Chemical characteristics of agricultural groundwater with different land use type, and season in Gyeong-buk Province from 2021 to 2024

다국어 초록 (Multilingual Abstract)

To determine the suitability of groundwater quality for agricultural use in the Gyeong-buk Province, the chemical properties of groundwater were analyzed from 2021 to 2024. pH, electric conductivity (EC), total nitrogen (T-N), total phosphorus (T-P), nitrate nitrogen (NO3-N), chloride ion (Cl-), sodium (N), magnesium (Mg), potassium (K), and calcium (Ca) were measured in April and July every year and analyzed by land use type. Ca and T-P showed little differences regardless of the type of land use. The T-N in upland fields was lower compared to other land use types, but the pH was higher. The concentrations of Cl-, Na, Mg, K, and Ca in groundwater were highest in the greenhouse fields, but there was no clear differences between year-to-year or April and July. NO3-N and Cl- concentrations maintained good water quality that did not exceed the agricultural groundwater standard for four years. The pH also met agricultural standards during the survey period, as it recorded pH 5.8, below the standard, at just one point of the water sample taken from green house in April 2023. The results obtained in the study implying that agricultural groundwater in Gyeong-buk Province was generally suitable for agricultural purpose.