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#541179 11/04/21 06:25 PM
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Dr Claude Boyd wrote an interesting article in the recent Nov/Dec PB issue about the impact of different fertilizers on ponds. He mentioned that ammonia based fertilizers tend to increase acidity, but nitrate fertilizers do not.

Like most east Texas ponds, my BOW is naturally infertile & acidic. Should I make an effort to pick out a nitrate type pond fertilizer? What's out there for folks in my situation? Any advice would be appreciated!


7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB & 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS -110




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Originally Posted by anthropic
Dr Claude Boyd wrote an interesting article in the recent Nov/Dec PB issue about the impact of different fertilizers on ponds. He mentioned that ammonia based fertilizers tend to increase acidity, but nitrate fertilizers do not.

Like most east Texas ponds, my BOW is naturally infertile & acidic. Should I make an effort to pick out a nitrate type pond fertilizer? What's out there for folks in my situation? Any advice would be appreciated!

For some reason, this isn't posting. Second try.


7ac 2015 CNBG RES FHM 2016 TP FLMB 2017 NLMB GSH L 2018 TP & 70 HSB PK 2019 TP RBT 2020 TFS TP 25 HSB & 250 F1,L,RBT -206 2021 TFS TP GSH L,-312 2022 GSH TP CR TFS -110




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Originally Posted by anthropic
Dr Claude Boyd wrote an interesting article in the recent Nov/Dec PB issue about the impact of different fertilizers on ponds. He mentioned that ammonia based fertilizers tend to increase acidity, but nitrate fertilizers do not.

Like most east Texas ponds, my BOW is naturally infertile & acidic. Should I make an effort to pick out a nitrate type pond fertilizer? What's out there for folks in my situation? Any advice would be appreciated!

What's your alkalinity?


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Hardness and alkalinity both in mid to upper thirties. I've dumped a lot of lime over the years, but it's a never ending battle.


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Originally Posted by anthropic
Hardness and alkalinity both in mid to upper thirties. I've dumped a lot of lime over the years, but it's a never ending battle.


Dump a BUNCH more in. I'd want to see it in the mid 40's before I'd consider putting in any fertilizer. We are a good 100 points higher than you are and do nothing to the water.


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Originally Posted by esshup
Originally Posted by anthropic
Hardness and alkalinity both in mid to upper thirties. I've dumped a lot of lime over the years, but it's a never ending battle.


Dump a BUNCH more in. I'd want to see it in the mid 40's before I'd consider putting in any fertilizer. We are a good 100 points higher than you are and do nothing to the water.


Frank, Given you have seen some very strong blooms in the past ... both planktonic and BPW ... these water quality parameter seem to be limiting factors. You may have plenty of nitrogen and phosphorus but just need to right chemistry to mobilize these nutrients.


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Originally Posted by jpsdad
Originally Posted by esshup
Originally Posted by anthropic
Hardness and alkalinity both in mid to upper thirties. I've dumped a lot of lime over the years, but it's a never ending battle.


Dump a BUNCH more in. I'd want to see it in the mid 40's before I'd consider putting in any fertilizer. We are a good 100 points higher than you are and do nothing to the water.


Frank, Given you have seen some very strong blooms in the past ... both planktonic and BPW ... these water quality parameter seem to be limiting factors. You may have plenty of nitrogen and phosphorus but just need to right chemistry to mobilize these nutrients.

I completely agree with your last statement. When the PH of a water sample flips it will flip really fast. When you have all these nutrients available but not tied up with another covalent bond they can just flip in minutes.

If you can use calcium carbonate as much as possible the material will act like a buffer. It will bond with free nutrients and try to keep the PH at 7.2 as best as it can. Only calcium carbonate has this ability to do this.

Now from my back ground in chemistry ammonia sulfate based fertilizers are very alkaline but when added to soil tend to go acidic because plants really like the ammonia and not the sulfur. This leaves the sulfur free in the solution to become acidic. If you had free calcium carbonate kicking around this would absorb the extra sulfur making calcium sulfate and tie it up again out of the solution.

At some point one will have enough calcium carbonate that the PH will stay and fix at 7.2 and will not move no matter what fertilizer is added. At this PH most of the needed fertilizer is readily available for plants and errors on the safe side. A lower PH say 6.5 will be best for water fertilizer but can be hard to keep from growing out of control.

Just my thoughts and view. Cheers Don.


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Originally Posted by jpsdad
Originally Posted by esshup
Originally Posted by anthropic
Hardness and alkalinity both in mid to upper thirties. I've dumped a lot of lime over the years, but it's a never ending battle.


Dump a BUNCH more in. I'd want to see it in the mid 40's before I'd consider putting in any fertilizer. We are a good 100 points higher than you are and do nothing to the water.


Frank, Given you have seen some very strong blooms in the past ... both planktonic and BPW ... these water quality parameter seem to be limiting factors. You may have plenty of nitrogen and phosphorus but just need to right chemistry to mobilize these nutrients.

Agree - and with other comments above. First get a good water quality test (probably have one already). Best path is to add lime wait and see what will happen naturally when water temps get to 60F. You may not need fertilizer at all but if you do I bet it will only be P that you need (0-46-0 for example). Take an alkalinity reading when water starts to show color - that will tell you how high the alkalinity needs to be to work in your pond. Never rush a fertilizer program without the facts as you can go from 30 inch visibility to 4 inches in a couple of days.

Last edited by ewest; 11/09/21 11:15 AM.
















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