Urine and wood ash fertilizer

According to a study from a group of environmental scientists at the University of Kuopio in Finland, human urine and wood ash make a reasonably potent tomato fertilizer, boosting plant growth and fruit yield dramatically over untreated plants and nearly keeping pace with conventional fertilizer. The research appears in the August 26 Journal of Agricultural and Food Chemistry.

The idea did not come completely out of left field—urine and ash have individually found use in helping plants grow, and their beneficial aspects appear complementary on paper. A commonly used nitrogenous fertilizer called urea is prevalent in urine, and wood ash (the Finnish group used birch) is rich in nutrients, such as potassium and calcium, that urine lacks.

In the greenhouse test, urine alone actually produced more tomatoes than urine with ash did—and neither treatment produced quite as much as did the researchers’ mineral fertilizer. But both urine-based fertilizers roughly quadrupled fruit production when compared to unfertilized control plants. The researchers estimate that the product of a single individual’s micturition could fertilize 6,300 tomato plants a year, yielding more than two tons of fruit.

From http://www.scientificamerican.com/blog/post/p-is-for-plants-human-urine-plus-as-2009-09-04/?id=p-is-for-plants-human-urine-plus-as-2009-09-04

I am going to do this.

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