manuscript.xlsx

This dataset contains the complete experimental data from a study investigating the effects of inoculation with the plant growth-promoting bacterium Bacillus megaterium and the application of mineral NPK fertilizer on the growth, chlorophyll content, flower and bulb productivity of Narcissus tazetta L. The study was conducted as part of a Master’s thesis at the Faculty of Agricultural Engineering, Damascus University, Syria.The dataset includes raw measurements of plant growth parameters (leaf length, leaf number, Bulb germination), physiological traits (chlorophyll content), and yield components (number of flowers, bulb number). Treatments included a control, mineral fertilizer alone, Bacillus megaterium alone, and combined treatments. Data were collected under controlled field conditions following a randomized complete block design.These data support the findings presented in the manuscript submitted to PLOS ONE, providing a detailed basis for statistical analysis and enabling replication or meta-analysis.