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Eugene K. Blythe and Donald J. Merhaut

The physical properties of container-growing substrates, particularly air space, container capacity, and bulk density, have a significant impact on plant growth, and knowledge of these properties is essential in properly managing nursery

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Magdalena Zazirska Gabriel, James E. Altland, and James S. Owen Jr

(1989) attempted to validate Eq. [1] . They found that linear relationships between measured and predicted properties of bark:sand and bark:perlite substrates were good for bulk density (D b ) but mixed or poor for other parameters such as total

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Craig Cogger, Rita Hummel, Jennifer Hart, and Andy Bary

Research in agricultural soils has shown benefits of incorporating organic amendments in improving soil physical properties, including reduced bulk density ( Foley and Cooperband, 2002 ; Tester, 1990 ), increased infiltration rate ( Cox et al

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Stephen C. Smith, Katherine M. Jennings, David W. Monks, David L. Jordan, S. Chris Reberg-Horton, and Michael R. Schwarz

system on otherwise conventionally managed sweetpotato. Thus, studies were conducted to determine the effect of production systems (reduced-tillage, high-residue rye cover crop mulch; conventional no mulch) on soil bulk density and moisture, and growth

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Michael R. Evans and Mary M. Gachukia

phytotoxic levels of one more mineral nutrients. Other materials evaluated as potential alternatives to perlite are either too expensive or have unacceptably high bulk densities (e.g., calcined clay aggregates, gravel), which resulted in unacceptably high

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Philip J. Brown, Lambert B. McCarty, Virgil L. Quisenberry, L. Ray Hubbard Jr., and M. Brad Addy

with native soil and vice versa, pore spaces in both soil sources can become compromised. Macropores in sand can be filled by finer soil particles, reducing porosity, increasing bulk density, and reducing necessary water movement through the profile

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Michael R. Evans and Leisha Vance

-filled pore space, water-filled pore space, water-holding capacity, and bulk density of sphagnum peat-based substrates amended with feather fiber. The substrates were air-dried in a greenhouse at 32 to 35 °C until they no longer lost weight over a 24-h period

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Michael A. Fidanza, David L. Sanford, David M. Beyer, and David J. Aurentz

) were calculated from P 2 O 5 and K 2 O, respectively ( Brady and Weil, 1996 ). Two additional laboratory tests measured bulk density and particle size distribution. Laboratory test methods and procedures are based on the Test Methods for Evaluation of

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Guihong Bi, Williams B. Evans, and Glenn B. Fain

); increase EC ( Chirenji and Ma, 2002 ); and increase waterholding capacity and reduce soil bulk density of a fine sand ( Chirenji and Ma, 2002 ). Although some studies have demonstrated that ash applications have negative or no effects on plant growth

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Panayiotis A. Nektarios, Serafim Kastritsis, Nikolaos Ntoulas, and Panayiota Tsiotsiopoulou

. Urea formaldehyde resin foam (UFRF) is produced by inflation of a resin with the addition of urea and formaldehyde. This foam has a porous structure and has the capacity to absorb water (up to 60% v/v) depending on the bulk density of the final product