The speed at which organic materials decompose depends on the decomposers, type of organic materials and composting method used. The food web of the compost pile on page 4 shows the relationships in the process. Aerobic vs. anaerobic microorganisms . They are the preferred microorganisms since they provide the most rapid and effective composting. Anaerobic microorganisms thrive when the compost pile is oxygen deficient.
Anaerobic conditions are undesirable.
The products of anaerobic decomposition cause compost piles to smell badly. Aerobic bacteria are the most important initiators of decomposition and temperature increase within the compost pile. The initial temperature of the compost pile is usually related to air temperature. At temperatures below 70EF, helpful bacteria do not thrive. Temperature changes during the process depend on materials being composted, compost method and the water available.