I read that Goji berries fix 60lbs of nitrogen in the soil per acre, does this mean that one plant will put 60 lbs into the soil, or do i need many plants to do this?

  • The title of your post is asking a completely different question from the body. Do you want a definition of nitrogen fixation, or do you want to know how many goji plants you need to fix a given amount of nitrogen?
    – Niall C.
    Sep 7, 2020 at 21:50
  • the question is completely about nitrogen fixing in the soil Sep 7, 2020 at 22:03
  • A quick web search suggests that for commercial growing you would plant about 600 bushes per acre, so each bush is going to fix about 1 1/2 ounces of nitrogen per year. 60 lb per acre is a low figure for plants grown specifically to fix nitrogen.
    – alephzero
    Sep 7, 2020 at 22:12

1 Answer 1


If you are thinking that planting lots of plants with nitrogen fixing roots will increase nitrogen levels in your soil while they are growing, they will not. They will increase nitrogen levels IF you turn them into the soil - as they degrade (no longer functioning or growing) they will then release the stored nitrogen, see here https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/nitrogen-nodules-and-nitrogen-fixing-plants.htm#:~:text=As%20these%20plants%20decompose%2C%20they,beneficial%20symbiotic%20relationship%20with%20bacteria.

  • how do fruit trees, and bushes fix nitrogen into the soil then if they're not tilled into the soil? Sep 7, 2020 at 23:24
  • They don't - they hold onto it in their roots while they live,clover being a good exampleof that process.
    – Bamboo
    Sep 8, 2020 at 11:46
  • Why don't they say that it's nitrogen building, not nitrogen fixing or something similar then? Sep 8, 2020 at 17:24
  • I just came across this article on nitrogen fixing trees from a reputable source: permaculturenews.org/2015/10/20/…. Sep 8, 2020 at 17:30
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    What about bean plants, I have heard (not from reputable source) that they don't need fertilizing because they "inject" their own nitrogen into the soil... not true? Sep 9, 2020 at 4:34

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