The ATP level and the number of mesophilic bacteria, thermophilic bacteria, moulds and yeasts were examined in different composts prepared from lupine (Lupinus angustifolius cv Mirela). During the first weeks of composting, the mesophiles increased slowly and the thermophile phase follows. After eight weeks of composting the number of thermophiles decreased rapidly and development of mesophilic bacteria and fungi was observed. From five ATP extraction methods, the best results were obtained from Celsis-Lumac extracting mixtures and it was chosen for further experiments. The ATP level increased at the beginning of composting and decreased after 8 weeks of the process. After this time, ATP content began to rise to the achieved maximum during the 12th week of composting. There is no correlation between the number of microorganisms in compost and the ATP level.
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