I have learned more from Nate then all other sources combined. His videos are easy to understand yet cover even the more complex questions that I had. Thumbs up from a long time subscriber.
Hi Cheryl, You can apply phosphorus foliarly, and it can help, but whether it's effective or not really depends on the crop and when you spray it. If you do apply it foliarly, I would do so when the plant begins to flower for maximum uptake, use and production.
I have a system at a high school green house its 300gal with a 100gal lettuce raft and 2 rock boxes with bell siphon. I think i may have excessive phosphate . I have lots of healthy fish and the system has taken a turn where plants are yellowing ( but with test we have plenty of nitrogen it just doesnt seem availible) covid 19 had school shut doen so now i had to add tap water insted of r.o . I think calcium is a culprit in this. Nate can u help us it would mean the world. Does excessive phosphate block nitrites ? Or is it something else. We have a bio filter swirl filter the rock boxes but no bead filter. Should we get 1? Thanks Agrotech for all the wonderful videos
Yes, purpling is a common sign of potassium deficiency. At high levels of potassium it can affect phosphorus availability (co-precip reactions), but this isn't really something most folks should ever worry about.
yes, i did went to the website from the link you posted at the end of this video and I did find the link for Oct 11. webinar on my second try, but some links on that page are little messed up :)
Wish I knew this before the growing season this year. I think I had a low phosphate soil. Can I add this rock phosphate to a container plant too? Very interesting, thanks. I thought the purple leaves was a deficiency or fungus, so I supplemented potassium with some epsom salts. This was in containers though.
Hello, thank you for the useful vids. Can adding this phosphate will lower the PH? And will this still be considered !, organic way of adding phosphate in the system? Cheers
Hey Doc, Great series as usual! Question: (factoring in lighting cycle changes for veg and flower in a soil grow). During a flower phase. would it be advantageous to pH your water a little higher towards the 7.5+ range to allow for better uptake of the P and K nutrients? Any thoughts appreciated...Thanks for the awesome work you do!
@@bo_392 I'm not being sarcastic. I keep my system slightly acidic and aim for a PH of 6.8. I've never had a problem with K or P uptake at this PH and it shouldn't be an issue until your PH drops below 6.5. At a PH of 7.5+ your K bioavailability starts going down, which is why I told OP that PH is too high. Thanks for frying my brain with rudeness.
about those webinars....you have one from Oct 11. and one Oct 24., but the link on both is for Oct. 24 webinar. Is there a chance to see the one from Oct 11.? Cheerz.
Hello, what do you think about cycle of phosphorus in aquaponic system? considering all the components, hidroponic part and aquaculture part. ¿Where we can find losses of phosphorus?
Hi, I recently came across an interesting paper titled 'Valorization of Bones to Liquid Phosphorus Fertilizer by Microbial Solubilization.' (just google that to find the paper) From what I've read the author seemed to be saying that although rock phosphate is naturally occurring, it is a limited resource and that a more sustainable eco-friendly and efficient option would be the use of microbialy treated bone. Since there is tons of microbial activity in aquaponics systems, do you think that something like steamed bone meal could be suitable?
If we don't have two systems (one for leafy one for fruity) but are growing plants that produce botanical fruits, could you apply phosphorus to just those plants with a foliar feeding?
OOOh ... I had purpling of the leaves on some of my tomato plants this year ... but not in a hydroponic system. I had no idea what it was. If you add too much potassium, can it interfere with the phosphorus ... because otherwise I wonder how that might have happened.
Hey Nate - I've always adjusted my PH and supplemented Phosphorus using H3PO4 - I dilute it with water and drip the solution into the sump over the course of a day or so. Is this wrong? i'am assuming so after watching your video. I've also used KOH on systems with low PH - using the same dripping method. I did notice a little bit more algae but I assumed that algae blooms aren't a problem if the fish eat all the algae??
Hi Noam, That's not necessarily wrong- it will work. You want to watch how much you're adding with something that's really soluble like that though. Yes, it would probably stimulate some algae growth, but that's to be expected. Algae becomes a key link in your nutrient cycles over time.
