Diego Footer on Permaculture Based Homesteads - from the Eat Your Dirt Summit
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DEF diesel exhaust fluid as a fertilizer?

Posts: 1950
Location: Cascades of Oregon
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A new use for Urea (57-13-6 MSD) is in the soon to be required Diesel Exhaust Fluid (DEF) in diesel vehicles after 2010.
The fluid is H2O and Urea 68%:32%
Just curious if it might be a fertilizer option?
Posts: 2103
Location: Oakland, CA
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It's synthetic urea, so of course it's not an option for organic farmers.

It also will tend to burn away the organic matter in soil, by promoting microbial growth that makes protein from the urea but eats humus as its main source of calories.

If you're getting rid of some, and also have some compost browns laying around, I see no reason not to build a compost pile, once you've done the math on how much urea goes to each bushel of dry leaves/wood chips/palm fronds/etc. It should go very far, if the math I did on another thread is any indication.

I think if you want to use synthetic urea, a bag of the dry stuff will likely sell for less money than the same urea would go for once it has been diluted and bottled and labeled and marketed and lobbied-for.
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