Mariani Sembiring, T. Sabrina and Mukhlis Mukhlis
University of Sumatera Utara, Faculty of Agriculture, Padang Bulan, Medan 20155, Indonesia
Sembiring, M., Sabrina, T. & Mukhlis, M. (2020). Phosphate solubilizing microbes and coffee skin compost to increase Robusta coffee plant growth in Andisol of Mount Sinabung Area. Bulg. J. Agric. Sci., 26 (4), 766–771
Coffee plants need high phosphorus nutrients for growth and fertilization. Andisol has a very low P availability which ranges from 1.17 to 2.54 ppm. The efforts that can be made to increase the availability of P are by the use of phosphate solubilizing microbes and coffee skin compost. The purpose of this research was to obtain the right type of phosphate solubilizing microbes and coffee skin organic matter in increasing the availability and growth of coffee plants on Andisol affected by the eruption of Mount Sinabung. This research used Factorial Randomized Block Design (RBD) consisting of 3 replications. Factor I: (Phosphate Solubilizing Microbes) M0 = without application, M1 = 6 g Burkholderia cepacia, M2 = 6 g Talaromyces pinophilus, M3 = 3 g Burkholderia cepacia + 3 g Talaromyces pinophilus. Factor II: Coffee Skin Compost, K0 = Without Coffee Skin Compost, K1 = 75 g, K2 = 150 g, K3 = 225 g and K4 = 300 g. Parameters observed were plant height, plant P content using spectrophotometry, plant N content using Kjeldahl titration method, plant K content using flame photometry and plant dry weight (g). The results obtained from the interaction of phosphate solubilizing microbes and coffee skin compost can increase plant height up to 35%, plant dry weight up to 32.17%. The best treatment for increasing plant growth is T. pinophilus combined with 150 g/plant coffee skin compost (M2K2).