Nothing new here. straight from wikipedia
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[SUP]
[20][/SUP] or 15-1-2 by another report,[SUP]
[21][/SUP] 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.[SUP]
[22][/SUP]
When diluted with water (at a 1:5 ratio for container-grown
annual crops with fresh growing medium each season,[SUP]
[23][/SUP] or a 1:8 ratio for more general use[SUP]
[22][/SUP]), 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.[SUP]
[24][/SUP] Urine contains most (94% according to Wolgast[SUP]
[20][/SUP]) 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).[SUP]
[25][/SUP] 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),[SUP]
[23][/SUP] 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.