Mulch Decomposition Rule of Thumb

I made a chart and in the process learned that as a rule of thumb mulch C:N more or less follows an exponential time decomposition rate for carbon. Your decomposition time will vary depending on location temperature, latitude etc.

mulch-decomposition-rate

I based it on carbon decomposition rate data I could find, and Australian Native Forests and Plantations.

My conclusion is;

  1. build soil with with grass/legumes/compost/green leaves in the first year.
  2. add leaf litter in the second year.
  3. add twig & bark in the third year.
  4. add branch in the fourth year.
  5. add sapwood in the fifth.
  6. add heartwood in the sixth.

Basically; grow to chop and drop and by year 7 your soil will be awesome.

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