BACKGROUNDS: The reclaimed lands for agricultural use managed by the nation consist of 17,025 hectares of lands under construction and 13,369 hectares of completed reclaimed lands in Korea. In order to utilize these reclaimed lands as a competitive agricultural complex, the government is planning to develop a comprehensive development plan for these reclaimed lands.
METHODS AND RESULTS: We selected 85 representative sampling sites from these reclaimed lands and analyzed soil chemical properties from 2013 to 2016 to provide ground data for rational land-use planning and soil management. Soil analysis results shows that annual mean value of soil EC displayed range of 5.1 to 8.3 dS m-1 and have continued to decrease over the years(estimation equation y = 0.0736x2 - 1.4985x + 9.8305, R = 0.9753). The pH level represents a range of 7.3 to 7.6, indicating a higher level than the appropriate range (5.5~7.0). Soil organic matter (OM) ranged from 8 to 11 g kg-1, indicating a lower level than the optimum range (20~30 kg-1). The available silicic acid (Av.SiO2) ranged from 169 to 229 mg kg-1, close to the appropriate range (≥157 mg kg-1) of paddy field. The available phosphoric acid (Av.P2O5) content represents a value of between 24~39 mg kg-1, indicating a lower level than the appropriate range of Av.P2O5 (80~120 mg kg-1) for paddy field.
CONCLUSIONS: For efficient agricultural use of reclaimed lands managed by nation it was found that the supply of organic matter and insufficient nutrients (Av.P2O5, Ca, etc.) was needed with continuous desalinization.