BACKGROUND: Monitoring of the dynamic changes of chemical properties in agricultural land is very important for agricultural sustainability. Soil chemical properties of agricultural soils in Korea were investigated at four-years interval in order of paddy, plastic film house, upland, and orchard soils since 1999.
METHODS AND RESULTS: Total 8,160 topsoil samples were taken from the upland in 2001, 2005, 2009, 2013 and 2017, respectively. Soil chemical properties such as pH, electrical conductivity (EC), organic matter (OM), available phosphate (Avail. P2O5), exchangeable (Exch.) cations (K, Ca, and Mg) contents were analyzed. Soil pH and Exch. Ca contents have been increased since 2001. Average concentration of Avail P2O5 increased from 547 mg kg-1 in 2001 to 657 mg kg-1 in 2017. Average concentration of Exch. Ca in 2017 was higher than the upper limit of its optimal range for upland cultivation. Excess and deficient of chemical properties of upland soils comply with soil analysis and fertilizer prescription.
CONCLUSION: we concluded that Excess nutrient upland need to be properly fertilized.