This is one of the best books available on the subject of hydroponic gardening and a Progrow favourite. A must for the serious hydro gardener and highly recommended.
This book will teach you by quick and simple reference
How a plant works in detail
How each plant hormone affects growth
Easy cuttings and rooting methods
Well kept trade secrets on growing
Plus get answers to
Why the wrong pH can harm plants
Why plants need oxygen
Why its is better to add carbon dioxide
Why various light bulbs give different plant yields.
A4 137 pages