ABSTRACT Cunanan, Carlo G. June 2023." INFLUENCE OF OSMOPRIMING AND PLANT SPACING IN BABY CORN PRODUCTION" Master of Science in Agriculture, major in Horticulture. Pampanga State Agricultural University, PAC, Magalang. Pampanga. Adviser: CARREN C. JUICO, PhD The study, Influence of Osmopriming and plant spacing in baby corn production was conducted at Crop Science Field Laboratory, Pampanga State Agricultural University - PAC Magalang, Pampanga, from March 2023 to May 2023. Osmopriming using Calcium nitrate and planting Baby corn at different planting spaces was employed in the study. The experimental design used was two factors factorial in Randomized Completely Randomized Design (RCRD) with three replications. The treatments utilized in this study were the concentrations of calcium nitrate as follows: 5,000 ppm (26.329L), 10000ppm (52.63g/L), and 15000ppm (78.95g/L) with interactions in planting space of 60 cm x 20 cm and 60 cm x 15 cm. The results were subjected to Analysis of Variance (ANOVA), and either difference for significant findings was compared using either Least Significant Diferences (LSD) test for significant findings. Results of the study revealed a significant difference among other parameters of concentrations of calcium nitrate as seed priming and plant spacing. In terms of concentrations of calcium nitrate as seed priming, plants primed with 15,000 ppm concentration produced early emergence, the higher percentage of germination; Vigor plants in terms of plant height at 25 DAS; while in sweetness of com ears, both C4-15000 ppm and C3- 10,000 ppm produced comparable significant results. Interactions between Osmopriming and plant spacing were not evident in the results of this study. However, narrow plant spacing of 60 cm x 15 cm numerically improved the yield of baby com production and obtained an ROI of I 15.74%.