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The quality of the biological fertilizer was based on the population of inoculated microorganism. The important efforts made to increase the population and maintain the population of microorganisms during storage was using the best carrier. The aim of this study was to measure the population dynamics of some microbes due to the application of various types of earthworms in producing biofertilizer. The study was conducted in Biology and Biotechnology Soil Laboratory, Department of Agriculture, Universitas Sumatera Utara. The design used was a Factorial Randomized Block Design consisting of 2 factors. The first factor was a type of earthworm with 4 treatments viz; without earthworm, anecic earthworms, endogeic earthworms, and epigeic earthworms. The second factor was a type of microorganism inoculants with 6treatments, viz; Azotobacter sp., Azospirillum sp., Bacillussubtilis, Trichodermapinophilus, Talaromyces asperellum, and Syncephalastrum racemosum. The results showed that there was a significant interaction between the types of earthworms in influencing the population of each microorganisms in the medium. The highest alteration of microbial population was found in Azotobacter sp. and Trichodermaasperellum. The best type of earthworm that could be used on the inoculum medium was the epigeic earthworm.

proceedings of the international conference of science, technology, engineering, environmental and ramification researches

Population Dynamics of Azotobacter sp., Azospirillum sp., Bacillus subtilis, Talaromyces pinophilus, Trichoderma asperellum, and Syncephalastrum racemosum in the Medium with Various Earthworm Applications