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Marco Bittelli

Soil water content has an important impact on many fundamental biophysical processes. It affects the germination of seeds, plant growth and nutrition, microbial decomposition of the soil organic matter, nutrient transformations in the root zone, as

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Peter Alem, Paul A. Thomas and Marc W. van Iersel

; Delta T Devices, Cambridge, U.K.). This probe measures bulk EC, the dielectric permittivity of the substrate (a proxy for water content), and substrate temperature to calculate pore water EC ( Hilhorst, 2000 ). Leaf chlorophyll index was measured twice

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Shuyang Zhen and Stephanie E. Burnett

fertilizer applications because of reduced fertilizer waste, and have increased profitability. Fig. 1. Daily average substrate volumetric water content (θ = volume of water ÷ volume of substrate) throughout the experimental period for ‘Munstead’ ( A ) and

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Yong Ha Rhie, Seonghwan Kang and Jongyun Kim

substrate/soil water content has been examined for several species, ranging from woody species, such as Rhododendron spp. ( Lea-Cox et al., 2008 ) and Hydrangea ( van Iersel et al., 2009 ), to herbaceous species, such as Petunia ( Kim et al., 2011

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Whitney N. Griffin, Steven M. Cohan, John D. Lea-Cox and Andrew G. Ristvey

the additional ecosystem service of storm water removal via transpirational water loss. In this way, water held in the GRS is taken up through the roots and cycled directly back into the atmosphere as water vapor, decreasing the water content of the

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Bryan J. Peterson and William R. Graves

Numerous woody genera are distributed in both eastern North America and in portions of California with the dry summers of Mediterranean climates. Such genera may harbor substantial variation among congeners in response to soil water content. During

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A. A. Gardea, P. B. Lombard, R. L. Kohnert, A. N. Azarenko, Y. M. Moreno and L. S. Daley

Changes in water content of `Pinot Noir' endo- and ecodormant primary buds were gravimetrically partitioned into extracellular (ECW) and intracellular water (ICW). During endodormancy, water status remained unchanged with values of 0.6 and 0.1 mg/mg dw for ICW and ECW, respectively. Ecodormant buds, prior to budbreak, increased in ICW from 0.5 to 4.4 mg/mg dry weight for Jan. and Apr., respectively. Liquid water in the buds was determined by H-NMR. The spin-spin relaxation time (T2) at -30C represented the bound fraction, which peaked in Jan. at 0.3 mg/mg dw followed by a decrease to 0.2 mg/mg dw in March. During the dormant season the free fraction was always larger than the bound fraction. No vascular connection between bud and stem was observed by mid Jan. Changes in bound water indicated that there is a transient fraction changing to the free form. These changes were not strictly related to the bud's dormancy status.

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Gabriele Amoroso, Piero Frangi, Riccardo Piatti, Alessio Fini and Francesco Ferrini

around the stem of the plant. Two irrigation levels and two weed management methods were also carried out during the trial. Irrigation was carried out daily to maintain water content of the container at 100% [normal water (NW)] or 30% [reduced water (RW

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Yiwei Jiang, Huifen Liu and Van Cline

for enhancing turf performance during periods of drought stress and for conserving water. Determining plant and soil water content in response to water deficit conditions is beneficial for turfgrass site-specific irrigation management, particularly for

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Sanjit K. Deb, Manoj K. Shukla and John G. Mexal

gained wide acceptance because many features of the plant’s physiology respond directly to changes in water status in the plant tissues rather than to changes in the bulk soil water content (or potential) ( Jones, 2004 ). Direct physiological methods