The fermented compost of pig manure organic fertilizer should be sold as a product and processed according to the use and market needs. The purpose of composting is to improve the fertilizer efficiency and commerciality of the compost product, thereby improving the overall economic benefits.

What issues should be paid attention to when fermenting pig manure organic fertilizer:

a. Raw material particle size: In order to achieve the granulation size of the organic fertilizer granulator, the particle size of pig manure and auxiliary raw materials must be below 10mm, otherwise it needs to be crushed;

b. Appropriate material moisture: the optimum fermentation humidity for composting microorganisms is 50-60%, and the limit humidity is 60-65%. Therefore, it is best to adjust the material moisture to about 55-60%. When the moisture reaches more than 65%, there is a higher probability of dead tanks and no fermentation. c. Pig manure and auxiliary materials control: According to local agricultural conditions, the production of organic fertilizer can use organic matter such as straw, corn stalks, peanut stems as auxiliary materials. The ratio of pig manure and auxiliary materials can be adjusted according to the requirements of fermentation water. (Generally 3:1), the composting auxiliary materials can choose the raw materials with a carbon to nitrogen ratio of 20~80:1. Therefore, the common dry straw, corn stalk, fallen leaves, soybean stems, peanut stems and other organic matter can be used as auxiliary materials for composting and fermentation after being crushed.

d. Fermentation cycle: After pig manure, auxiliary materials and inoculation materials are mixed in the tank, the first time is turned over, and it is recorded as the start time of the fermentation cycle. Generally, it enters the high-temperature fermentation stage after 3~4 days of heating period (5~7 days in winter) . Taking the temperature as the standard, when the temperature of the pile body exceeds 60-70℃, keep it for more than 24 hours, and the compost fertilizer production machine can be used to turn the pile. The number of turning the pile varies with the season. The summer fermentation period is generally 15 days, and the winter fermentation period is 25 days.

e. If 10 days after entering the trough, it is found that the temperature in the fermentation trough has not exceeded 40°C, it can be judged as a dead tank and fermentation start-up failed. At this time, the moisture in the trough must be measured. If the moisture exceeds 60%, auxiliary materials and inoculation materials need to be added, and the organic fertilizer machine is mixed; if the moisture is less than 60%, consider whether the amount of inoculation materials is not enough.