INTRODUCTIONOrchid is the most attractive ornamental plant because it has a variety of shapes and colours, distinctive flavour, and it is quite durable in room condition. Nowadays, orchids often used as decorative flowers and potted plants that have become a flower industry in the world (Mirani et al., 2017). One of Orchid species that has top selling price and quite popular is Dendrobium sylvanum Rchb. f (Iswanto, 2001).Orchid can't uptake nutrient significantly from root so foliar nutrient application is very widespread practice in orchid cultivation (Monda et al., 2014). Dendrobium orchid has very low growth rate.
Abstract. There are so many benefit of algae. One of them is using for renewable energy and sustainable in the future. The greater growth of algae will increasing biodiesel production and the increase of algae growth is influenced by glucose, nutrients and photosynthesis process. In this paper, the optimal control problem of the growth of algae is discussed. The objective function is to maximize the concentration of dry algae while the control is the flow of carbon dioxide and the nutrition. The solution is obtained by applying the Pontryagin Maximum Principle. and the result show that the concentration of algae increased more than 15 %.
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