The degrees of seven soil factors affecting the KH_2PO_4-extracted Se: CaCO_3>silt > organic matter > clay > pH > free iron > CEC.

• 7种土壤因子对KH_2PO_4浸提态硒影响的程度依次为:CaCO_3>粉粒>有机质>粘粒>pH>有效性铁>代换量。