Soil balls were prepared by combining 450 g loess, 25 mL of
EM solution, 25 g EM bokashi mixture, to give a final weight
of 500 g. The EM bokashi mixture was added to increase
bioactivity and was prepared as follows: 500 g rice bran was
combined with 500 μL molasses (DUKSAN Co., Seoul, Korea)
and 2 mL EM solution, and then incubated at 30 °C for
2 weeks. After combining loess and EM bokashi, the mixture
was molded into sphere balls and further incubated at 30 °C
for 6 days for microbial growth.