Summary of The Three
Stages of Composting:
Oxygen Stage
When the windrow is formed microorganisms
consume
oxygen (aerobic decomposition.)
As oxygen is used up aerobic decomposition
slows down. Aeration is provided
by mechanical
turning to add oxygen
and replenish pore space
within the settled medium.This promotes air
movement through the windrow.
Temperature Stage
Temperature increases due to microbial activity
in the windrow.The temperature increases to
40-60 C and generally is maintained for several
weeks. As aerobic decomposition slows the
temperature drops off.
Curing Stage
When
the aerobic decomposition has slowed
the curing phase has begun.Oxygen usage is
so slow the windrows don't need to
be turned
anymore. As the temperature drops to that
of
ambient air the compost is done.
(AgTech Centre)
