Method for evaluating salt tolerance of plants

The invention relates to the field of plant cultivation, in particular to a method for evaluating salt tolerance of plants. The method comprises the following steps: (1) measuring biomass percentages corresponding to a plurality of plants under different salt concentrations; (2) taking the salt concentration as an abscissa and the biomass percentage as an ordinate, respectively drawing curve charts of the plants according to the data in the step (1), and respectively measuring and calculating the area of a region enclosed by the curve charts of the plants, the x axis and the y axis, namely the biomass area Si of the plants; (3) determining a reference plant Xb, and recording other plants as Xi; a corresponding salt concentration point when the biomass percentage of the reference plant Xb on the abscissa is 0%, a point with the biomass percentage being 100% and an original point serve as three end points of a rectangle, a reference rectangle is drawn, and the area of the reference rectangle is S; and (4) calcu