4 Good Reasons to Fertilize with Urine

Why Use Human Urine as Fertilizer?

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Although the initial reaction of many people to using human urine as fertilizer is "Ew!" "Yuck!" and "Gross!" more and more earth-friendly gardeners are giving it a try.

And why not?

"Liquid gold," as it's sometimes called, is safe, virtually free and environmentally sound.

Best of all, it works!



Why Urine Is #1

Unlike humanure (compost made from human feces) liquid fertilizer made from human urine is easy to make.

Although humanure is becoming increasingly popular with organic gardeners, turning feces into safe, usable compost is a time-consuming process.

Not only can urine be diluted with water and used as a liquid fertilizer, but it can also be added in undiluted form to compost piles and compost bins. It can even be poured directly onto straw bales that will be later used as compost.

Have you tried using urine as fertilizer?

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Good Reasons to Use Urine Fertilizer

1. Urine contains the nutrients plants need.

Human urine contains three nutrients that are essential to plant development and growth: nitrogen (N), phosphorus (P) and potassium (K), the same ingredients that are in most bags of fertilizer.

According to micturition expert Hakan Jonsson of the Swedish University of Agricultural Studies, when we create urine, our bodies break complex organic matter into the basic mineral form plants like best (Grunbaum). In other words, pee and plants were made for each other.

A study conducted in 2007 at the University of Kuopio's Department of Environmental Sciences in Finland reveals the effectiveness of urine as fertilizer for cabbage, which requires high amounts of nitrogen in order to grow well (Colwell).

In 2010, research scientists Surenda Pradhan and Helvi Heinonen-Tanski raised beets using various types of fertilizer. Plants that received human urine in conjunction with wood ash produced significantly larger beets than those fertilized with any other type, including mineral fertilizer. And, of course, there was no difference in the nutritional value or taste of the beets (Grunbaum).

3 STEPS TO MAKING LIQUID FERTILIZER FROM URINE

For those who are open to human urine as an inexpensive and effective form of fertilizer, an easy method for using it follows. Although an entire book could be (and has been) devoted to the subject, pee-cycling at its most basic requires only three steps.

Step 1: Collect urine.

Instead of urinating into the commode and flushing all that good plant food away, pee into a plastic gallon milk jug or some other resealable container. If you’re a woman, this could prove messy, so make it easy on yourself. Use two milk jugs. Cut the smaller one in half, reserving the top to use as a funnel for the larger jug. To trap odor, plug the hole with a wine cork (Steinfeld 22).Whatever sort of container you choose to use, be sure to keep it sealed. Pee stinks!

Step 2: Add water.

So that it won’t burn plants, human urine must be diluted before it’s used as fertilizer. Add at least eight parts water to one part urine. (Some gardeners recommend a ratio of 20 to one.) (Pleasant 73). You may have to experiment a bit in order to find the mix that’s right for your garden.

Step 3: Apply to plants.

Apply the wee brew no more than once every two weeks to turf grass, vegetables, fruit trees, bushes and container plants—anything you grow. Like any water-soluble fertilizer, pee tea is faster acting than solid fertilizer. It’s also shorter acting, so you don’t have to worry about over-fertilizing if you limit your use to biweekly applications.

2. Human urine is safe to use.

Unlike human feces, human urine is virtually sterile. That means it contains few, if any, pathogens (disease-causing microorganisms). Any pathogens that do exist in urine become harmless over time.

To make sure there are no pathogens in your pee tea, allow the urine you collect to age up to six months before use.

3. Using urine as fertilizer is ecologically sound.

According to the U.S. Geological Survey’s website, the average U.S. citizen uses between 80 and 100 gallons of water per day, mostly from flushing toilets (“Water Use at Home”). If you live in a home built before 1992, you probably use 3.61 gallons of water every time you flush. If you have a newer, water-conserving toilet, it probably uses 1.54 gallons per flush (California Urban Water Conservation Council).

Just think how much water you would save if you “harvested” your urine regularly instead of flushing it. Even if you have a water-conserving toilet and flush urine only five times daily, you’d save 7.7 gallons per day, 53.9 gallons per week, about 231 gallons per month and 2,810.5 gallons per year. For a family of four, that’s 11,242 gallons of water per year, 26,353 if your home has a non water-conserving commode. That’s a lot of water—enough to fill a large swimming pool! Of course, if you create liquid fertilizer with urine, you’ll have to use water, too, but it will be put to good use, not just flushed away.

