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Soilless Growing Systems: A Hydroponics Curriculum - Leader Guide Outdoor Exploration Curriculum Welcome to the world ofYouth will learn how to grow plants without soil, how the hydroponics industry has developed, the most common types of soilless growing systems, and advanced plant nutrition. Included also are activities related to conservation and limited resources and comparing and contrasting soil based and soilless growing systems. A purchase of the Leader Guide comes with a download of the PowerPoint training slides that may be used as part of instruction. This