Core Viewpoint - The article discusses the challenges and potential solutions related to the treatment and application of biogas slurry produced from anaerobic fermentation of livestock manure, emphasizing the need for responsible management and innovative application methods [1] Group 1: Current Challenges - Biogas slurry contains nutrients like nitrogen, phosphorus, and potassium, which can be used as liquid fertilizer, but faces issues such as public perception, strong odor, and inadequate irrigation systems [1] - The treatment of biogas slurry has two main pathways: either to be discharged after meeting standards under the supervision of environmental management departments or to be used as liquid fertilizer with guidance from agricultural departments [1] Group 2: Application Techniques - The nutrient content of biogas slurry is relatively low, making it suitable for "water-fertilizer integration" application, which can be done even during fallow periods to maintain soil fertility [1] - During the rainy spring season, application should be timed to avoid rain, and optimized plans are necessary to prevent surface water pollution from liquid fertilizer [1] Group 3: Innovative Solutions - The emerging drone spraying technology offers high efficiency and uniform application, overcoming payload limitations and presenting significant potential for widespread adoption [1] - Drones can be used not only in farmland but also in forests and grasslands, suggesting a broader application scope for biogas slurry [1] - Relevant departments are encouraged to explore new issues and leverage advanced technologies to maximize the resource value of biogas slurry [1]

Core Viewpoint - The article highlights the innovative approach taken by a company in Xinyu, Jiangxi, to utilize excess straw after harvest, transforming it into clean energy and organic fertilizer, thereby benefiting local farmers and promoting environmental sustainability [1] Group 1: Straw Utilization - The company in Xinyu collects straw from fields after harvest, which was previously left to decompose or burned, causing pollution [1] - The collected straw is processed with livestock manure in anaerobic fermentation tanks, producing biogas for electricity generation and residential gas supply [1][1] - The fermentation process yields 20 million kWh of electricity annually and meets the gas needs of 5,000 households [1][1] Group 2: Organic Fertilizer Production - The company produces 30,000 tons of organic fertilizer and 380,000 tons of liquid fertilizer each year from the fermentation byproducts, which are then returned to the fields [1][1] - This process not only provides organic fertilizer but also supports local agricultural production [1] Group 3: Diversified Utilization Methods - Xinyu has developed multiple pathways for straw utilization, including edible mushroom substrates, beef cattle feed, and fiber processing, creating a comprehensive recycling model [1] - The city recycles 450,000 tons of straw annually, achieving a recycling rate of 95.53% [1]