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Wood ash and urine fertilizer?

yummy yellow small onesBoing Boing has an interesting post on a National Geographic news article that reports on a recent round of tests to see how productive a mix of human urine and wood ash would be for tomatoes.

The plants fertilized this way yielded 4 times as much fruit as non fertilized plants, and bore a significant increase in the nutrient magnesium.

I would be a little concerned about the long term salt build up that may occur with this method and need more information before I try something as risky as mixing a salty substance with our topsoil.

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urine fertilizer
how would it be different than peeing in straw, in terms of adding salts to the soil?
Comment by brett Sat Oct 3 00:48:06 2009
comment 2
I'd say it'd be pretty much equivalent. Have you tried peeing on straw and had no problems with salts?
Comment by anna Sat Oct 3 07:59:35 2009
comment 3
Ive peed in leaves, but not enough to make a significant impact. I'm interested to learn more about this
Comment by brett Sat Oct 3 12:16:11 2009
comment 4
Me too! I'm going to keep my eyes peeled for some definitive information and will definitely report anything I find.
Comment by anna Sat Oct 3 15:10:33 2009

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