Affiliations: Department of Plant Nutrition, China Agricultural
University,Beijing 100094,China.E-mail:[email protected]
Note:  Present address: Agrometeorology Institute of Chinese Academy of
Abstract: A thirteen years long-term field fertilizer experiment was conducted
to monitor the effect of different fertilization on soil nitrate distribution.
The results showed: (1) Applying relative excessive N fertilizer could result
large quantities of NO_3^- residue and NO_3^- movement downward in soil
profiles; amending phosphate fertilizer or organic manure with nitrogen
fertilizer together could significantly improve the status of NO_3^- leaching
downward due to the balanced uptake of nutrients by crops. (2) Appropriate
amounts of nitrogen fertilizer which was equal or smaller than the optimal
fertilization rate could not result in more NO_3^- leaching in Northern China.
(3) Precipitation influenced the amounts and depth of soil NO_3^- leaching:
NO_3^- could move to 80 cm depth or below at autumn or at the next spring when
rainfall was higher during the rainy season through July to September in North