The characterization of soil profile distribution for nitrate leached in the paddy soil

摘要

Experiment was conducted for five successive years under large undisturbed monolith lysimeters (2m × 2m in square, 1 m in depth). The soil was silty clay loam texture and had a content of total N 1.55 g/kg. The soil was flooded with penetration rate controlled at approximate 3 mm per day in duration of double-rice season and laid fallow and natural in winter and