I've been interested in this for a long time mainly because pee is free and non toxic/natural. Here's some interesting info from the inter webs. What’s in urine? Urine, 95% of which is water, 2.5% of which is urea, and 2.5% of which is a mixture of minerals, salts, hormones, and enzymes, is not a toxic waste product. Urine is a blood byproduct and though it contains some body waste, it is non-toxic. In 1975, Dr. A.H. Free, published his book Urinalysis in Clinical Laboratory Practice, in which he presents a few critical nutrients found in urine: Alanine, total ..... 38 mg/day Arginine, total ..... 32 mg/day Ascorbic acid ..... 30 mg/day Allantoin ..... 12 mg/day Amino acids, total ..... 2.1 g/day Bicarbonate ..... 140 mg/day Biotin ..... 35 mg/day Calcium ..... 23 mg/day Creatinine ..... 1.4 mg/day Cystine ..... 120 mg/day Dopamine ..... 0.40 mg/day Epinephrine ..... 0.01 mg/day Folic acid ..... 4 mg/day Glucose ..... 100 mg/day Glutamic acid ..... 308 mg/day Glycine ..... 455 mg/day Inositol ..... 14 mg/day Iodine ..... 0.25 mg/day Iron ..... 0.5 mg/day Lysine, total ..... 56 mg/day Magnesium ..... 100 mg/day Manganese ..... 0.5 mg/day Methionine, total ..... 10 mg/day Nitrogen, total ..... 15 g/day Ornithine ..... 10 mg/day Pantothenic acid ..... 3 mg/day Phenylalanine ..... 21 mg/day Phosphorus, organic .....9 mg/day Potassium ..... 2.5 mg/day Proteins, total ..... 5 mg/day Riboflavin ..... 0.9 mg/day Tryptophan, total ..... 28 mg/day Tyrosine, total ..... 50 mg/day Urea ..... 24.5 mg/day Vitamin B6 ..... 100 mg/day Vitamin B12 ..... 0.03 mg/day Zinc ..... 1.4 mg/day (Your Own Perfect Medicine? - Natural Health and Longevity Resource Center) The following are the average quantities of various substances, in 100 milliliters of urine as reported in Introduction to Biochemistry by Dr. Pharon: Substance Milligrams 1] Urea nitrogen 682.00 2] Urea 1459.00 3] Creatinin nitrogen 36.00 4] Creatinin 97.20 5] Uric acid nitrogen 12.30 6] Uric acid 36.90 7] Amino nitrogen 9.70 8] Ammonia nitrogen 57.00 9] Sodium 212.00 10] Potassium 137.00 11] Calcium 19.50 12] Magnesium 11.30 13] Chloride 314.00 14] Total sulphate 91.00 15] Inorganic sulphate 83.00 16] Inorganic phosphate 127.00 17] N/10 acid 27.80 Some other important urine constituents are: Enzymes: Amylase (diastase). Lactic dehydrogenate (L. D. H.). Leucine amino-peptidase (L. A. P.). Urokinase. Hormones� Catechol amines. Hydroxy-steroids. 17-Catosteroids. Erythropoietine. Adenylate cyclase. Prostaglandin's. Sex hormones. Study Results of the first study evaluating the use of human urine mixed with wood ash as a fertilizer for food crops has found that the combination can be substituted for costly synthetic fertilizers to produce bumper crops of tomatoes without introducing any risk of disease for consumers. The study appears in the current issue of ACS' Journal of Agricultural and Food Chemistry, a bi-weekly publication. In the study, Surendra Pradhan and colleagues point out that urine, a good source of nitrogen, has been successfully used to fertilize cucumber, corn, cabbage, and other crops. Only a few studies, however, have investigated the use of wood ash, which is rich in minerals and also reduces the acidity of certain soils. Scientists have not reported on the combinaton of urine and wood ash, they say. The new study found that plants fertilized with urine produced four times more tomatoes than nonfertilized plants and as much as plants given synthetic fertilizer. Urine plus wood ash produced almost as great a yield, with the added benefit of reducing the acidity of acid soils. "The results suggest that urine with or without wood ash can be used as a substitute for mineral fertilizer to increase the yields of tomato without posing any microbial or chemical risks," the report says. ### ARTICLE #2 FOR IMMEDIATE RELEASE "Stored Human Urine Supplemented with Wood Ash as Fertilizer in Tomato (Solanum lycopersicum) Cultivation and Its Impacts on Fruit Yield and Quality" DOWNLOAD FULL TEXT ARTICLE: http://pubs.acs.org/stoken/presspac/presspac/full/10.1021/jf9018917 Human urine for fertilizer is top notch! Its no secret that urine contains everything plants need, its been that way in nature since animals first started to piss; that being said theres rules to follow. ::: HOW TO USE IT::: 1) The smell of urine is actually ammonia, urine; in a healthy person; is absolutely sterile and clean. 