1. Biogas slurry is used as a base fertilizer on its own. In autumn, the biogas residue that is directly taken from the bottom of the biogas digester has a solid content of approximately 10%. This material can be directly applied to the surface of the field and immediately incorporated into the soil through plowing. This method ensures that the nutrients from the biogas fertilizer are quickly absorbed by the soil. The fertilizing effect is roughly comparable to that of an equivalent amount of animal manure. It is recommended to apply between 1000 to 2000 kg per 667 square meters (about one acre). If this practice is continued for three years, it can significantly increase the organic matter content in the soil and help build a thicker, more fertile soil layer.
2. When using biogas slurry as a top dressing for crops, it's best to apply around 1000 to 1500 kg per 667 square meters. The process involves digging small holes around the root zone of the plants, watering the slurry into these holes, and then covering the soil. This technique helps improve nutrient absorption and enhances the overall efficiency of the fertilizer. It is especially effective for crops that require additional nutrients during their growing season. By using biogas residue in this way, farmers can reduce their reliance on chemical fertilizers while maintaining or even improving crop yields. Additionally, this method supports sustainable agricultural practices by recycling organic waste into valuable resources.
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