ABSTRACT
Biogas slurry can increase soil nutrient content and enhance soil microbial activity, but there is a certain threshold for the application of biogas slurry. In order to discuss the appropriate frequency and amount of biogas slurry application, and to provide a theoretical reference for further determining the application amount and fertilization method of biogas slurry in the field, a soil column leaching experiment was adopted with 6 different biogas slurry application rates in this paper, and the single treatment was leached 5 times, and the nutrient content in the infiltrating water was measured after the leaching was completed. This leaching test showed that the content of total phosphorus, total nitrogen, ammonia nitrogen, and nitrate nitrogen in the submerged leachate of the soil increased after multiple successive use of biogas slurry and an increase in the application rate of single biogas slurry, and the greater the application amount of biogas slurry, the nutrient content increases more obviously. Considering the impact of biogas slurry application frequency and application rate on infiltration liquid, in order to avoid the infiltration and pollution of the surrounding water environment, the single application rate should be controlled within 120% of the standard nitrogen demand for plant growth.
