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This study was conducted to investigate the effect of nitrogen fertilizer on nitrate concentration in soil solution and to determine the relationship between yield and nitrate concentration in soil solution for cucumber cultivation under plastic film house. Nitrogen as urea was applied at rates of 0, 120, 240, 360, and 480 kg N ha -1 as an additional fertilizer by trickle irrigation during cucumber cultivation. Monitoring of nitrate concentration in soil solution was investigated using porous cups at 25 cm depth under soil surface. Nitrate concentration in soil solution increased with increasing the rate of additional nitrogen. Correlation coefficient between EC value and nitrate concentration was positive in soil and soil solution (p -1 was shown the highest yield of cucumber, and improved yield by 5% compared to N recommendation of 240 kg N ha -1 . The highest yield was determined at nitrate concentration of 82 mg L -1 in soil solution by regression equation (Y=74.2+0.73X+ 0.000504X 2 , R 2 =0.629*). These results indicate that nitrate concentration in soil solution would be useful method to rapid determination for additional nitrogen during cucumber cultivation under plastic film house.

Effect of Nitrogen Application Levels on Nitrate Concentration in Soil Solution under Plastic Film House