Saturday, 15 July 2006
143-4

The Study on the Changes of Physico-Chemical Properties in Salty Paddy Field in Korea.

Chul-Hyun Yoo1, Byeong-Su Kim1, Chang-Hyu Yang2, Ji-Ho Jeong3, Jae-Duk Kim1, and kwang-Yong Jung2. (1) Honam Agricultural Research Institute NICS, RDA, 381 Songhakdong, Iksan, 570-080, South Korea, (2) Honam Agricultural Reasearch Institute NICS, RDA, 381 Songhakdong, Iksan, 570-080, South Korea, (3) Honam Agricultural Rearch Institute NICS, RDA, 381 Songhakdong, Iksan, 570-080, South Korea

The physico-chemical properties of ten reclaimed saline soils in five soil series of west-south Korea were analyzed according to the years past after reclamation to establish soil and fertilizer management. The soil samples were collected at the same places two times in 2000 and 2004. The phyco-chemical properties in 2000 had been changed in 2004 as follows. Bulk density of subsoil increased in Poseung, Podu(fine textured soil) but decreased in Gwanghwal, Yeompo, and Munpo(coarse textured soil). Porosity decreased in Poseung and Podu but increased in Gwanghwal, Yeompo and Munpo. Soil hardness increased in Poseung and Podu, Gwanghwal, Yeompo and Munpo but decreased in Munpo. Solid phase increased in Poseung and Podu but decreased in Gwanghwal, Yeompo and Munpo. Liquid phase increased in Poseung, Gwanghwal, Yeompo and Munpo but decreased in Podu. Gaseous phase decreased in Poseung, Yeompo and Podu but increased in Gwanghwal and Munpo. Salinity in Poseung, Podu, Gwanghwal, Yeompo and Munpo decreased 1.8dS m-1, 1.0dS m-1, 1.8dS m-1, 2.0dS m-1, respectively. Soil pH were decreased 0.7 in Poseung, 0.4 in Gwanghwal and 0.1 in Podu, Yeompo and Munpo during the four years. The content of organic matter decreased 2.7g kg-1 in Podu, 2.4g kg-1 in Munpo, 1.6g kg-1 in Poseung, 0.7g kg-1 in Gwanghwal and 0.3g kg-1 in Yeompo. The content of available phosphate decreased 16mg kg-1 in Poseung, 12mg kg-1 in Podu, 4 mg kg-1 in Yeompo and 2mg kg-1 in Gwanghwal and Munpo. The content of available silicate as well decreased 157mg kg-1 in Poseung, 144mg kg-1 in Gwanghwal, 102mg kg-1 in Podu, 68mg kg-1 in Yeompo and 17mg kg-1 in Munpo. The content of exchangeable potassium decreased 0.96cmolc kg-1 in Gwanghwal, 0.73cmolc kg-1 in Podu, 0.55cmolc kg-1 in Poseung, 0.17cmolc kg-1 in Munpo and increased 0.22cmolc kg-1 in Yeompo. The content of exchangeable calcium decreased 1.6cmolc kg-1 in Yeompo and 1.5cmolc kg-1 in Podu, while it increased 1.7cmolc kg-1 in Poseung, 0.4cmolc kg-1 in Gwanghwal and 0.8cmolc kg-1 in Munpo. The content of exchangeable magnesium increased 2.1cmolc kg-1 in Yeompo, 1.0cmolc kg-1 in Podu and Munpo and 0.6cmolc kg-1 in Poseung, while it decreased 0.1cmolc kg-1 in Gwanghwal. The content of exchangeable sodium decreased 2.1cmolc kg-1 in Gwanghwal, 1.6cmolc kg-1 in Podu, 1.0cmolc kg-1 in Yeompo and 0.1cmolc kg-1 in Poseung while it increased 0.7cmolckg-1 in Munpo.

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