In modern agriculture, the use of organic fertilizer has received more and more attention, and composting fermentation, as an important production method of organic fertilizer, has become a hot topic among farmers and soil scientists. In this process, the generation of high temperature is a phenomenon that cannot be ignored. So, why does high temperature occur during the composting fermentation of organic fertilizer?

In the aerobic stage of composting, microorganisms rely on oxygen to decompose organic matter. This process releases a lot of heat, causing the temperature inside the compost to gradually rise. Therefore, on the basis of understanding the fermentation process, we can better understand the temperature changes during the composting process.

1. Initial temperature rise: In the early stage of composting, the temperature will rise rapidly to 40-60℃, which is the result of the massive reproduction and metabolic activity of microorganisms. At this time, the organic matter inside the compost is rapidly consumed, especially the decomposition of the carbon source is abnormally rapid.

2. High temperature stage: When the compost temperature reaches 60-70℃, the compost enters the high temperature stage, which usually lasts 2-3 weeks. At this stage, many types of pathogens and grass seeds will be eliminated, effectively improving the hygienic properties of the compost. At this stage, the types of microorganisms change significantly, and some high-temperature resistant bacteria will replace the original microorganisms.

3. Cooling and maturation: After a period of high-temperature fermentation, the temperature of the compost will gradually drop and eventually reach maturity. At this time, the microbial community inside the compost will tend to be stable, and the consumption of energy sources will be greatly reduced. Mature compost usually has good soil improvement properties and is rich in nutrients, which is an important supplement to farmland.