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Germination capacity of alfalfa seeds under low energy N+ implantation manifests oscillations goingdown with dose strength. From analyzing alfalfa genome DNA under low energy N+ implantation by RAPD (RandomAmplified Polymorphous DNA), it is recommended that 30 polymorphic DNA fragments be amplified with 8 primersin total 100 primers, and fluorescence intensity of the identical DNA fragments amplified by RAPD is different be-tween CK and treatments. Number of different polymorphic DNA fragments between treatment and CK via N+ im-plantation manifests going up with dose strength.