Pengaruh Jumlah Ruas Entres dan Konsentrasi IBA terhadap Keberhasilan Sambung Samping Kopi Robusta (Coffea canephora)

Oleh :
Adriyan Widya Gutama - H0722003 - Fak. Pertanian

National coffee productivity has declined due to aging plants, low varietal uniformity, and limited application of adaptive cultivation technologies. Grafting through the side grafting method is an alternative for variety improvement without replacing entire plants. This research aimed to determine the interaction effect between the number of scion nodes and IBA concentration on the success of side grafting of robusta coffee. The research was conducted in a coffee plantation in Ternadi Village, Dawe District, Kudus Regency, Central Java at an altitude of 700 meters above sea level from August to November 2025. The method used was a factorial Randomized Complete Block Design (RCBD) with two factors and three replications. The first factor was scion node number (1; 2; and 3 nodes). The second factor was IBA concentration (0; 100; 200; and 300 ppm). Parameters observed included shoot emergence time, shoot length, shoot diameter, leaf number, and grafting success percentage. Data were analyzed using analysis of variance at 95% significance level, if signnificant then followed by Duncan’s Multiple Range Test at 95% significance level. The results showed that significant interaction effects on shoot emergence time, shoot length, and number of leaves. The combination of 3-node scions without IBA or with 300 ppm IBA produced the fastest shoot emergence (17.5 days), while 100 ppm IBA inhibited shoot initiation (33.8 days). Three-node scions exhibited the highest success rate (75%). The overall grafting success rate reached 47.2%.Keywords: auxin; cuttings viability; grafting; Rubiaceae; shoot length.