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Wheat Response to Differences in Water and Nutritional Status between Zeoponic and Hydroponic Growth Systems

^a Lyndon B. Johnson Space Center, NASA, Houston, TX 77058 USA

View larger version (27K): [in a new window]   Fig. 1 Matric potential (P) as a function of water content () for 30% zeoponic/70% Profile substrate. The saturated hydraulic conductivity was 6.4 x 10-4 m s-1. Inset: Volumetric water capacity (d/dP) of the substrate as a function of matric potential and calculated pore size

View larger version (34K): [in a new window]   Fig. 2 Percentage of wheat biomass partitioned to roots and tillers (including stems, leaves, grain, and chaff) of different types for zeoponic substrate with microporous tube irrigation (ZPT) or hydroponic culture. Bars represent means; error bars indicate standard deviation (n = 4)

View larger version (31K): [in a new window]   Fig. 3 Water use of `USU-Apogee' wheat grown in zeoponic substrate with microporous tube irrigation (ZPT) vs. hydroponic culture for 64 d. Data were normalized on a treatment-area basis

View larger version (24K): [in a new window]   Fig. 4 Water potential gradients from substrate or hydroponic nutrient solution to roots and then leaves measured in the light (left) and water status of flag leaves in the light and dark (right). Dark measurements were made 4 h after lights had been turned off. Closed symbols represent hydroponic culture; open symbols represent zeoponic substrate with microporous tube irrigation culture (ZPT). Symbols represent means; error bars indicate SD, where larger than symbol size. Substrate and root water potentials, and nutrient solution osmotic potential, n = 3; leaf water potential, n = 6