a. Particle size of raw materials: in order to achieve the granulation particle size of organic fertilizer granulator, the particle size of pig manure and auxiliary raw materials should be less than 10 mm, otherwise they need to be crushed;
b. Suitable material moisture: the optimum fermentation humidity of composting microorganisms is 50 ~ 60%, and the limit humidity is 60 ~ 65%. Therefore, the moisture content of composting materials should be adjusted to 55 ~ 60%. When the moisture content is more than 65%, there is a higher probability of dead tank fermentation.
c. Control of pig manure and auxiliary materials: according to the local agricultural conditions, the production process of pig manure fertilizer can use straw, corn stalk, peanut stem and other organic materials as auxiliary materials. The ratio of pig manure and auxiliary materials can be adjusted according to the requirements of fermentation moisture. (generally 3:1), the raw materials with carbon nitrogen ratio of 20 ~ 80:1 can be selected as the auxiliary materials for composting. Therefore, dry rice straw, corn stalk, deciduous leaves, soybean stem, peanut stem and other organic substances commonly used in rural areas can be used as auxiliary materials for composting and fermentation.
d. Fermentation cycle: after the pig manure, auxiliary materials and inoculated materials are mixed in the tank, the first turning is recorded as the start time of the fermentation cycle. Generally, it goes through a heating period of 3-4 days (5-7 days in winter) to enter the high-temperature fermentation stage. According to the temperature standard, when the temperature of the compost is over 60-70 ℃ for more than 24 hours, the compost windrow turner can be used to turn the pile, and the turning times vary with the seasons. The fermentation cycle is 15 days in summer and 25 days in winter.
e. If it is found that the temperature in the fermentation tank does not exceed 40 ℃ after 10 days in the tank, it can be judged as dead tank and the fermentation start-up fails. At this time, it is necessary to measure the water content in the tank. If the moisture content is more than 60%, it is necessary to add auxiliary materials and inoculating materials and mix them with organic fertilizer machine; if the moisture content is lower than 60%, consider whether the amount of inoculated materials is not enough.
After the pretreated livestock manure enters the organic fertilizer stirring and fermentation device for fermentation, an appropriate amount of nitrogen, phosphorus, potassium and other elements are added according to a certain proportion to make the trace elements meet the organic fertilizer production standard, and then the livestock manure is processed into high fertilizer efficiency, convenient transportation and Use safe and affordable organic fertilizers.