What type of study is this?

This is a Quantitative Study study.

Continuous Four‐Year Biogas Slurry Application Regulates the Soil Fertility, Microbial Communities, and Nitrogen Cycling Functions in a Farmland Ecosystem

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Continuous application of biogas slurry regulates soil fertility and microbial communities, suggesting important implications for nitrogen cycling.

Continuous application of biogas slurry significantly improves soil nitrogen content and nutrient levels, enhancing crop growth.
Soil enzyme activity, particularly urease and nitrate reductase, increased with prolonged biogas slurry application, indicating enhanced nutrient cycling.
The microbial community structure shifted, with a rise in Proteobacteria and decreases in other bacteria, affecting nitrogen cycling genes.
Long-term biogas slurry application presents both fertility benefits and ecological trade-offs, highlighting the need for optimized management.

Yu et al. (2025) studied this question.

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Continuous application of biogas slurry regulates soil fertility and microbial communities, suggesting important implications for nitrogen cycling.