Results 251 to 260 of about 62,088 (282)

Sound propagation through vegetation

Journal of Sound and Vibration, 1982
Abstract The propagation of sound through a large number of scatterers (i.e., trees) is treated in a similar way to a classical diffusion problem. A general differential equation governing the sound intensity is derived which is valid under certain conditions, notably that the depth of the belt of vegetation is large, and absorption small.
R. Bullen, F. Fricke
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Mass vegetative propagation

1994
Abstract Before 1960 the only genera of forest trees mass propagated for wood production by making rooted cuttings of superior individuals were Populus and Salix in temperate areas and Cryptomeria and Cunninghamia in subtropical areas.
Ken Eldridge, John Davidson, Chris Harwood, Gerrit Van Wyk   +3 more
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VEGETATIVE PROPAGATION OF HOLLY

American Journal of Botany, 1929
Propagation of hollies has been considered an important subject in recent years because of extensive ravages made upon these plants at Christmas time and also because of their growing popularity as ornamentals for home planting. Nurserymen have not been able to supply the demand for plants since seeds have germinated very poorly and cuttings have not ...
P. W. Zimmerman, A. E. Hitchcock
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Vegetatively Propagated Cultivars

1979
Plant varieties which have originated under cultivation are called cultivars (singular abbreviation cv.). They are of two principal types: (1) those which are mainly propagated vegetatively by division, cuttings, grafting, budding and nowadays sometimes also by rapid in vitro techniques, and (2) those which are mainly propagated by seed. Most perennial
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Regeneration and vegetative propagation

The Botanical Review, 1940
During the past decade remarkable strides have been made in the field of growth substances in general and in their practical application in various aspects of vegetative propagation. Anatomical and morphological studies appear not to have kept pace with more practical considerations.
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Vegetative Propagation of Eucalyptus

1982
At the present time, Eucalyptus is of increasing importance for timber and pulp and paper production throughout the world, and in plantations rates as one of the most productive forest crops. Species of Eucalyptus have been widely planted in South America, Africa, Asia, Spain, Portugal, Middle Eastern countries and North America (Fig. 1).
R. Durand-Cresswell, M. Boulay, A. Franclet   +2 more
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Vegetative Propagation of Daylilies

1937
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Horizontal propagation through periodic vegetation canopies

IEEE Transactions on Antennas and Propagation, 1991
Electromagnetic wave propagation through vegeta- tion media has traditionally been modeled using random-media volume scattering approaches, such as the radiative transfer technique. