Long-term Assessment of Chemical Properties from Paddy Soils in Gyeongnam Province

초록

Field monitoring was performed to evaluate the chemical properties of 260 paddy soils every 4 years from 1999 to 2015 in Gyeongnam province. Soil chemical properties, including soil pH, electrical conductivity, amount of organic matter (OM), available phosphate (P2O5), exchangeable potassium (K), calcium (Ca), magnesium (Mg) and sodium (Na), and available silicate (SiO2) were analyzed. In 2015, the average values of pH, OM, available P2O5, exchangeable K, Ca, and Mg, and available SiO2 was 5.8, 30 g kg-1, 222 mg kg-1, 0.37 cmolc kg-1, 6.5 cmolc kg-1, and 1.4 cmolc kg-1, 252 mg kg-1, respectively. The frequency distribution within optimum range of paddy soils was 49.2%, 20.8%, 18.5%, and 5.8% for soil pH, OM, available P2O5, and available SiO2, respectively. The available P2O5 concentrations in 2015 was excess level with portion of 58% and did not alter significantly during the experimental period. Although the average of available SiO2 concentration has tended to increase with every year, the insufficient proportion of available SiO2 concentration in 2015 was 48%. These results indicated that a balanced management of soil chemical properties can properly control the amount of fertilizer applied for sustainable agriculture in paddy field.

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