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Product Information Richard E. Nicholls How do you mix your own fertilizer, and what does each nutrient do? What pH is the right pH? What is the difference between the Mittleider Method and the Bengal System? Richard E. Nicholls, The Plant Doctor, tells all in this guide to beginning hydroponics. Includes ist of resources, bibliography, index. 128 pp., softcover.  Tell a Friend about this item
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