ライシメータによる砂丘畑地の施肥窒素の溶脱と窒素収支

概要

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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 tabacco 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.
社団法人日本土壌肥料学会の論文
1995-08-05