Korean Journal of Soil Science and FertilizerISSN:0367-6315(Print) 2288-2162(Online)한국토양비료학회

The chemical properties of orchard soils in Gangwon state have been monitored every 4 years from 2002 to 2022 in order to provide basic information for orchard soil fertility management. In 2022, the soil chemical properties of orchard were 6.3 of pH, 0.82 dS m^-1 of EC, 38 g kg^-1 of organic matter (OM) and 803 mg kg^-1 of available phosphate (Avail. P₂O₅). Exchangeable (Exch.) potassium (K), calcium (Ca) and magnesium (Mg) were 1.2, 7.2 and 2.0 cmol_c kg^-1, respectively. The distribution percentages within optimal range of pH were 43% in 2002, 30% in 2006, 45% in 2010, 41% in 2014, 39% in 2018, and 34% in 2022. The percentages for OM were 38% in 2002, 34% in 2006, 31% in 2010, 25% in 2014, 26% in 2018, and 29% in 2022. The excessive percentages for Avail. P₂O₅, Exch. Ca and Mg increased from 52% in 2002 to 71% in 2022, from 25% in 2002 to 55% in 2022, and from 19% in 2002 to 40% in 2022, respectively. In terms of heavy metals, mean contents of Cd and Hg were less than 5% of soil pollution standards (4 mg kg^-1). Cu, Ni, Pb, and As were distributed to less than 20% of soil pollution standards. Therefore, it is necessary to fertilize based on soil test in order to maintain the soil chemical properties of the orchard soil within in an appropriate range.

Excess, deficient, and optimal proportion of chemical properties of orchard soils in Gangwon state (n = 80).