Using Urine Fertilizer
for the Garden

Urine fertilizer primarily provides nitrogen. How much nitrogen does a garden need? According to the state of Illinois, here is the amount of nitrogen needed by the following plants:

  • Asparagus: 300 pounds N per acre per year
  • Beets: 100 pounds N, 60 pounds Phos, 85 pounds Potassium
  • Broccoli: 200 pounds N per acre per year
  • Cabbage: 100 pounds N per acre per year.
  • Carrots: 100 pounds N per acre per year
  • Cauliflower: 200 pounds N per acre per year
  • Cucumbers: 35 pounds N per acre per week
Green Peppers are an easy crop to grow
  • Green peppers: 130 pounds N per acre per year. Too much can cause blossom end rot
  • Pumpkin: 60 to 100 pounds N per acre per year
  • Radishes: 50 pounds N., 100 pounds Phos, 100 pounds Potassium per acre per year
  • Sweet potatoes: 110 pounds N, 200 – 250 pounds potash per acre per year
  • Tomatoes: 150 to 200 pounds N per acre per year. Too much causes blossom end rot.
  • Watermelon: 150 pounds N per acre per year. Too much causes blossom end rot.
  • Zucchini: 100 pounds N per acre per year


Click here for a list that covers more crops. The numbers above are for commercial growers who use chemical fertilizers. Since I use organic methods, I don’t need nearly this much supplementary nitrogen. However, at least this list shows which plants require more nitrogen and which require less.


A Unique Fertilizing Technique

Here’s a great way to use urine fertilizer in the garden. Mulching items such as mulched leaves or wood chips are rich in carbon and contain phosphorus and potassium, but very little nitrogen. Mulches need nitrogen to help break them down. When mulches are combined with nitrogen, they provide the major nutrients for my garden. So here is what I like to do.

My mulch, gathered from the woods behind my house, will make a nice mulch for my garden

Planting through mulch

First, to help suppress weeds, I spread a single layer of non-glossy newspaper over the ground (which I didn't do in the picture). Next, I add mulch to a depth of 4 inches. Then I use my little gardening shovel to move the mulch aside, punch a hole through the newspaper, and make a shallow hole in the soil. Next, I sow or transplant into the dirt. I don’t move the mulch back against the plant until the plant grows above it.


Mulch complements the nitrogen in urine

I planted French Green Beans into the compost

Once I have planted, I like to apply humic acids and sea minerals over the top. The humic acids help with germination, and help to break down the salts in my urine fertilizer. They also cause the mulch to begin decomposing, which releases phosphorus and potassium to my garden. The sea minerals provide needed trace minerals. An ounce of humic acid and a teaspoon of concentrated sea minerals, diluted with water, treats about 200 square feet of mulched garden.

Next, I put some of my day’s urine fertilizer into my watering can, fill it with water, and use it to water the mulch. The mulch helps to protect the roots from the high nitrogen content of the urine, and the urine provides nitrogen needed to slowly compost the mulch right in my garden.


How much urine fertilizer does my garden need?

As a ballpark figure, a liter of urine will treat 350 square feet of garden space (4' x 88') if done weekly over 7 months. By the end of 7 months, you will have applied 100 pounds of nitrogen per acre.

Increase or decrease application according to individual plant needs, as listed above. More urine may be applied when plants are in the growth stage, and less when they are putting on fruit. Use more for plants such as cucumbers, squash, tomatoes and corn that need more nitrogen to put on fruit. Use whatever urine is left over to fertilize bushes, trees or lawn.

If leaves are yellow or pale green, they probably need more nitrogen. Too much nitrogen can cause plants to produce a lot of leaves but bear little fruit. It can also cause leaves to curl, and make plants more prone to insect attack. Please visit my home page, Healthy Vegetable Gardening. Happy gardening!

(Return from Urine Fertilizer to Organic Vegetable Garden)


I appreciate your input.

Please share your insights in the box below.

Human Urine
as Fertilizer

1, 2, 3, 4


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