畑地からの窒素溶脱量モニタリングのためのテンションキャピラリーライシメーターの試作

概要

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As nitrate-nitrogen is included in the environmental quality standards for protecting human health, it is necessary to develop an easy and accurate method to monitor nitrogen leaching in upland fields. In this study, we developed tension capillary lysimeters (TCL) that can control suction pressures arbitrarily, and investigated nitrogen leaching in upland fields for two years and six months. The following results were obtained: 1) We developed two types of TCLs to monitor nitrogen leaching in upland fields. One is an equilibrium tension capillary lysimeter (TCLR) that is designed to maintain equilibrium between lysimeter suction and soil matric potential. The other is a constant suction pressure type, which collects percolating water continuously at constant suction pressures (3.9, 6.2 and 9.8 kPa). 2) Percolating water collection quantity 384 L m^<-2> of TCLR agreed with the experimental results of 404 L m^<-2> by Hasegawa and Eguchi (Soil Sci. Plant Nutr., 46, 227-236, 2002), and it was proven that TCLR could efficiently collect percolating water. 3) Percolating water collection quantity of TCLCs that had the suction pressures of 3.9, 6.2 and 9.8 kPa were 102, 254 and 431 L m^<-2>, respectively. 4) Total nitrogen concentration in percolating water was significantly reduced when Italian ryegrass was grown without fertilizer application.
社団法人日本土壌肥料学会の論文
2003-12-05