N mineralization and nitrification potential of soil samples
under lab conditions
Soil microcosms were established in the lab to determine N
mineralization and nitrification potentials using soil subsamples
collected in 2021. Soil subsamples (12.5 g dry soil equivalent) were
placed into 120-ml amber jars capped with loose-fitting lids to ensure
aerobic condition, and incubated at 25°C for 28 days. The soil moisture
was maintained at 60% WHC (water holding capacity) by weighing twice
per week and adding water as needed. At the end of the 28-d incubation,
soil NH4+-N, and
NO3−-N concentrations were determined
(Neill et al. 1997).