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GRABE, D.F. (ed.) 1970. Tetrazolium Testing Handbook for Agricultural Seeds. Contribution No. 29
       to the Handbook on Seed Testing,  AOSA.   Plate V Soybeans.

Photos:  R. P. Moore

Left:                                                                    
First seed: Germinable.  Completely stained.           
Second seed:  Germinable. Completely stained.       
Third seed: Germinable.  Slight deterioration.           

Right:
First seed: Non-germinable.  Large central area of cotyledon unstained.
Second seed:  Germinable.  The unstained portion of the cotyledon is a non-critical area for germination.
Third seed:  Non-germinable.  Radicle unstained.