Could low phosphate make a tomato plant produce small tomatoes? I had some yellow cherry tomatoes in pots in the back yard and they all seemed to be so small. I assumed it was that that the plants were just genetically small.
How much rock phosphate for a 55 gallon system? If I add a teaspoon of potassium, calcium and magnesium will phosphorus offset the balance? What is the ratio I need to add? 2 tsp P to 1 tsp everything else? Thank you
Hey +chocolateduc - There is no ratio. Basically, you need to dose phosphate at the rate that your plants need it. Typical ratings on rock phosphate are 0-2-0 to 0-5-0, so keep that in mind. If you have fruiting crops and notice a deficiency, then starting with around a tablespoon every 3-4 weeks should be sufficient until you see the deficiency symptoms disappear. Just make sure you shade your tank! And if you want to pace it out a little bit so it’s not a lot all at once, that would be good too. Hope that helps! If you'd like a quick reference nutrient key, we have one available for $0.99 here: shop.brightagrotech.com/downloadable-nutrient-deficiency-key/
Hey Dr.Storey, while researchig Phosphorus i stumbled upon the effect of PO4 transforming to FePO4 under highly aerobic conditions.Apparently that stuff precipitates out an only breaks up under anaerobic conditions. Does this play a role in an AP-System?
After following through with this i came to the conclusion that the main presence of Iron will be in form of FeDTPA and that the purpose of the chelates is to prevent Fe(II) from transforming into Fe(III) which would bond with the Phosphates. In other words: all is good if the Iron is chelated. Would you agree?
Hi +Matthew Wijaya - Making organically bound nutrients plant available. Mineralization tanks allow microbes to break down organic compounds and release nutrients into the solution.
It depends on the system volume and the starting pH, and the hardness of the water and the P demand of the plants, but possibly. Generally, I stay away from pH adjusting down in AP systems, although it's common in hydro.
I've been worried recently about trace amounts of uranium found in phosphate fertilizers. www.epa.gov/radiation/tenorm/fertilizer.html Are there any phosphate supplements that you can recommend that absolutely don't contain trace amounts of radiation?
I know that you have to be careful not adding too much iron to your system or you can lock out phosphate and this can actually cause yellowing of some leaves which can be very confusing ! I imagine the reverse is true as well (too much phosphate can lock out iron). .
Hi Rachel, I have never heard of phosphate lockout from excess iron, but I know it can certainly go the other way (iron and zinc lockout from excess phosphate) and it's certainly worth doing a little research on. We're going to do a video sometime soon on how to monitor some of these important nutrients to maintain them at certain levels.
Hi Nate. I got some red'ish spots on my young rucolla and potato plants. I uploaded some pics at www.dropbox.com/sc/f372fkjzp39ctxv/AABM4ZPzhbzq29eAxmspCg9la#/ Is this a Phosphorus or potassium defficiency? I got potassium sulphate if it would be potassium, but can't find what are the quantities to add. I got a 500L tank.
Hi Tom Behets - looks like you've got a nitrogen deficiency first and foremost. Those spots are so small, it's pretty tough to tell what they are. If they get worse, go ahead and repost some photos for us.
I have learned more from Nate then all other sources combined. His videos are easy to understand yet cover even the more complex questions that I had. Thumbs up from a long time subscriber.
Hi Cheryl,
You can apply phosphorus foliarly, and it can help, but whether it's effective or not really depends on the crop and when you spray it. If you do apply it foliarly, I would do so when the plant begins to flower for maximum uptake, use and production.
I have a system at a high school green house its 300gal with a 100gal lettuce raft and 2 rock boxes with bell siphon. I think i may have excessive phosphate . I have lots of healthy fish and the system has taken a turn where plants are yellowing ( but with test we have plenty of nitrogen it just doesnt seem availible) covid 19 had school shut doen so now i had to add tap water insted of r.o . I think calcium is a culprit in this. Nate can u help us it would mean the world. Does excessive phosphate block nitrites ? Or is it something else. We have a bio filter swirl filter the rock boxes but no bead filter. Should we get 1? Thanks Agrotech for all the wonderful videos
You're welcome!
