Fig. 4
Correlation heatmap between alfalfa seed germination, seedling growth, and physiological indicators under calcium stress. GR, germination rate; GP, germination potential; GI, germination index; VI, vigor index; RL, root length; BL, bud length; DW, dry weight; RWC, relative water content; MDA, malondialdehyde; POD, peroxidase; CAT, catalase; SOD, superoxide dismutase; Pro, proline; SS, soluble sugar. *P < 0.05; **P < 0.01