![]() Understanding the characteristics of soil solute transport is fundamental to the design and management of furrow irrigation systems. ![]() The horizontal distribution range of NO 3 −-N and K + increased with the increase of h 0, but it had no obvious influence on the vertical range. The distribution range of NO 3 −-N increased with the increases of θ 0 and the KNO 3 concentration, which had barely any effect on the range of K + distribution. ![]() The soil saturated water content, saturated hydraulic conductivity, and empirical parameter n in the van Genuchten–Mualem model increase with the increase of KNO 3 concentrations, whereas the empirical parameter a shows a decreasing tendency. The results indicated that the soil hydraulic and solute transport parameters determined from the inversion solution with HYDRUS-2D were reliable. Then, the initial soil water content ( θ 0), KNO 3 concentration, and water depth ( h 0) affecting the transport characteristics of nitrate nitrogen (NO 3 −-N) and potassium (K +) were analyzed. The experimental data were obtained from the infiltration of clay loam and sandy loam of different potassium nitrate (KNO 3) concentrations under furrow irrigation. This study determined the soil hydraulic and solute transport parameters by inverse solution with HYDRUS-2D and then verified them.
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