砂丘畑地土壌における施肥窒素成分の下層への移動と地下水の硝酸態窒素濃度の変化

概要

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The study on relationship between nitrogen fertilizer and accumulated water (precipitation and irrigation) and nitrate movement through soil profile on groundwater pollution was carried out on the experimental field in sandy soil for 1 year. The nitrogen fertilizers were applied to 268 N kg ha^<-1> as chemical fertilizers in autumn radish cropping and 171 N kg ha^<-1> as organic matters in summer tobacco cropping. The results were summarized as follows : 1) The chemical form of leached nitrogen was mostly as nitrate. The nitrate concentration in groundwater was increased by more than 100 mm accumulated water per month, but was decreased by below 100 mm accumulated water per month. 2) In the case of more than 100 mm accumlated water per month, the maximum peak of nitrate leaching appeared at 3 weeks after basal application during autumn radish cropping. But, in the drought summer season of 1994, the nitrate leaching was depressed during summer tabacco cropping.
社団法人日本土壌肥料学会の論文
1996-12-05