Raw R-Data Three Way: Enhancing fertility of volcanic ash–affected soils

This dataset contains raw experimental data evaluating the potential of diazotrophic phosphate-solubilizing bacteria (DPSB), including Bacillus subtilis, Priestia megaterium, and their consortium, to improve soil fertility and maize growth in volcanic ash-affected Andisols under reduced fertilizer input. Primary Focus: Assessing soil biological, chemical, and physical properties under different soil amendment or management treatments. Experimental Design: Three-Way Factorial Design (evaluating three independent factors and their interaction effects). File Format: Microsoft Excel (.xlsx) containing raw numerical observations and structured data parameters. Target Application: Soil science research, agronomy, land rehabilitation, and agricultural management in volcanic regions.