Chemical extraction of Cd from air-dried soil samples is a commonly applied method used to analyze available Cd in paddy soils. Although during the air-drying process, a range of different physical and chemical properties will contribute to altering the fractions of different Cd species in fresh soils, the characteristics and mechanisms underlying changes in the Cd fractions of paddy soils subjected to different fertilization treatments are still incompletely understood. In this study, using natural air-drying and freeze-drying methods, we inve...
