Long-term Monitoring Study of Soil Chemical Contents and Quality in Paddy Fields
2010
Kim, M.S., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Kim, W.I., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Lee, J.S., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Lee, G.J., Highland Agriculture Research Center, National Institute of Crop Science, Pyongchang, Republic of Korea | Jo, G.L., Gyeonggido Agricultural Research and Extension Services, Hwasung, Republic of Korea | Ahn, M.S., Gangwondo Agricultural Research and Extension Services, Chuncheon, Republic of Korea | Choi, S.C., Gangwondo Agricultural Research and Extension Services, Chuncheon, Republic of Korea | Kim, H.J., Chungbuk Agricultural Research and Extension Services, Cheongwon, Republic of Korea | Kim, Y.S., Chungbuk Agricultural Research and Extension Services, Cheongwon, Republic of Korea | Choi, M.T., Chungnam Agricultural Research and Extension Services, Yesan, Republic of Korea | Moon, Y.H., Jeonbuk Agricultural Research and Extension Services, Iksan, Republic of Korea | Ahn, B.K., Jeonbuk Agricultural Research and Extension Services, Iksan, Republic of Korea | Kim, H.W., Jeonnam Agricultural Research and Extension Service, Naju, Republic of Korea | Seo, Y.J., Gyeongbuk Agricultural Research and Extension Service, Daegu, Republic of Korea | Lee, Y.H., Gyeongnam Agricultural Research and Extension Service, Jinju, Republic of Korea | Hwang, J.J., Jeju Agricultural Research and Extension Services, Jeju, Republic of Korea | Kim, Y.H., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea | Ha, S.K., National Academy of Agricultural Science, RDA, Suwon, Republic of Korea
There is very important to investigate long-term trend of soil chemical properties and quality index for sustainable agriculture and production of agricultural safety products. Monitoring on soil chemical properties in paddy soils was conducted as one cycle with 4 years from 1999 to 2007. Paddy soil samples were taken from 4,007, 1,970, 2,070 sites in 1999, 2003 and 2007, respectively. With these data, soil quality index (SQI) was evaluated by method that Yoon et al suggested in 2004. Chemical properties of paddy soils were 5.8 for pH, 24 g kg-¹ for organic matter, 132 mg kg-¹ for available phosphate, 0.29 cmol∧c kg-¹ for exchangeable potassium, 4.7 cmol∧c kg-¹ for exchangeable calcium, 1.3 cmol∧c kg-¹ for exchangeable magnesium and 126 mg kg-¹ for available silicate in 2007. Long-term change was shown that pH has increased gradually whereas exchangeable potassium has decreased. However, reasonably large changes were found. Exchangeable calcium and available silicate level in 1999 was 4.0 cmol∧c kg-¹, 86 mg kg-¹, but had risen to 4.7 cmol∧c kg-¹, 126 mg kg-¹ in 2007, respectively. The change of paddy soils quality index was increased gradually and increasement of silicate quality index was higher than other quality indicators.
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