they were not stored under my bed. "
Feb 25
Andrew Chapman replied to Vlad Jovanovic's discussion Humonia and Struvite
"Hi Vlad, I joined this forum purely on the basis of your amazing struvite research and to ask the question, what about the analysis??? Please tell me you have more info to part with? My interest is in using struvite as a rock phosphate substitute…"
Feb 25

Moderator
Vlad Jovanovic commented on Rob Torcellini's video
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NUTS #4 & FAQS (News, Updates, Thoughts, and Stuff)

"Thanks Rob. Nice video. Real glad to hear that you guys made your goal for the grow-grips :)"
Feb 15

Moderator
Vlad Jovanovic replied to John's discussion Ok, one more time on KH
"Steve, to be fair...Yes, you absolutely can utilize both hydroxides as well as carbonates/bicarbonates within the same system. You do not 'have to pick one or the other. And my potassium hydroxide costs me NOTHING. Zero, zilch, not a…"
Feb 6

Moderator
Vlad Jovanovic replied to Pat James's discussion Outdoor Winter Planting
"Hey Pat, Can't much tell about the plant growing portion of your swimming pool set up from the one pic you have posted...but you might be better off making little polyethylene domes around your plant grow beds. That way you can vent them during…"
Feb 2

Moderator
Vlad Jovanovic replied to Leslie's discussion High PH, Help!
"Hey guys, kale does need a bit more magnesium than lettuce and other greens (hence why eating kale is a good source of Mg). Problem is at lower pH levels Mg deficiencies seem to be exacerbated, while at high pH's it's iron (Fe) that then…"
Jan 31

Moderator
Vlad Jovanovic replied to Ryan Garlington's discussion which heater to buy
"Yes, they do seem to use a lot of energy. http://www.aquaticeco.com/pages/full_width/94/Heater-Sizing"
Jan 29

Moderator
Vlad Jovanovic replied to John's discussion Ok, one more time on KH
"It's hard to say what "a lot" would be...even if we knew what strength HCL you were using (% in solution)  "
Jan 27

Moderator
Vlad Jovanovic replied to Alex Veidel's discussion Thrips
"Hey Rich, I doubt that you are ever really going to see fish deaths as a result of spinosad. Another thing that spinosad apparently wont kill, are particular populations of Western Flower Thrips that have developed a resistance. The thrips I had…"
Jan 27

Moderator
Vlad Jovanovic replied to John's discussion Ok, one more time on KH
"Hey Alex, you lower kh the same way you would lower carbonate alkalinity (the two are hopelessly interconnected, so much so that they are often considered the same thing) and how would lower pH (pH and kh also share a corollary relationship)...that…"
Jan 27
Andrew Coscia joined Vlad Jovanovic's group
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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
Jan 16

Moderator
Vlad Jovanovic replied to Mark Andrews's discussion BPA and Use of PVC in Aquaponic Systems
"Hey Nate...I don't know if PP is 'one of the most toxic plastics to produce' or not, since none of them (plastics) are exactly 'fun' for the environment...but even in the case of PP production, it seems like the largest…"
Jan 13

Moderator
Vlad Jovanovic replied to Mark Andrews's discussion BPA and Use of PVC in Aquaponic Systems
"The only issues I can think of surrounding rigid u-PVC are environmental ones which are rooted in it's manufacturing process. Again, if you need flexible hose there are many other options. @Carey...yeah, it's sure been a while…"
Jan 13
Carey Ma left a comment for Vlad Jovanovic
"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…"
Jan 12

Moderator
Vlad Jovanovic replied to Mark Andrews's discussion BPA and Use of PVC in Aquaponic Systems
"I doubt you'll find any such info as it relates to AP specifically...But you can avoid BPA (and other potential phthalate issues) by using only rigid u-PVC. Remember, BPA and other phthalates (plasicizers) are used to make PVC soft and pliable.…"
Jan 9

Profile Information

How did you find us?
Search engine (Google)
If you found us through a search engine, what search words were you using?
Aquaponics
Are you an aquaponic gardener already?
Yes
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)
Other
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 2 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…
Continue

How To Get What You Want

Posted on November 25, 2012 at 6:47am 7 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…

Continue

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…

Continue

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…

Continue

Comment Wall (29 comments)

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Join Aquaponic Gardening

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.

Cheers

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

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…

Cao,

bolje vas nasao!

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

Pozdrav!

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,
Moderator
Alex Veidel
said…

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 www.belovedcommunitychicago.org which is currently being updated so the new website will be www.thebelovedcommunitychicago.org. 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,
Moderator
Jon Parr
said…

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

http://community.theaquaponicsource.com/group/californiaaquaponics/forum/topics/santa-cruz-area-ap-tour-august-18th-and-25th

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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