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Seeing as a lot of people around the world urinate against trees it came to mind that I never thought about how the tree responds to this. Is it detrimental for a tree if people urinate against them?

When looking on the internet, I found this explanation about urine:

Human urine consists primarily of water (91% to 96%), with organic solutes including urea, creatinine, uric acid, and trace amounts of enzymes, carbohydrates, hormones, fatty acids, pigments, and mucins, and inorganic ions such as sodium (Na+), potassium (K+), chloride (Cl-), magnesium (Mg2+), calcium (Ca2+), ammonium (NH4+), sulfates (SO42-), and phosphates (e.g., PO43-). What Is the Chemical Composition of Urine?

Of course, it is possible that the small amounts present in urine are negligible in contrast to the amounts a tree absorbs on a daily basis. What I am wondering: is the chemical composition of urine detrimental or beneficial for a tree?

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    $\begingroup$ Tom, this is a wonderful improvement from your previous [now deleted] post, and I'm glad you took the time to do some of your own research and include it here. Really great to see the newly added effort! Thanks! +1 $\endgroup$ – theforestecologist Mar 7 at 20:12
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    $\begingroup$ related. Also, my +1 to this question and @theforestecologist comment was not enough to express how much the improvement in this question is appreciated. I wish I could upvote again... $\endgroup$ – De Novo Mar 9 at 0:15
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    $\begingroup$ In most instances, plants benefit from animal litter, which is why it is sprayed in fields, and used to get bigger crops. Everything in moderation obviously, there is an optimum influx of animal litter which increases plant growth, which in the case of humans weeing, is much lower proportion than cows. other human activities are a lot more detrimental to trees, i wouldn't worry about weeing on them. a big tree can probably benefit from about 1 cubic meter of wee before it got detrimental. ideally you have to keep the pH at about 6.4 $\endgroup$ – com.prehensible Apr 17 at 0:55
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    $\begingroup$ a large tree can probably benefit from about 1 cubic meter of wee for a year before it gets detrimental, but not in the same place at the same time. $\endgroup$ – com.prehensible Apr 17 at 0:56
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    $\begingroup$ Indeed. for cow urine here is a study: scielo.br/img/revistas/hb/v27n4/06t01.gif $\endgroup$ – com.prehensible Apr 18 at 8:59
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Here is a book about dry-matter production of urine treated plants. If we consider that trees are large plants, it's fair to apply the study to trees too:

The findings of the study suggested that urine and urine products are equally as effective as mineral fertilizer especially in sandy soil and that splitting the application is a useful strategy to manage urine and urine products for optimum dry matter production.

Some plants do live in harsh environments with chalky pH and other specifics, and they may weakened by it. It's safe to say most trees are unaffected or improved by some urine, although the biggest trees are because of rain and steady underground streams (groundwater).

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    $\begingroup$ but just like anything in biology amounts matter, if enough people urinate against a tree it can cause salinity issues. But you need a ridiculous number of people to cause that. Note dog urine is far more concentrated so it can reach the problem levels much faster, trees visited by dozens of dogs in a day suffer for it. $\endgroup$ – John Apr 18 at 13:47

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