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Myung Min Oh, Young Yeol Cho, Kee Sung Kim, and Jung Eek Son

). Volumetric water content of medium was determined using the equation [(wet weight – dry weight)/volume] × 100%. To obtain the dry medium weight, wet media were dried for 24 h at 105 °C in an oven (FS-420; Advantec, Kashiwa, Japan) after the termination of the

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Amanda Bayer

growth and substrate volumetric water content (VWC) threshold for many ornamental plants, including ‘Panama Red’ hibiscus ( Hibiscus acetosella ), gardenia ( Gardenia jasminoides ), lantana ( Lantana camara ) ‘Siskiyou Pink’ gaura ( Gaura lindheimeri

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William K. Harris, Joyce G. Latimer, John F. Freeborn, Margaret Aiken, and Holly L. Scoggins

container-grown plants from damaging winter temperatures ( Smith, 2004 ). Several cultural factors, such as the use of substrate moisture content ( Smith, 2004 ), protective covers ( Perry, 1998 ), and fertility level ( Bilderback and Bir, 2007 ) have been

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Erin E. Gamrod and Holly L. Scoggins

Grown as an annual in most of the United States, Strobilanthes dyerianus Mast. has become increasingly popular in summer landscapes partially due to its superior performance in hot and humid conditions. At present, there is no published research on the nutritional requirements of S. dyerianus. Our study examined growth and foliar elemental response to different levels of fertilizer. Rooted cuttings were transplanted and grown with 0, 100, 200, 300, and 400 mg·L–1 N from 5N–2.2 P–12.4 K fertilizer as constant liquid feed. Plants were irrigated whenever the volumetric water content of the substrate was <20% as determined with a Theta Probe moisture meter. Weekly pH and electrical conductivity (EC) were monitored using the pour through method. Eight weeks after initiation of treatment, dry weight and leaf area was measured. Recently mature leaf tissue was analyzed for total N, P, K, Ca, Mg, S, Fe, Mn, B, Cu, Zn, and Mo. There were no significant differences in plant quality under the 100, 200, 300, or 400 mg·L–1 N treatments. The largest plants, based on leaf area and shoot dry weight, were produced with 200 mg·L–1 N. Compared to recommended EC levels for bedding plants, the treatments receiving 300 and 400 mg·L–1 N had excessively high levels of substrate soluble salts though overall plant quality was not reduced. The increase in fertilizer concentration yielded a linear increase in tissue concentration of N, P, and K and a linear decrease in tissue concentration of Ca and Mg.

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Bee Ling Poh, Aparna Gazula, Eric H. Simonne, Robert C. Hochmuth, and Michael R. Alligood

). Studies had found that more water was retained in the upper soil level when a lower emitter FR was used. Levin et al. (1979) observed higher soil moisture content and greater water retention in the 0–60 cm depth of a sandy soil at a lower FR of 1 L·h −1

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Anne M. Lockett, Dale A. Devitt, and Robert L. Morris

depths of 15, 45, 75, and 105 cm. Salinity sensor data were collected bimonthly using a salinity bridge (Model 5500; Soil Moisture Corporation, Santa Barbara, CA). Soil volumetric water content data were also collected bimonthly with a Trace System I

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George Kargas, Nikolaos Ntoulas, and Panayiotis A. Nektarios

water content in saline soils due to the overestimation of dielectric permittivity. The newly developed sensors received little or no attention regarding salinity effect on the estimation of permittivity, since it was implicitly assumed that these

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Kevin J. McInnes and James C. Thomas

the root zone profile, θ ( h ) is the functional relationship between volumetric water content and matric water tension (here approximated by the van Genuchten model), and h z 1 and h z 2 are the matric water tensions at vertical locations z 1

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Nisa Leksungnoen, Paul G. Johnson, and Roger K. Kjelgren

of the ambient air ( e l – e ). Volumetric soil water content (VWC) was measured in 2008 using a frequency domain reflectometry (FDR) sensor (Diviner 2000; Sentek Sensor Technologies, Adelaide, Australia). One-meter long polyvinyl chloride tubes were

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George Gizas, Ioannis Tsirogiannis, Maria Bakea, Nikolaos Mantzos, and Dimitrios Savvas

) in (1) renders: As previously mentioned, was measured, whereas was estimated by non-linear regression analysis to fit the measured data, as suggested by Raviv et al. (1999) . Eq. (3) was further used to calculate the volumetric water content at