7Van Os E A, Benoit F. State of art of the Dutch and Belgian greenhouse horticulture and hydroponics[J].Acta Horticulturae, 1999, 481:765-767.
8Van Os E A, Gieling Th H, Ruijs M N A. Equipment for hydro- ponic installations [C] // Savvas D, Passam H C. Hydroponic Production of Vegetables and Ornamentals. Embryo Publications, Athens, Greece, 2002:103-141.
9De Boodt M, Verdonek O. The physical properties of the sub- strates in horticulture[J].Acta Horticulturae, 1972,26 : 37-44.
10Uva W L, Weiler T C, Milligan R A. A survey on the planning and adoption of zero runoff subirrigation systems in greenhouse operations[J].HortScience, 1998, 33 : 193- 196.