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#496540 - 09/18/18 06:44 PM Green film after first time fertilizing
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
I fertilized my pond for the first time last Thursday with granule type fertilizer. I went to the pond today and have a green film on a third of the pond, and im sure if the wind changes direction it will follow. Do I need to worry about this film on the pond and will it possibly go away by itself? I'm sure its from the fertilizer due to this being the first time the film has shown up and it was just built in May. I plan on stocking in October and don't want to cause harm to the fish. Oh yeah, some of the green film has bubbles in it. Thanks for the help in advance.

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#496553 - 09/19/18 01:44 AM Re: Green film after first time fertilizing [Re: HenryCountyAL]
anthropic Online   content


Registered: 05/03/14
Posts: 1542
Loc: East Texas, USA
Henry, the experts here (of which I am not!) generally recommend fertilization in the spring when the water temps hit the mid 60s. When the water gets hot, say mid 70s plus, most of the time fertilization is not advised.

If the film is a neon-green color, you may have blue-green algae which isn't good. If so, I'd wait until it dies back before stocking. Wouldn't add any more fertilizer, either.

But the experts might totally disagree with me, it wouldn't be the first time I got something wrong.
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#496559 - 09/19/18 07:32 AM Re: Green film after first time fertilizing [Re: HenryCountyAL]
TGW1 Offline


Registered: 09/19/14
Posts: 2527
Loc: Harrison Co. Texas
I think you will be ok, but you did not mention how much fertilizer you used and pond size and what your water visibility was before and after the treatment. To much fertilizer might influence more than you wanted. Where is your visibility now?
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#496574 - 09/19/18 12:33 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
Tracy, visibility was about 24 inches before and now it's around 20 inches so it hasn't changed much. I used a cheap granule type fertilizer from the local co op which calls for 40 lbs per acre. My pond is a little less than half acre so i used 17 lbs in a bag and cut an X in it so it wouldn't touch the bottom. I feel like i applied the correct amount in the correct way, but maybe should've waited til the spring...I will just be happy if the ugly film goes away.

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#496575 - 09/19/18 01:03 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
JKS3613 Offline


Registered: 02/12/15
Posts: 116
Loc: Zachary, Louisiana
I'm curious, what were the fertilizer numbers on the mix you used? I ask, because that seems like an enormous amount of fertilizer to me. I use Pond Pro granular 10/52/4, and they only recommend about 5 lbs or so an acre. I actually stopped fertilizing about a month and a half ago since it seemed that all I was doing was feeding the FA.




Originally Posted By: HenryCountyAL
Tracy, visibility was about 24 inches before and now it's around 20 inches so it hasn't changed much. I used a cheap granule type fertilizer from the local co op which calls for 40 lbs per acre. My pond is a little less than half acre so i used 17 lbs in a bag and cut an X in it so it wouldn't touch the bottom. I feel like i applied the correct amount in the correct way, but maybe should've waited til the spring...I will just be happy if the ugly film goes away.

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#496581 - 09/19/18 03:42 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
Its 20-20-5 and called Magic fish pond fertilizer made by a fertilizer company in dothan, al. It may have been the excessive nitrogen that was the issue. I just checked out the pond and the green film is now almost non-exsistent.

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#496583 - 09/19/18 03:58 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
JKS3613 Offline


Registered: 02/12/15
Posts: 116
Loc: Zachary, Louisiana
Good deal. Glad it has gotten better for you!

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#496631 - 09/20/18 12:13 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
Ok, so I went and checked the pond this morning and it almost looks like a bubbley oil slick on the entire surface. I sat and watched a while and see bubbles coming up from every where, slowly. We didn't have much wind yesterday and it hasn't rained in a couple weeks. This is starting to freak me out. Anybody have an idea?

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#496633 - 09/20/18 12:34 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
ewest Offline
Moderator
Hall of Fame 2014

Lunker

Registered: 03/08/05
Posts: 19621
Loc: Miss.
What is your visibility ?
Are there fish in the pond ?
No more fertilizer this year.
Did you have the soil/water tested to see if you even need fertilizer?
Many ponds don't need any due to rich dirt/pond bottom.
That is to much N (first number) for me. Often 0 N is needed. Excess N often causes blue/green algae blooms. See this archive.

http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=96127#Post96127


Edited by ewest (09/20/18 12:35 PM)
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#496677 - 09/21/18 01:50 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
I also think its probably due to excess nitrogen, thus all the bubbles. I had my water tested and was told i could benefit from lime and fertilizing. This first round of fertilizing was really just a trial and error run since I haven't stocked yet. Would you pull out the bag that has the remainder of fertilizer from the pond?

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#496678 - 09/21/18 01:50 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
Visibility is still around 20"

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#496696 - 09/21/18 09:00 PM Re: Green film after first time fertilizing [Re: HenryCountyAL]
ewest Offline
Moderator
Hall of Fame 2014

Lunker

Registered: 03/08/05
Posts: 19621
Loc: Miss.
If there are no fish I would just let it work through.
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#496713 - 09/22/18 02:27 AM Re: Green film after first time fertilizing [Re: HenryCountyAL]
Rainman Offline
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Lunker

Registered: 06/06/07
Posts: 6982
Loc: St Louis, MO area
Originally Posted By: HenryCountyAL
I also think its probably due to excess nitrogen, thus all the bubbles. I had my water tested and was told i could benefit from lime and fertilizing. This first round of fertilizing was really just a trial and error run since I haven't stocked yet. Would you pull out the bag that has the remainder of fertilizer from the pond?


Lime alone often raises pH enough to allow the uptake of dissolved nutrient already in your pond, without additional fertilization.

The bubbles are likely trapped oxygen produced and or carbon dioxide respired from the BG algae bloom


Edited by Rainman (09/22/18 02:29 AM)
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#496728 - 09/22/18 10:43 AM Re: Green film after first time fertilizing [Re: HenryCountyAL]
ewest Offline
Moderator
Hall of Fame 2014

Lunker

Registered: 03/08/05
Posts: 19621
Loc: Miss.
Rainman makes a good point. That is why you need to know the situation first before adding fertilizer. If low alkalinity is the problem (limiting factor) then add ag lime. Don't follow with fertilizer unless needed. Anytime you remove a limiting factor the results may surprise you. If you have plenty of nutrients but low alkalinity and add lime often the plankton take of like crazy without fertilizer.
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#496729 - 09/22/18 11:32 AM Re: Green film after first time fertilizing [Re: HenryCountyAL]
HenryCountyAL Offline


Registered: 07/12/18
Posts: 22
Loc: Alabama
Thank y'all so much for your help. Its just so weird how it changes from day to day. I will be happy if its good to go when im ready to stock...and I hope we get some rain next week.

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