Can ferts go bad? - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 01-08-2008, 05:32 AM Thread Starter
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Can ferts go bad?

I have been using 2 year old dry potassium nitrate from Greg Watson to dose my 20 gallon aquarium. After weeks with this aquarium I've noticed plant growth that lead me to believe of a nutrient deficiency.

Since I have no fish, the first thing I thought was a deficiency in nitrate. I do EI dosing so I would normally dose 1/4 tsp 3x a week. Before I did a water change yesterday I tested the water and it came to 5 ppm of nitrate (after 4 days of not dosing.) I dosed 1/2 tsp after a water change and tested the next day, nitrates come to about 10 ppm.

I did a little experiment disolving 1/2 tsp of potassium nitrate in half a cup of water and tested that. It only came to about 15 ppm of nitrate. BTW the test kit was bought Sunday and is made by API.
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post #2 of 4 (permalink) Old 01-08-2008, 12:51 PM
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No dry ferts don't "go bad".

And you completely overloaded your test kit with your experiment.

And API nitrate test kits are not the best. Even if you do follow directions to the letter you can get a lot of variance from test to test.
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post #3 of 4 (permalink) Old 01-08-2008, 01:39 PM
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A lot of "ferts" are actually minned right out of the ground ... in general, as long as you keep "most" ferts stored in a dry location and in my opinion a dark location they will have a long shelf life ...

Many people who have asked me how I recommend storing ferts are suprised to hear that I keep mine in their plastic bags wrapped in a brown paper sack under my aquarium ... of course after 30+ years of accidents, I rarely have a water problem under my aquarium <grin> ...

So keep your ferts dry and you will be fine ...


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post #4 of 4 (permalink) Old 01-08-2008, 03:52 PM
eds
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Quote:
Originally Posted by GregWatson View Post
Many people who have asked me how I recommend storing ferts are suprised to hear that I keep mine in their plastic bags wrapped in a brown paper sack under my aquarium ...
Hey, great to learn I use the same hi-tech storage solution as the "experts"!
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