I have a 20 liter bucket of liquid fertiliser. I mixed some grass clippings and some twigs and branches and added saltpetre, gypsum, and epsom salts to it.

I must say I was surprised at how terrible the smell actually became. I thought it was going like wet earth and decaying plant matter but it really just smelled like sewage.

This bucket has been happily festering away for nearly a year. I was wondering if I bought some activated carbon and mix a water solution with this liquid fertiliser and till this into the soil in preparation for sowing if that would do anything?

  • You left out used coffee grinds and crushed egg shells. But why not just dilute and water the soil as is? Feb 9 at 13:05
  • I thought the porous nature of the carbon would slow release the nutrients into the soil over a long time.
    – Neil Meyer
    Feb 9 at 13:26
  • Is there anything else in the liquid other than the grass clippings, twigs, branches, saltpetre, gypsum, and epsom salts?
    – MackM
    Feb 9 at 14:12
  • What kind of soil would you be tilling the carbon into? Sandy? Clay?
    – MackM
    Feb 9 at 14:13
  • 1
    1. Gypsum can harm non-ag soils: s3.wp.wsu.edu/uploads/sites/403/2015/03/gypsum.pdf. 2. Epsom salts are useless and/or can harm non-ag soils: s3.wp.wsu.edu/uploads/sites/403/2015/03/epsom-salts.pdf 3. Get a soil test before you do anything to your soil. 4. Charcoal is at best a useless add-in, which is why it's not in commercial fertilizers. 5. Go here: puyallup.wsu.edu/lcs and read all of the white papers on the site.
    – Jurp
    Feb 9 at 14:41


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