The length of time needed to produce orchids both in the laboratory and to produce mature flowering plants is an obstacle in the development of orchids. Generally, it takes a long time to get the first flowers from plants that are propagated. This study aims: 1) to determine whether BAP growth regulators can stimulate flowering and growth of Phalaenopsis orchid plants, 2) whether the influence of BAP zpt depends on air temperature, 3) get the best concentration to stimulate flowering and plant growth. The research was carried out at the Lampung State Polytechnic net house from June to August 2019. The research was a factorial experiment in a completely randomized design. As factor I is BAP concentration (0, 50,100,150, 200 mg / l) and factor II is night air temperature (26 / 180C and 32/260 C). There were 10 treatment combinations were tried, with 5 replications. Observed variables include data analyzed by analysis of variance, then followed by a 5% LSD test. The results showed: From the results of this study the following conclusions can be drawn: 1) BAP concentrations can significantly stimulate flowering (spike emergence) & height growth of Phalaenopsis orchid seedlings, and significantly affect leaf length and number of leaves; 2) The effect of BAP concentration interacts/depends on air temperature; 3) The number of spikes per plant is markedly better / more formed at normal temperatures. At normal temperatures, a good concentration of BAP in producing spikes is 100 mg / l, whereas at low temperatures the amount of spike is most when given the addition of BAP 50 mg / l; and 4) At normal temperature the BAP concentration that is good for seedling growth (seedling height, leaf length, leaf width, and number of leaves) is 100 mg / l, whereas at low temperatures BAP concentration is good for seedling growth (seedling height, leaf width, and the number of leaves) is 50 mg / l.


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