1, material ratio. ? 1.5 tons of cow dung (about 3 tons of fresh dung), plus 1 kg Gymboree starter, should be evenly mixed with rice bran according to the ratio of 1: 5, and then evenly sprinkled into the cow dung pile and stirred evenly. It is best to add 25% straw or mushroom residue to adjust the carbon-nitrogen ratio.
2. Material stacking. When making a pile, it should not be too small or too short, which will affect the fermentation. The fermentation effect of flat-topped trapezoidal heap with a height of 1.2 m ~ 1.5 m, a width of 2 ~ 2.5 m and a length of more than 2 ~ 4 m is better.
3. Temperature requirements. The initial temperature should be above 15℃ (it can be operated in all seasons and is not affected by the climate and temperature in the north and south seasons. Try to start fermentation indoors or in a greenhouse in winter, and start fermentation in cold areas such as Northeast China according to the method guided by technicians).
4. Humidity requirements. The moisture content of fermented materials should be controlled at about 60%. Too high or too low is not conducive to fermentation, too little water, slow fermentation; Too much water will lead to poor ventilation, slow temperature rise and odor. Method for adjust that water content of material: if the water content is too high, organic dry materials such as rice straw powder, mushroom residue and bran can be adde. Judgment method of moisture suitability: hold a handful of materials tightly, and it is appropriate to see the watermark between your fingers without dripping, and it will spread when you land.
5. Turn over the pile for ventilation. Pay attention to proper oxygen supply and turning over during fermentation (when the temperature rises to 60 ~ 70℃ or above, it should be turned over in time, usually 2 ~ 3 times), and the temperature should be controlled at about 65℃. Too high a temperature will have an impact on nutrients.
6. Fermentation is completed. Generally, the fermentation can be completed within one week, the material is dark brown, and the temperature begins to drop to normal temperature, indicating that the fermentation is complete. If there are too many auxiliary materials such as straw and mushroom residue and the cellulose content is high, the fermentation time should be extended until it is completely decomposed.