The Soil Glutamine Amidase (S-GLS) Activity Assay Kit is primarily used to measure the activity of glutamine amidase in soil samples. This enzyme plays a crucial role in the nitrogen cycle by catalyzing the hydrolysis of glutamine to glutamate and ammonia. Monitoring S-GLS activity helps assess soil health and fertility, as it provides insights into nitrogen availability and microbial activity in the soil. This is particularly useful in agricultural research to optimize fertilizer application, improve crop yield, and maintain sustainable soil management practices. Additionally, environmental scientists use this kit to study the impact of land use changes, pollution, and climate variability on soil enzyme activities and ecosystem functioning.