Our "hothouses" are two domes - with metal frames, covered in heavy plastic. Each end is enclosed with an open weave fabric. The plants grow on shelves each with their own irrigation spike that delivers measured amounts of water and nutrient and water at specific times. We can calculate exactly how much each plant receives. Large growers have much more sophisticated hothouses - with computers which collect data and automatically change the atmosphere, or water and nutrient usage based on the data collecated. Ours, is a much more unsophisticated operation - we monitor things ourselves and manually make changes to things.
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