農業生産環境調査にみる我が国の窒素施用実態の解析

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Statistical data on fertilizer application in Japanese arable farming, which were collected from 16,158 farms by the Statistics and Information Department, Ministry of Agriculture, Forestry and Fisheries in 1998,were analyzed by estimating the following parameters on each kind of crop ; 1) The amounts of total mineral N supplied to plants during the growing period as chemical fertilizer N and mineralized N from organic fertilizer and compact ; 2) The amounts of N absorbed in the above ground part of the plants ; 3) The amounts of N not absorbed by the plants by subtracting 2 from 1) (nonabsorbed N) and 4) The efficiency of applied N by the plants (the ratio of 2 to 1). The following results were obtained. 1) The mean amount of the nonabsorbed N was very high in outdoor celery (732), outdoor eggplant (483), outdoor cucumber (482), greenhouse celery, tea plant (350), Japanese pear (317), greenhouse eggplant and greenhouse cucumber (311 kg N ha^<-1>). 2) When compared among the outdoor and greenhouse vegetable, outdoor vegetables were applied with the higher amounts of N and gave the lower yields, thus resulting in a higher amount of the nonabsorbed N with lesser utilization efficiency of applied N. 3) The mean yields of conventionally grown outdoor vegetables and tea plants in each prefecture were plotted against the total amounts of mineral N supplied. Although the yields of most plants declined by the heavy N application, the yields of outdoor eggplant and tea leaves were not declined, even by the 1,100 kg N ha^<-1>. The utilization efficiency of N for most outdoor vegetables significantly declined with the increase of the amounts of N application. Especially, the utilization efficiencies of N of outdoor eggplant and cucumber were lower than 20% in most of the prefectures.
社団法人日本土壌肥料学会の論文
2001-08-05

農業生産環境調査にみる我が国の窒素施用実態の解析

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