Go to the agricultural technology station to buy E-M bacteria and Bacillus subtilis and mix them with water to make cake fertilizer. Humidity should be condensed by hand, and it is better to disperse at the touch. Then, the length of composting time depends on the temperature. If the temperature drops, keep warm to facilitate rapid fermentation. Stir it again when it is hot. Usually we can use it after 5- 10 days. Fermented food has a sweet taste.