4. It’s readily available.

Most people produce about a quart and a half of urine per day (Pleasant 75). Diluting at a ratio of one part pee to 20 parts water, most families could easily produce enough “liquid gold” to fertilize their garden and yard throughout the growing season.

Works Cited

California Urban Water Conservation Council. "Take Action: Toilet Water Use." H2ouse: Water Saver Home. 27 May 2011. Web.

Colwell, Carolyn. "Human Urine Safe, Productive Fertilizer." 8 October 2007. The Washington Post. 27 May 2011. Web.

Grunbaum, Mara. "Pees and Carrots: Researchers Say Human Urine Works Great as Sustainable Fertilizer." 23 July 2010. Science Line. 27 May 2011. Web.

Pleasant, Barbara. "Free, Homemade Liquid Fertilizer." Mother Earth News February/March 2011: 72-75. Print.

Steinfeld, Carol. "You Can Compost Human Waste!" Mother Earth News April/May 2011: 22. Print.

"Water Use at Home." 16 February 2010. USGS. 27 May 2011 Web.

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Comments 13 comments

The Dirt Farmer profile image

The Dirt Farmer 3 years ago from United States Author

Here's what an article on the Ecologist website (http://www.theecologist.org/green_green_living/gar... says, Oden: "Antibiotics, vitamin supplements and other medications will end up in your urine, but in such minute quantities as to be negligible, especially when diluted in water." That makes sense to me. After all, using urine in the garden doesn't mean peeing in your vegetable patch. It means collecting it, letting it age to kill pathogens and then diluting it a good bit.


The Dirt Farmer profile image

The Dirt Farmer 3 years ago from United States Author

I'll look into it, Oden, and get back to you. I remember reading something about the urine of some women on medication, but can't remember the details now. --Jill


Oden 3 years ago

I am wondering if it is safe to use urine from people who take medications. Would minute amounts fo medication contaminate the vegetables causing other problems for those who consume them?


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

Thanks for commenting, Eddie! (And for the vote up.) Have a good one! Jill


Eiddwen profile image

Eiddwen 4 years ago from Wales

A great hub here which I vote up plus bookmark.

Take care and enjoy your day.

Eddy.


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

Absolutely, Maren! A garden shed is definitely needed. Of course, urine can also be composted. Pour it straight into hay bales and compost piles rather than mix it with water. Thanks for commenting! Jill


Maren Morgan M-T profile image

Maren Morgan M-T 4 years ago from Pennsylvania

Thanks for all your citations. I see the 6-month storage as the biggest challenge.


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

@ Healthy Pursuits & chefsref--Thanks for the "testimonials," you guys! Hope you inspire other readers to try "liquid gold."

@snell--Thanks for commenting! Glad you stopped by. --DF


The Dirt Farmer profile image

The Dirt Farmer 4 years ago from United States Author

Good for you, jesimpki! Thanks for commenting. DF


chefsref profile image

chefsref 4 years ago from Citra Florida

Hey DirtFarmer

Very useful article, I've been using urine for fertilizer for a few months now. It's important to remember to dilute it with plenty of water, 5 to 10 times as much water as urine, otherwise it can burn tender roots and destroy plants. The nitrogen boost does wonders for leafy green stuff and my broccoli is twice as large as the broccoli grown with bagged fertilizer.

I'm also trying urine on compost, I have lots of oak leaves which can take years to break down, hopefully this will speed the process as my soils is sandy and needs all the help it can get


snlee profile image

snlee 4 years ago from Asia Pacific Regions

urine has been commonly used by peasant farmers China...natural and organic resources.


Healthy Pursuits profile image

Healthy Pursuits 4 years ago from Oregon

I agree totally! I've used my urine in my garden and had wonderful results. Letting it age is important.


jesimpki profile image

jesimpki 4 years ago from Radford, VA

Very informative and well put! I always fertilize my garden, especially my tomatoes with my own urine. I can understand why some people are grossed out by it, but the way I see it, I'm not spraying the fruit themselves, so no harm done!

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