Seed germination depends on internal and external factors relating to the seed but the whole process will normally occur if there are no restrictions during the stages of germination. So, the aim of the present study was to evaluate the viability and the vigor of pitaya seed under different pH levels. A completely randomized design was employed under a 3 × 13 factorial design [pitaya genotypes: Hylocereus undatus (white pitaya); H. undatus x H. costaricensis (pitaya hybrid I), and H. costaricensis x H. undatus (pitaya hybrid II), and pH levels: 3
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