2) The stronger that ammonia smell, the less nutrients are available to plants, and less nitrogen. - Nitrogen actually binds as it sits with other chemicals to create ammonia - - After 24 hours, your going to need new urine - 3) Never pee directly on any plant, mix in a solution of water at a ratio of 10:1 or 15:1 water:urine. 4) Do NOT mix with any other bodily fluids, and do not use any other bodily fluids, including stool. - The reason for this is the human diet - 5) Urine needs to be fresh, re-read post 2. 6) Urine should be applied to the soil, consider it an untreated fertilizer; do NOT foliage feed with it. 7) The nitrogen content is really high, keep that in mind as nitrogen can inhibit flowering of "SOME" types of plants, with that being said; vegetative stages will benefit tremendously from nitrogen. 8) Direct urine can burn and kill plants undiluted; if weeds are a problem, apply undiluted directly to kill weeds, oddly will turn grass yellow, which will recover and turn greener then it was before; weeds don't recover. 9) Urine is the best composting activator you will ever find, anywhere. It will also increase the micro nutrient value of your final compost by 50-100%. 10) Collect directly into the bottle, then mix with water, not the toilet. use as you would any fertilizer and don't overdo it, you can over fertilize plants. 11) For hydroponics about 250ml for 3.5 galons will do it. :::WARNINGS::: 1) If your sick, have infections "urinary, bladder etc" do not use your urine. Urine is sterile in the bladder all the way to the exit so long as its not introduced through infections. 2) Most drugs/medications wind up in urine, if your on prescription drugs, your urine is probably off limits. The exception to this is birth control, marijuana, 90% pain killers. A study actually suggests that estrogen helps a lot of different flowering plants, Google is your friend here. 3) Do not use the urine of someone else for the first 2 reasons. You just don't know. 4) Don't use pet urine, its probably safe but there could be, and may be things in pet food your unaware of, could be unseen infections, since they cant tell you of discomfort. And some animal; such as cat; urine, is much stronger and could kill plants. 5) Lots of people feel theres a yuk factor involved, just don't tell people about your homemade super crops secret, even if it is safe. This may vary slightly based on diet, contents based on every 2L of urine "about your daily total" Nutrient Levels Alanine, total ..... 38 mg/day Arginine, total ..... 32 mg/day Ascorbic acid ..... 30 mg/day Allantoin ..... 12 mg/day Amino acids, total ..... 2.1 g/day Bicarbonate ..... 140 mg/day Biotin ..... 35 mg/day Calcium ..... 23 mg/day Creatinine ..... 1.4 mg/day Cystine ..... 120 mg/day Dopamine ..... 0.40 mg/day Epinephrine ..... 0.01 mg/day Folic acid ..... 4 mg/day Glucose ..... 100 mg/day Glutamic acid ..... 308 mg/day Glycine ..... 455 mg/day Inositol ..... 14 mg/day Iodine ..... 0.25 mg/day Iron ..... 0.5 mg/day Lysine, total ..... 56 mg/day Magnesium ..... 100 mg/day Manganese ..... 0.5 mg/day Methionine, total ..... 10 mg/day Nitrogen, total ..... 15 g/day Ornithine ..... 10 mg/day Pantothenic acid ..... 3 mg/day Phenylalanine ..... 21 mg/day Phosphorus, organic ..... 9 mg/day Potassium ..... 2.5 mg/day Proteins, total ..... 