Compost has the ability to enrich soil with beneficial invertebrates that stimulate the growth of soil organisms. The zoological population influences the physical, chemical, and microbial factors in soil. Some zoological populations in the mixture of sludge, bulking agent, and amendment survive the composting process. They penetrate the compost pile when temperature decreases to 30 to 35°C during the cooling stage. When the compost is stored, the zoological populations increase. The number of species in the cured compost can increase to more than 200. Some scientists are of the opinion that by determining the zoological population in the compost, one can predict how much biological activity occurs in the soil when the compost is applied to the soil.
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