Nitrate leaching and nitrogen balance in sand dune upland soil by lysimeter
1995
Nonaka, M. (Niigata Univ. (Japan). Faculty of Agriculture) | Kamura, T.
The influence of nitrogen fertilizer and nitrate leaching in a sandy soil was studied in a lysimeter experiment. Nitrogen balance was also measured in this experiment. The results are summarized as follows: 1) during the one year experiment, the application of 430 kg ha(-1) of nitrogen fertilizer resulted in 180 kg ha(-1) nitrogen leached and 140 kg ha(-1) crop nitrogen uptake. 2) In autumn radish cropping, the amount of nitrogen leached from inorganic nitrogen fertilizer application was increased by enough irrigation water and rainfall (10 mm d(-1)). After harvesting, however, part of the nitrate accumulated in the subsoil probably as a result of the short cultivation periods (56 d). 3) In summer tobacco cropping, the amount of nitrogen leached from organic nitrogen fertilizer application was strongly increased by rainfall after finished four weeks mulch. The total amount of organic nitrogen fertilizer was mineralized in topsoil during the long cultivation periods (116 d). Nitrate from their fertilizer was mostly leached in this period
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