Leaching of nitrate causes several serious environment problems. It is better to understand the nitrification process in different soil types, so that it could be managed, especially in proper fertilization way to reduce nitrate leaching. Nitrification research has not been paid more attention to this area. Purpose of this paper is to study nitrification in three types of managed soils from three ecological regions of Shaanxi Province, China. They were Loess soils from north, Cumulic cinnamon soils from mid...