An, Z., Gross, C.D., Chen, X. et al. Manure and its biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More affect activities and stoichiometry of soil extracellular enzymes in croplands. J Soils Sediments (2024). https://doi.org/10.1007/s11368-024-03887-7

This study explores how manure compost and its biochar derivative influence soil extracellular enzyme activities (EEAs), their stoichiometry (EES), and nutrient availability in central Alberta, Canada, two years after application. These factors are essential for understanding resource limitations for soil microbes, which in turn affect soil fertility and ecosystem health.

The study measured various soil enzymes such as β-glucosidase (BG), cellobiohydrolase (CBH), Leucine aminopeptidase (LAP), β-1,4-N-acetylglucosaminidase (NAG), and acid phosphatase (AP). Results showed that while manure and biochar applications did not significantly affect soil carbon (C), phosphorus (P), or nitrogen (N) availability, they did impact specific enzyme activities related to nutrient cycling.

Manure application increased NAG activity by 13.9% compared to the control, indicating enhanced microbial activity in response to carbon limitations. Biochar, on the other hand, increased LAP activity by 22.1% compared to manure, suggesting that biochar induced nitrogen limitations for soil microbes.

Despite these changes in enzyme activities, the overall stoichiometry of C, N, and P cycling enzymes remained largely unaffected by either amendment. The study concludes that while manure and biochar can influence certain soil enzyme activities and nutrient cycling dynamics, their long-term effects on microbial resource limitations are complex and vary depending on the amendment type.