Yes, purpling is a common sign of potassium deficiency. At high levels of potassium it can affect phosphorus availability (co-precip reactions), but this isn't really something most folks should ever worry about.
Thanks!
yes, i did went to the website from the link you posted at the end of this video and I did find the link for Oct 11. webinar on my second try, but some links on that page are little messed up :)
Could be! It's tough to tell.
Yes, rock phosphate can go in potting soil or be top-dressed to your containers.
Wish I knew this before the growing season this year. I think I had a low phosphate soil. Can I add this rock phosphate to a container plant too? Very interesting, thanks. I thought the purple leaves was a deficiency or fungus, so I supplemented potassium with some epsom salts. This was in containers though.
Hello, thank you for the useful vids.
Can adding this phosphate will lower the PH? And will this still be considered !, organic way of adding phosphate in the system?
Cheers
Hey Doc, Great series as usual! Question: (factoring in lighting cycle changes for veg and flower in a soil grow). During a flower phase. would it be advantageous to pH your water a little higher towards the 7.5+ range to allow for better uptake of the P and K nutrients? Any thoughts appreciated...Thanks for the awesome work you do!
No, that PH is far too high for an aquaponic system :)
@@JackandJillTV thanks for frying my brain with your sarcastic disinformation
@@bo_392 I'm not being sarcastic. I keep my system slightly acidic and aim for a PH of 6.8. I've never had a problem with K or P uptake at this PH and it shouldn't be an issue until your PH drops below 6.5. At a PH of 7.5+ your K bioavailability starts going down, which is why I told OP that PH is too high. Thanks for frying my brain with rudeness.
about those webinars....you have one from Oct 11. and one Oct 24., but the link on both is for Oct. 24 webinar. Is there a chance to see the one from Oct 11.? Cheerz.
Check out the webinar tab on our website!
Great video Nate.. thanks so much :)
Thanks again Nate!!
Hey is there a more quantifiable amount to add, or just sprinkle about 1 tsp over the flowering plants root zone?
Hello, what do you think about cycle of phosphorus in aquaponic system? considering all the components, hidroponic part and aquaculture part. ¿Where we can find losses of phosphorus?
Hi,
I recently came across an interesting paper titled 'Valorization of Bones to Liquid Phosphorus Fertilizer by Microbial Solubilization.' (just google that to find the paper)
From what I've read the author seemed to be saying that although rock phosphate is naturally occurring, it is a limited resource and that a more sustainable eco-friendly and efficient option would be the use of microbialy treated bone. Since there is tons of microbial activity in aquaponics systems, do you think that something like steamed bone meal could be suitable?
Sure Alex Kyger - We've used bone meal in the past with good results.
If we don't have two systems (one for leafy one for fruity) but are growing plants that produce botanical fruits, could you apply phosphorus to just those plants with a foliar feeding?
OOOh ... I had purpling of the leaves on some of my tomato plants this year ... but not in a hydroponic system. I had no idea what it was. If you add too much potassium, can it interfere with the phosphorus ... because otherwise I wonder how that might have happened.
Hey Nate - I've always adjusted my PH and supplemented Phosphorus using H3PO4 - I dilute it with water and drip the solution into the sump over the course of a day or so. Is this wrong? i'am assuming so after watching your video.
I've also used KOH on systems with low PH - using the same dripping method.
I did notice a little bit more algae but I assumed that algae blooms aren't a problem if the fish eat all the algae??
Hi Noam,
That's not necessarily wrong- it will work. You want to watch how much you're adding with something that's really soluble like that though. Yes, it would probably stimulate some algae growth, but that's to be expected. Algae becomes a key link in your nutrient cycles over time.
Minus 3, not 2. Small point but.... Phosphate is a great buffer but is it in high enough concentrations to be one in a stable grow system?
Could low phosphate make a tomato plant produce small tomatoes? I had some yellow cherry tomatoes in pots in the back yard and they all seemed to be so small. I assumed it was that that the plants were just genetically small.
