Effect of Compost, NPK and Plant Promoting Rhizobacteria (PGPR) on Growth and Yield of Three Vegetables cultivated on Arenosols

Abstract

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.