Abstract
Liberica, Robusta and Excelsa coffee are cross-pollinated so that their vegetative propagation uses cuttings. Plant growth regulators (PGR) such as Rootone-F could accelerate root growth on cuttings. The study aimed to determine the effect of Rootone-F concentration on the growth of one segment cuttings. The study was conducted at the Indonesian Industrial and Beverage Crops Research Institute (IIBCRI) from January to March 2020. The research design was a factorial, Completely Randomized Design, with three replications. The first factor was coffee species, i.e., Robusta (BP 936), Liberica (LIM 1 and LIM 2), and Excelsa, and the second factor was Rootone-F concentrations were 0, 100, 200, 300, 400, and 500 ppm. The characters observed were callus diameter, leaves number, shoots number, and leaf length. The results showed there was an interaction between coffee species and Rootone-F concentration on shoots number and leaf length. Every factor affected callus diameter and leaves number, respectively. Application without Rootone-F (0 ppm) gave a higher value of callus diameter and leaves number of LIM 1. Rootone-F concentration that could increase the shoots number and leaf length was 500 ppm for Lim 1, 400 ppm for Lim 2, 0 ppm for BP 936, and 100 ppm for Excelsa.
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