Biogas fertilizer is a rich source of nutrients that can significantly enhance soil fertility and microbial activity. It improves the soil's water retention, aeration, and heat regulation, making it more suitable for plant growth. However, some farmers tend to apply all the biogas fertilizer at once, which reduces its effectiveness. To maximize benefits, it's important to separate the biogas slurry into three distinct layers—upper, middle, and lower—and apply them according to the specific needs of different crops.
The upper layer is a liquid fertilizer high in nitrogen, which is easily absorbed by plants. It’s ideal for early fertilization of crops like wheat, corn, cotton, and vegetables. Before using it, it’s recommended to store this layer in a secondary tank for 6–7 days to reduce its reducing properties or dilute it with water to avoid over-concentration.
The middle layer is a thick, paste-like fertilizer rich in nitrogen, phosphorus, organic matter, and humus. It provides balanced nutrition and is suitable for medium-term application on crops such as wheat, corn, cotton, peanuts, fruit trees, and vegetables. This layer helps promote lush foliage, strong stems, and better grain development.
The bottom layer is known as biogas residue, containing organic matter, humus, and mineralized phosphorus and potassium. It serves as an excellent base fertilizer for a wide range of crops including wheat, corn, cotton, peanuts, fruit trees, vegetables, and flowers. When applying, it should be evenly spread on the soil surface and incorporated into the topsoil through plowing. After earthworms are introduced, the fertilizer mixes well with the soil, enhancing nutrient availability. However, it’s crucial to let the residue sit for 15 days after being removed from the digester before application to ensure stability and prevent any negative effects on plant growth.
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