Yes, bone meal works well but can be a tad messy. . .
Can you explain nutrition for tomatoes in hydroponics
Nice. Really informative.
Which thing plant take? Some people said P2O5 other PO4
How much rock phosphate for a 55 gallon system? If I add a teaspoon of potassium, calcium and magnesium will phosphorus offset the balance? What is the ratio I need to add? 2 tsp P to 1 tsp everything else? Thank you
Hey +chocolateduc - There is no ratio. Basically, you need to dose phosphate at the rate that your plants need it. Typical ratings on rock phosphate are 0-2-0 to 0-5-0, so keep that in mind. If you have fruiting crops and notice a deficiency, then starting with around a tablespoon every 3-4 weeks should be sufficient until you see the deficiency symptoms disappear. Just make sure you shade your tank! And if you want to pace it out a little bit so it’s not a lot all at once, that would be good too. Hope that helps! If you'd like a quick reference nutrient key, we have one available for $0.99 here: shop.brightagrotech.com/downloadable-nutrient-deficiency-key/
is there no kind of life form that can produce phosphorus in this system?
Hey Dr.Storey, while researchig Phosphorus i stumbled upon the effect of PO4 transforming to FePO4 under highly aerobic conditions.Apparently that stuff precipitates out an only breaks up under anaerobic conditions. Does this play a role in an AP-System?
After following through with this i came to the conclusion that the main presence of Iron will be in form of FeDTPA and that the purpose of the chelates is to prevent Fe(II) from transforming into Fe(III) which would bond with the Phosphates. In other words: all is good if the Iron is chelated. Would you agree?
+DieAlphaEnte That is correct! Sorry for the late response, but you got it. Chelated iron is the way to go!
Bright Agrotech Great, thanks for responding !
+DieAlphaEnte Of course! Thanks for your thoughtful question and for tuning into our videos! Glad to have you in the RUclips community.
You're welcome, thanks for giving out all this information!
what is the purpose of mineralization tank that you say in the video thank you
Hi +Matthew Wijaya - Making organically bound nutrients plant available. Mineralization tanks allow microbes to break down organic compounds and release nutrients into the solution.
Thanks.
will phosphoric acid used to lower ph to 6.2 provide enough phosphorus?
It depends on the system volume and the starting pH, and the hardness of the water and the P demand of the plants, but possibly. Generally, I stay away from pH adjusting down in AP systems, although it's common in hydro.
I've been worried recently about trace amounts of uranium found in phosphate fertilizers.
www.epa.gov/radiation/tenorm/fertilizer.html
Are there any phosphate supplements that you can recommend that absolutely don't contain trace amounts of radiation?
Yes, use your piss... it has absorbable phosphorus.
I know that you have to be careful not adding too much iron to your system or you can lock out phosphate and this can actually cause yellowing of some leaves which can be very confusing ! I imagine the reverse is true as well (too much phosphate can lock out iron). .
Hi Rachel,
I have never heard of phosphate lockout from excess iron, but I know it can certainly go the other way (iron and zinc lockout from excess phosphate) and it's certainly worth doing a little research on. We're going to do a video sometime soon on how to monitor some of these important nutrients to maintain them at certain levels.
link doesn't work
Sorry about that, we have a podcast here if you'd like to learn more about micronutrients in aquaponics. ruclips.net/video/cfgrCgMGn9Q/видео.html
Hi Nate. I got some red'ish spots on my young rucolla and potato plants. I uploaded some pics at www.dropbox.com/sc/f372fkjzp39ctxv/AABM4ZPzhbzq29eAxmspCg9la#/
Is this a Phosphorus or potassium defficiency? I got potassium sulphate if it would be potassium, but can't find what are the quantities to add. I got a 500L tank.
Hi Tom Behets - looks like you've got a nitrogen deficiency first and foremost. Those spots are so small, it's pretty tough to tell what they are. If they get worse, go ahead and repost some photos for us.
Thanks again Nate!!