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鄭英祥,梁在義,韓連奎,崔文憲 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-
Feasibility of simple rapid methods to determine nitrate concentration in soil and plant sap in siltu was assessed using Merckoquant strip method and Cardy NO_(3)- sensor. The saturated extract of a soil was sampled readily in field by a simple apparatus which consists of a syringe, a vial and a hand vacuum pump with a vacuum valve. The simple measurement methods for saturated extract were tested for soil samples obtained from the thirty three farm vinyl houses around Chuncheon, Kang-weon-Do and Kuri, Kyeonggi-Do. The methods were tested for soil and plant sap samples grown under different fertilization in a vinyl house at Kangweon National University. The main treatments were with or without organic fertilizer, and subtreatments were four nitrogen levels ; 0, 100, 200 and 400kg/ha for lettuce and 0, 150, 300 and 500k9/ha for cucumber. The Cardy sensor method showed a high confidence for soil and plant sap nitrate measurement. The Merckoquant strip method was also reliable, but checking electrical conductivity was recommended for better reliability. The soil nitrate concentration above 10mmo1/L was not desirable for lettuce yield, and 15mmo1/L for cucumber. The respective electrical conductivities of saturated extracts were 3 to 4ds/m at these concentrations. The soil nitrate concentration could be monitored by Amberlite IRN-150 Resin-bag. A good correlation was obtained between the soil nitrate concentration and the nitrate absorbed by the resin bag. Therefore, use of the resin bag could be recommended to monitor nitrate in soil, minimizing soil destruction.