Standardization of magneto-priming technique treatments on seed and seedling vigor traits of onion cultivar Giza Red, under growth chamber and nursery conditions during 2018/2019 and 2019/2020 seasons. Therefore, a laboratory and nursery experiments were conducted in a Completely Randomized Design and Split-Split Plot Design with three replicates, respectively, consisted of; seed priming techniques vis., ordinary-priming and magneto-priming, chemical solutions vis., zinc sulfate (ZnSo_4, 500 mgL^-1), ascorbic acid (ASA, 50 mgL^-1­) and distilled water (control treatment), along with durations time of seed priming vis., 12, 18 and 24 hours. It be concluded that, magneto-priming, ASA and ZnSo₄ solutions and 24 hours of seed priming treatments presented the highest significance increases compared to the other treatments in both of the two experiments. Furthermore, the combination between magneto-priming and ASA reveled the highest rated upon the control treatment, which were 50.4% for coefficient of velocity of germination, 36.7% for seedling length, 27.7% for seedling dry weight, 58.2% and 48.7% for seedling vigor index (I & II) and minimized mean germination time by 19.3%. Likewise, concerning the nursery experiment, the combination between magneto-priming and ZnSo₄ presented the highest increases over control by 24.7% for speedof emergencein the firstseason and 28.3% & 18.2% for seedling length in bothseasons. While, the combination between magneto-priming and ASA detected the highest increases by 16% & 14% for field emergence, 34.4% & 38.5% for seedling dry weight, 56% & 58% for seedling vigor index and 36% & 37.5% for total amino acids in bothseasons.