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Bench space in greenhouses is a valuable resource. A structural bench space optimization according to the properties of the greenhouse and the grown crop is essential for a successful operation. The model presented here differs from the current set up at CHSR and approaches an optimal bench setting. Figure 3 shows a possible optimal setup arrangement for lettuce production in the Poly-Tex greenhouse. Figure 3: An Optimal Setup for Hydroponic Lettuce Production Using hydroponics, the lettuce seeds are started in rock wool sheets. In the model each sheet can hold 50 seeds. A sheet of 50 2" x 2" x 2" cubes costs $8.00. Therefore the total costs for the rock wool sheets are $25,000 per year, assuming 400 to 450 seeds are started per day. The price of the seed varies with the type of lettuce grown in the greenhouse and is estimated on the upper end of the price range at $110 for 50,000 seeds (JOHNNY 07). The plants stay in the sheet system for the first 7 days of growing (Figure 4). After 7 days they are moved into the hydroponic growing system in the greenhouse. There the plants are spaced 8 inches apart and complete their growth. 7PDF Image | ECONOMICS OF GREENHOUSE PRODUCTION IN ALASKA
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