Three field studies were conducted to determine the effects of compost, plant growth promoting rhizobacteria (PGPR) and NPK on growth and yield of three vegetables. Two PGPR strains (Nitrogen-fixing Bradyrhizobium japonicum and Phosphate-solubilizing Bacillus subtilis) supplemented into compost and bacterial liquid were added into compost during vegetable cultivation, chemical fertilizer (100 N – 80 P₂O₅ – 40 K₂O) and control (non inoculation). The study revealed that compost inoculated with PGPRs can replace 50% chemical fertilizer in three vegetables cultivation, farmers but also saved 50 N – 40 P₂O₅ – 20 K₂O not only minimized environmental pollution.