The Effect of Concentration and Application Interval of Plant Growth-Promoting Rhizobacteria (PGPR) from Thorny Bamboo Roots (Bambusa Blumeana) on the Growth and Yield of Chili Pepper (Capsicum Frutescens L.) . metamorfosa 2026, 12 (2), 134-147. https://doi.org/10.24843/metamorfosa.2025.v12.i02.p4.