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John J. Sloan, Raul I. Cabrera, Peter A.Y. Ampim, Steve A. George, and Wayne A. Mackay

diffuse out of those pores when the expanded shale aggregate is again surrounded by water ( Sloan et al., 2000 ). This property could make expanded shale a beneficial ingredient of growing media, especially when combined with decomposable organic materials

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Jean-Charles Michel

Most growing media have a more or less pronounced hydrophobic character in relation to their moisture level ( Michel et al., 2001 ). To remedy this, the addition of mineral materials or wetting agents has been proposed. However, the influence of

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Yinping Li, Raymond A. Cloyd, and Nora M. Bello

media, 2) the effect of pyriproxyfen in two growing media on western flower thrips pupae, and 3) the residual activity of pyriproxyfen in growing medium on western flower thrips pupae 3, 5, 7, and 14 d after treatments were applied. Materials and Methods

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Samuel E. Wortman, Michael S. Douglass, and Jeffrey D. Kindhart

, both of these challenges can be at least partially addressed by growing strawberries in a hydroponic system within high tunnels. Hydroponic production, through the use of nutrient solution or soilless substrates as growing media, eliminates weed

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Hanna Y. Hanna

increase plant yield to gain a fair market share among major producers. Previous research has indicated that perlite growing media can be recycled to save money ( Hanna, 2005 , 2006 ), and precision heating can reduce production costs ( Hanna and Henderson

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Nadia Jiménez-Peña, Luis A. Valdez-Aguilar, Ana M. Castillo-González, María T. Colinas-León, Andrew D. Cartmill, and Donita L. Cartmill

nutrients in the media solution and the physical and chemical properties of the growing media may affect the response of plants to a specific substrate and nutrient solution formulation. Tree bark is a traditionally used media for orchid cultivation in

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Sarah B. Everhart, Kathryn K. Fontenot, Edward W. Bush, and Charles E. Johnson

December to February and increased in March and April ( Fig. 1 ). The increase in precipitation during the second planting replication may have affected media treatments growing on the nursery yard. During the second planting replication, medium treatment 1

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Nathan J. Herrick and Raymond A. Cloyd

). However, there are unsubstantiated allegations made by a manufacturer that certain plant-growing media containing B. pumilus and an arbuscular mycorrhizal fungus, Glomus intraradices , negatively affect the survival of western flower thrips pupae and

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Bruce R. Roberts, Henry F. Decker, Lindsey M. Ganahl, and Elizabeth Yarmark

Two biosolid-containing waste media [composted sewage sludge (Com-Til) and incinerated biosolids (flume sand)] were evaluated as soilless media for growing `Crenshaw', `Penncross', and `ProCup' creeping bentgrass sod (Agrostis palustris). The media were combined with sand and either sphagnum peat or a commercial growing mix (Metromix) and leached with 5.1 fl oz (150 mL) tap water either zero, one or three times before seeding. Leaching with tap water to remove soluble salts had no beneficial effect on germination or dry mass accumulation. Flume sand was not a particularly good rootzone component for growing creeping bentgrass sod; however, a sieved [0.08-inch (2-mm)] medium consisting of sand, Com-Til and Metromix (8:1:1, by weight) seeded with `ProCup' creeping bentgrass at 2 lb/1000 ft2 (9.8 g·m-2) and grown over 4-mil (0.004-inch, 0.10-mm) plastic in 3.5 × 7.5 × 2-inch deep (9 × 19 × 5-cm) trays produced good sod in about 6 weeks.

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Krishna Nemali* and Marc van Iersel

Monitoring moisture status of the growing medium is essential as growth and quality of greenhouse crops largely depend on the amount of available water. Recently, two new types of moisture sensors have been developed (ECH2 O, Decagon devices, Inc., Pullman, Wash.; Theta probe ML2X, Delta -T devices Ltd., Burwell, Cambridge, U.K.). We studied the performance of these sensors for measuring the volumetric water content (VWC) of a soilless growing medium. We also tested the sensitivity of these sensors to temperature and electrical conductivity (EC) of the growing medium. Our results indicate that these sensors can be calibrated and used effectively for measuring a wide range of moisture contents in the growing medium; however media specific calibration may be required. Regression analysis indicated that the output of ECH2 O probes was affected by changes in the EC and temperature of the growing medium. Effects of EC were too small to be of practical significance, while the measured VWC increased by 0.003 m3/m3 for each °C increase in temperature. The output from the Theta Probe was not affected by changes in the EC or temperature of the growing medium. In a comparison study, both probes were found to give similar estimates of the VWC of the growing medium within the common range seen under greenhouse production.