Study on maturity indexes in silkworm excrement aerobic composting

Compost maturity is the main parameter to evaluate the composting process and compost product quality, but research on maturity indexes of silkworm excrement composting was seldom. To explore the rapid evaluation system of maturity about silkworm excrement composting, the model of static -aerobic composting was adapted to three types of compost, the main composting material was silkworm excrement, and the conditioners were spent mushroom compost and chaff, then investigated the change rules of physical, chemical and biological properties, and made a correlation analysis on various indicators. The results showed that when the germination index reached 80% or above, C/N and T value dropped to 12.7 and 0.76, the compost color became black, the smell disappeared, and the temperature dropped to normal temperature, the silkworm excrement would become thoroughly decomposed. So that the color, smell, temperature, C/N, T value and germination index of silkworm excrement composting were close related to the maturity of silkworm excrement aerobic composting, and could be used as the rapid evaluation indexes of maturity of silkworm excrement aerobic composting.