Technical overview:

Biogas residue and biogas slurry are collectively referred to as biogas manure. They are products of pig, cow, sheep manure and human manure after being fully fermented in biogas digesters. Biogas residue mainly contains: 30%~50% organic matter, 10%~20%, total nitrogen 0.8%~2%, total phosphorus 0.4%~1.2%, and total potassium 0.6%~2%. The total solid content of biogas slurry is less than 1%, and contains 0.04% available nitrogen, mainly available nutrients. In addition to being rich in nitrogen, phosphorus, potassium and other elements, biogas manure also contains trace elements such as boron, copper, iron, manganese, calcium, and zinc that play an important role in the growth of crops, as well as a large amount of organic matter, various amino acids and vitamins. The application of biogas fertilizer can not only significantly improve the soil and ensure a good microecological environment required for crop growth, but also help enhance their freezing and drought resistance and reduce pests and diseases.

Technical effect: Crop production can increase by 20 - 30%.

Technical points:

(1) Avoid applying immediately after leaving the pool. Biogas fertilizer is highly reducing. If applied immediately after leaving the pool, it will compete with crops for oxygen in the soil, affect seed germination and root development, and cause crop leaves to yellowing and wilting. Therefore, when the biogas manure is discharged from the pond, it is generally stored in the septic tank for 5 to 7 days before being applied; the biogas residue and phosphate fertilizer are mixed in a ratio of 10:1 and then applied for 5 to 7 days. The effect is better.

(2) Avoid applying directly without adding water. When biogas manure is applied directly to crops without water, especially when used to topple seedlings, it will cause burning of crops. When biogas manure is used as topdressing, water must be added first. Generally, the amount of water added is half of the amount of biogas slurry.

(3) Avoid spreading topsoil. Biogas fertilizer should be applied to dry land crops by hole application, ditch application, and then covered with soil. Applied to paddy fields should be evenly spread on the field surface before land preparation, and then turned into the bottom layer with a plow.

(4) Avoid excessive application. The amount of biogas fertilizer applied should not be too large, and is generally 1,500 - 2,500 kg per mu than applying ordinary pig manure fertilizer. Otherwise, crops will grow excessively and the rows will be shaded, resulting in reduced production.

(5) Avoid mixing it with alkaline fertilizers such as plant ash and lime. Plant ash, lime, etc. are highly alkaline, and mixing with biogas fertilizer will cause nitrogen loss, thus reducing fertilizer efficiency.