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干拓地 除鹽排水에 관한 硏究 : Mimyun, Ock-ku, Chulla-Buk-Do
李熙德 건국대학교 1978 論文集 Vol.8 No.1
For developing a reclaimed land of Mimyun region, the desalination by drainage was investigated synthetically. The results obtained were as follows. (1) An unit underdrainage level was 4 mm per day, and its level was appropriate for desalting of the reclaimed land as a standard value. (2) The ratio of drainage to irrigation level was 45 to 55 percentage, it was desirable that the basis of irrigation efficiency of the reclaimed land should be set up 0.5 to 0.6. (3) The desalination level per unit area was proportion to the interval of underdrain, namely 7.5 meter plot 5.2 kg/m2, 15 meter plot 3.9 kg/m2, and 30 meter plot was 1.2 kg/m2 respectively. (4) The saline level of surface soil (0∼20cm depth) was proportion to the interval of underdrain, namely 7.5 meter plot 5.6 mm hos/cm, 15 meter plot 11.1 mm hos/cm, 30 meter plot 14.4 mm hos/cm, and submerged desalination plot was 30 mm hos/cm respectively. (5) The growth of paddy rice on underdrain plot was better than non-underdrain plot. (6) In view of the yields of paddy rice, desalination level per unit and desalination rate, the inter of underdrainage was assumed to be 10 meters.