Nurdin Sitohang, Erwin M. Harahap, Chairani Hanum, Tumpal H. S. Siregar, Hasril Siregar
Background and Objective: Balanced N.P.K.Ca.Mg fertilizing is important to be applied to improve high yield on cocoa productive. The research was focused on the influence of balanced N.P.K.Ca.Mg fertilizing formula on flushing, flowering and pod production of productive cocoa TSH 858 clone, to determine the better fertilizing formula. Methodology: It used non-factorial randomized block design with six formula (F) treatments of balanced N.P.K.Ca.Mg fertilization: (F1) 13.7: 11.0: 13.8: 4.4 as control; (F2) 12.5: 10.9: 16.4: 10.3: 4.6; (F3) 12.9: 11.4: 16.8: 10.6: 4.6; (F4) 13.4: 9.1: 17.4: 8.6: 3.9; (F5) 13.8: 9.4: 18.0: 8.7: 3.9; and (F6) 13.9: 5.0: 18.9: 6.2: 5.1. For 52 weeks, the observed parameters were the number of flushes, the size of flush leaves, dry weight of litter (decayed leaves), dry weight of water sprouts, the number of flowers, the number of pods, the number of normal pods, the volume of pods, bean weight pod-1 and weight of each bean in every month. Result: The result of the research showed that balanced N.P.K.Ca.Mg fertilizing formula influenced the number of flushes, flowers, pods and weight bean-1. Conclusion: Balanced N.P.K.Ca.Mg fertilizing formula 12.9: 11.4: 16.8: 10.6: 4.6 (with the dosage 206.4 g N, 182.4 g P2O5, 268.9 g K2O, 75.1 g CaO and 33.8 g MgO tree-1) showed the best results with the number of flush 377.3 sheets, 748.1 flowers and 64.9 pods production within 52 weeks. It is recommended that the next researchers investigate further to determine of applicable right dose. © 2020 SERSC.
Faculty of Agriculture, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia; Faculty of Agriculture, Universitas Sumatera Utara, Padang Bulan, Medan, 20155, Indonesia; Sungei Putih Research Center, Sungei Putih-Galang Sumatera Utara, P.O.Box 1415, Medan, 20001, Indonesia; Indonesian Oil Palm Research Institute, Jl. Brigjen Katamso No.51, Medan, 20158, Indonesia; Faculty of Agriculture, Universitas Katolik Santo Thomas, Jl. Setia Budi No.479-F, Medan, 20132, Indonesia