Used for the quantitative detection of nitrate reductase (NR) activity in soil samples, this ELISA kit enables researchers to assess microbial nitrogen cycling activity in environmental studies. It is widely applied in agriculture and ecology to monitor soil health and fertility by measuring the functional capacity of microorganisms to reduce nitrate, a key step in the nitrogen cycle. The kit supports research on the impact of fertilizers, land use changes, and pollution on soil microbial activity. Its high sensitivity allows for early detection of changes in nitrogen transformation processes, making it valuable for sustainable farming practices and environmental monitoring.