Ah Hem! Well another source of nitrogen we flush everyday: urine.
I have a clump of garlic that my dog Roscoe cannot resist. I don't know if Ill ever be able to eat that garlic!
http://en.wikipedia.org/wiki/U...
Quote.
AgricultureMain article: Fertilizer
"Urine contains large quantities of nitrogen (mostly as urea), as well as significant quantities of dissolved phosphates and potassium, the main macronutrients required by plants, with urine having plant macronutrient percentages (i.e. NPK) of approximately 11-1-2 by one study[20] or 15-1-2 by another report,[21] illustrating that exact composition varies with diet. Undiluted, it can chemically burn the roots of some plants, but it can be used safely as a source of complementary nitrogen in carbon-rich compost.[22]
When diluted with water (at a 1:5 ratio for container-grown annual crops with fresh growing medium each season,[23] or a 1:8 ratio for more general use[22]), it can be applied directly to soil as a fertilizer. The fertilization effect of urine has been found to be comparable to that of commercial fertilizers with an equivalent NPK rating.[24] Urine contains most (94% according to Wolgast[20]) of the NPK nutrients excreted by the human body. Conversely, concentrations of heavy metals such as lead, mercury, and cadmium, commonly found in solid human waste, are much lower in urine (though not low enough to qualify for use in organic agriculture under current EU rules).[25] The more general limitations to using urine as fertilizer then depend mainly on the potential for buildup of excess nitrogen (due to the high ratio of that macronutrient),[23] and inorganic salts such as sodium chloride, which are also part of the wastes excreted by the renal system. The degree to which these factors impact the effectiveness depends on the term of use, salinity tolerance of the plant, soil composition, addition of other fertilizing compounds, and quantity of rainfall or other irrigation."
. . . quote continued under Agriculture at the link.
