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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 on Friday. 49 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

Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"well since it is only snugly close it could be "sucking" up outside air continuously. would this be alright or i'm better off closing the water bottle cap tightly or maybe it does not matter and I'm just over thinking this whole…"
5 hours ago

Moderator
Vlad Jovanovic replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"No expiration date. Feel free to close them quite snugly. No gasses will 'expand'...quite the contrary...the air will be used up and you may notice your bottles slightly "crumpled" due to used up gasses. (So you don't have…"
6 hours ago
Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"@vlad Couple of more questions. hope you don't mind. as far as storing the humonia. 1) is there an "expiration" on how much aging before it needs to be discarded ? 2) I have the humonia on a small water bottle and the cap is snugly…"
7 hours ago

Moderator
Vlad Jovanovic replied to Richard Kowalski's discussion Honey Dew Melons
"The white stuff is powdery mildew that affects cucurbits (Podosphaera fusca is the name that I know that by...but it's not the only species that carries the powdery mildew moniker) . It does appear from the photo that you have a touch of…"
9 hours ago
Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"thanks for the valuable information. "
18 hours ago

Moderator
Vlad Jovanovic replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"Yes, 50-75ppm of NO3 would be good. I shoot for 40-60ppm, but the difference is negligible. Just keep the bacteria alive and the plants happy...that's pretty much it... "
18 hours ago
Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"so I was reviewing a couple of videos regarding. essentially it was saying that keeping ammonia and nitrite to 0.5 ppm and nitrate @ around 50 to 75 ppm. I guess give a dose of ammonia if the nitrate level swings below 50 ppm. Is that a good level…"
19 hours ago

Moderator
Vlad Jovanovic replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"Yes, that would be a very safe assumption looking at things in terms of essential element content. There are about 25 elements essential to animal life, only 16 of which are essential to plants. 3 of those elements are 'structural…"
19 hours ago
Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"thanks for the quick reply. I was hoping that you are the one to reply because I have not seen any details of peeponics from other forums. would it be safe to assume that the fish waste is essentially same or similar to humonia in regards to what…"
yesterday

Moderator
Vlad Jovanovic replied to Stacey King's discussion Flood and drain nutrient problems ... suggestions? in the group Fish-less Systems
"No, it's not really adequate for many plants...but what you can do is use double the amount of water you use in the test...thereby bringing up detectable levels to 11ppm. (if you triple the amount of water you bring up the readable range to…"
yesterday

Moderator
Vlad Jovanovic replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"Yes, shake the bottles and use that too. Those white substances are mostly phosphate precipitates (calcium phosphate, and magnesium phosphate...both are quite plant beneficial). They are forming because the urea is hydrolyzing (turning into)…"
yesterday
Butch Pornebo replied to Vlad Jovanovic's discussion Pee-Ponics Flowering - Struvite in the group Fish-less Systems
"not sure if this the right thread to ask this question but ..... So I have a few bottles of aged pee, about 2 weeks old, that I'm planning to use for fish-less cycling and might go peeponics all the way. there are "white substance"…"
yesterday

Moderator
Vlad Jovanovic replied to Peter Wolff's discussion dutch buckets one tomatoe plant or more?
"Hi Peter...assuming you have enough nutrients, light, and pre-filtering of solids (and good temps) you can probably plant 2 toms per 20 liter bucket. I've only done that in square buckets planting each tom in opposite corners and using support…"
yesterday

Moderator
Vlad Jovanovic replied to Stacey King's discussion Flood and drain nutrient problems ... suggestions? in the group Fish-less Systems
"In your scenario it's probably not that big a deal to have the DWC before the media beds...though even in a fishless system where ammonia oxidation is taking place, I still like to have the media beds first in line before any other planted…"
Monday

Moderator
Vlad Jovanovic replied to Stacey King's discussion Flood and drain nutrient problems ... suggestions? in the group Fish-less Systems
"You want to flood your system as often as it takes for the media to stay moist and not dry out. And you don't want to convert to all raft beds, because its in the bio-filters (your media beds) where the humonia is being oxidized into…"
Saturday

Moderator
Vlad Jovanovic replied to Steve Federwisch's discussion What size PVC pipe and threads for IBC tote bottom valve? in the group IBC Aquaponics
"I thought it was what Americans called "2 inch coarse thread"? Also known as... S60x6 thread 60mm buttress/coarse thread DIN 6130 thread Some Shultz brand IBC's use an S80 (3" bore) thread, while some of Shultz's IBC's…"
Saturday

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

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…

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

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…

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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.

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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