1. Biogas slurry is used as a base fertilizer on its own. In the autumn, the biogas residue taken directly from the bottom of the digester has a solid content of approximately 10%. This material can be applied directly 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 effectively introduced into the soil. The fertilizing effect is 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). After three years of continuous application, this practice can significantly increase the organic matter content in the soil and help build up a richer topsoil layer.
2. When using biogas residue as a top dressing for crops, it is advisable to apply around 1000 to 1500 kg per 667 square meters. The best method is to dig small holes around the root zone of the plants, pour the biogas residue into the holes, and then cover them with soil. This technique helps improve nutrient absorption by the roots and enhances the overall efficiency of the fertilizer. It is especially beneficial for crops that require a steady supply of nutrients during their growing season. Regular use of biogas residue as a top dressing not only supports plant growth but also contributes to long-term soil health and sustainability.
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