Steps in the organic fertilizer production line that may cause a product to fail include:

1. Improper selection of raw materials: If the raw materials used do not meet the standards, such as containing too much harmful substances or insufficient nutrients, it will directly affect the quality of the final product.

2. The fermentation process is not strictly controlled: fermentation is a key step in the production of organic fertilizer. If the temperature, humidity, ventilation and other conditions are not properly controlled, it may lead to insufficient decomposition of organic matter, affecting the maturity and safety of the product.

3. Production process problems: Improper operation in the production process of organic fertilizer equipment, such as crushing, mixing, granulation and other steps, may lead to poor product uniformity, particle size, and unequal distribution of nutrients.

4. Poor control of pollutants: In the production process, if the control of pollutants such as heavy metals and harmful microorganisms is not strict, it may lead to excessive content of harmful substances in the product.

5. Inaccurate product testing: Product testing before leaving the factory is an important link to ensure product quality. If the testing method is inaccurate or the testing frequency is not enough, it may lead to unqualified products entering the market.

6. Improper storage and transportation: In the process of storage and transportation, if the conditions are not properly controlled, such as moisture, heat or pollution, it may also lead to product deterioration or quality reduction.

In order to ensure that the products of the organic fertilizer production line are qualified, it is necessary to carry out strict quality control for each of the above links, and follow the relevant national standards and industry norms.