Investigate the importance of nutrients for plant growth and discover how plants grow without soil. Use this kit to grow and observe plants in a test tube hydroponic system. Kit includes rock wool, seed-starter trays, soybean seeds, plant tags, test tubes, and pipettes for 35 students. The Test Tube Hydroponics Kit complements the lesson Test Tube Hydroponics. Order this kit online from agclassroomstore.com.