IJSRP, Volume 6, Issue 5, May 2016 Edition [ISSN 2250-3153]
Dr. Eric Randy R. Politud, Ph.D. and Barney Avako
Mass propagating robusta coffee through shoot cuttings using naphthalene acetic acid (NAA) is an innovative practice to hasten and mass produce planting materials of coffee for commercial production. A study was conducted to determine the performance of Coffea conephora in response to different levels of NAA using shoot cuttings under a rooting chamber condition with five treatments and four replications in a Completely Randomized Design (CRD). The different treatments were: T0 (Control, 0 ppm NAA), T1 (50 ppm NAA), T2 (100 ppm NAA), T3 (150 ppm NAA) and T4 (200 ppm NAA). Robusta shoot cuttings dipped in 100 ppm NAA (T2) and grown under clonal chamber performed best with the most number of leaves (2.38), most number of shoots (1.65), highest percentage of rooting success (78.56%), least percent mortality (3.5%) and the highest ROI (231.12%). The most number of roots was also obtained in T1 (50 ppm NAA) with 1.13, while the tallest shoot (2.22 cm) and the longest root (15.31 cm) were produced in T3 (150 ppm NAA) with the control treatment (T0) performing poorly. Thus, dipping coffee shoot cuttings between 100 to 150 ppm NAA in the clonal chamber could enhance excellent root and shoot growth of the cuttings as well as the ROI. However, cuttings dipped above 150 ppm NAA had declining shoot and root growth performance. Hence, recommended for mass propagation of Robusta coffee for a short period of time.