"Marsh manure is really good. Not only does it have sufficient nutrients, but it also gives me 500 yuan of fertilizer money." On March 8, Xu Qiang, a biogas supervisor, saw the biogas from his biogas digester pumped to a wheat field with a slag dredger. In the village, Zhang Linzong, a villager in Jindouyan Village, Tiefo Town, Tongjiang County, opened his arms. In order to help farmers cultivate in spring and realize pollution-free agricultural production, Tongjiang County has established more than 20 biogas slurry and biogas residue technology service teams, and in-depth farmers have vigorously promoted the comprehensive utilization of biogas, biogas slurry and biogas residue “Sanmeng†to increase farmland fertility. Farmers increase income. Biogas slurry and biogas residue are called biogas fertilizers. They are the products of biomass anaerobic fermentation through biogas digesters. The biogas slurry contains rich nitrogen, phosphorus, potassium and other nutrients, which are environmentally friendly, economical, time-saving, and labor-saving. Suitable for farmland use. Yan Shian, a professional fruit farmer of Zhouziping Village, Minsheng Town, told reporters that a biogas digester was built last year, using biogas fertilizers to fertilize the fruit trees, which increased the quality and output of the fruit and earned more than 30,000 yuan. At present, more than 20% of the farmland and fruit and vegetable bases in Tongjiang have adopted the “three-methane†“low-carbon fertilization†method. It is understood that Tongjiang's existing 48,000 biogas digesters can produce 210,000 tons of biogas fertilizer, all of which are used for spring fertilization, which can save farmers about 31.5 million yuan in fertilizer purchases.