The experiment for the diploma thesis started on February 22, 2019. At that time, we planted orchid plants of the variety 'Anthura Cambridge' from the genus Phalaenopsis in three different substrates (Ocean orchid substrate, peat substrate and mixed mix substrate). During the growing season, we monitored various parameters of plant growth and development and recorded them in tables. We monitored rosette length, rosette width, number of leaves, rosette neck height, weight of wet and dry substrate, flower stem increment length, and number of flowers. From the obtained results, we then calculated the average values and standard deviation for individual substrates. We also calculated the proportion of water. We undertook the experiment in order to determine in which substrate the plants thrive best. We expected the plants in the peat substrate to thrive best. Towards the end of the experiment, almost all the plants bloomed. We observed a significant difference in the size and growth of the plants themselves. Orchids growing in a mixed substrate were the smallest. On average, they had the smallest rosettes, an average of 4 leaves, flower stalks 20 cm long and the fewest flowers. Orchids had the largest increase in 'Ocean orchid' substrate and peat substrate, which also had the most flowers. The average lengths of the flower stalks were around 30 cm and they had 5 - 6 leaves and 3 - 5 flowers. The plants bloomed until November, after which they experienced a slight shock due to the outside temperatures. We also monitored the growth of lateral flower stalks and found that the fewest flower stalks developed in the mixed substrate (mix). Despite the fact that all the plants grew successfully, there were still differences between the substrates. In general, the best results were observed in plants in peat substrate and 'Ocean orchid' substrate, and the worst in the substrate mixture.
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