5 mg/day Riboflavin ..... 0.9 mg/day Tryptophan, total ..... 28 mg/day Tyrosine, total ..... 50 mg/day Urea ..... 24.5 mg/day Vitamin B6 ..... 100 mg/day Vitamin B12 ..... 0.03 mg/day Zinc ..... 1.4 mg/day TIPS!!!!!!!!!!!!!!!!!!!!!! I have gone though an entire grow using urine without any deficiencies, but many feel that during flowering your phosphorus levels are too low. If you desire, a bloom fertilizer may be used in tandem during the flowering phase. A tea made with the Russian comphry plant (3.6-1-10.6) is an excellent organic bloom fertilizer for those of us who do not wish to use chemicals at any step. Also a tea of bone meal, or bone meal in your soil mix is probably the best way to add Phosphorus. Your body can only absorb about 10-15% of a multivitamin/mineral pill the rest is flushed out with your urine. Taking a multivitamin/mineral about 3 hours before your urine collection can give you many vital micro nutrients. PH The PH value for human urine can range anywhere from 5 and 8.5 but most often is found between 5.5 and 7.5 in healthy individuals with a balanced diet. A value of 6 is average. High protein diets can lower PH (more acidic) and Vegetarian diets raise PH values (more alkaline). Urinary infection will increase PH value. Test your PH and lower it (coffee, lemon juice, or vinegar are great organic PH downs) if any higher that 6, especially if in a hydro system, or increase your protein consumption. If the soil you are using is fairly acidic, like peat moss you will want to make sure you are not dropping it too low with acidic urine; dolomite lime can help you buffer this up, or increase your vegetable intake and lower your protein. Pro's It Works Tried and true. In my (and a few others) opinion it works as good as commercial fertilizers when used properly. A side by side clone to clone test has not yet been done (to my knowledge), but there is no question that urine produces healthy, frosty, dank nugs, as good as anything out there. Cheap You can't beat free can you? Not likely. Weather you are growing for pleasure or profit saving money is something that I think we all desire. If you have no problem with spending the money, then go right ahead. Call it ghetto if you want, I call it natures gift, and I intend to make the best of it. Available It’s like fertilizer on tap. No hasty visits to the hydro/garden shop. No “I’ll have to do without for a while”. It’s always there when you need it. Environmentally friendly Many of us would like to preserve the earth. Well organic fertilizers are the way to go if this is part of your ethos. Chemical fertilizers are produced from petroleum products, natural gas, and coal. Minerals are made more soluble with acids. After the compounds are used by the plant the contaminants left over in the soil can become poisonous and over time can leave the land depleted and ‘dead’. Using organic fertilizers closes a cycle of life that has existed for millennia. We feed the plants and they feed us, much like the oxygen and carbon dioxide cycle. :::Con's::: Salt content Human urine will contain various salts. Depending on diet your urine can contain up a max of 2.2% salt, this is because the human kidney cannot concentrate salts to greater than 2.2%. On average salt content will be about 30g/L Total dissolved solids constitute about 5% of urine volume. As previously stated it will be to your benefit to allow some run off when watering and toss it, this will rid your soil of excess salts. Imprecise Urine fertilizing is not an exact science. Exact nutrient levels and concentrations cannot be accurately established without the proper equipment. Notwithstanding some trial and error is necessary in every fertilizer regiment. Certain strains can have differing tolerances, different growing conditions and methods vary in their ability to deliver nutrients reliably.