Aplikasi mikoriza dan plant growth-promoting rhizobacteria untuk meningkatkan pertumbuhan morfologi tanaman kopi Liberika

Authors: Elis Kartika,Lizawati Lizawati, Made Deviani Duaja, Gusniwati Gusniwati

Abstract

The development of Liberica coffee on Ultisol is a strategic alternative to support agricultural extensification and sustainability in Indonesia. However, the low fertility, acidic reaction, and limited nutrient availability of Ultisols constrain plant growth and productivity. Biological approaches such as mycorrhiza and Plant Growth-Promoting Rhizobacteria (PGPR) are potential solutions to improve nutrient uptake and enhance plant vigor. This study aimed to evaluate the interaction effects of mycorrhiza and PGPR on the morphological growth of Liberica coffee in Ultisol. The experiment was arranged in a factorial Randomized Block Design (RBD) with two factors: (1) mycorrhizal inoculation (with and without mycorrhiza), and (2) six levels of PGPR concentration(0, 30, 60, 90, 120, and 150 mLL-1). One-year-old Liberica coffee seedlings produced through intraspecific grafting were used. Growth parameters observed included plant height, leaf number, stem diameter, branch number, leaf area, and mycorrhizal infection percentage. Data were analyzed using analysis of variance and Duncan’s Multiple Range Test at the 5% level. The results indicated that mycorrhiza and PGPR acted synergistically to enhance morphological growth of Liberica coffee in Ultisol. The best morphological growth was obtained with mycorrhiza combined with 60 mL L-1 PGPR, while in the absence of mycorrhiza, the highest morphological growth was achieved at 120 mL L-1 PGPR.Keywords:Biofertilizer, Liberica Coffee, Morphology, PGPR, Ultiso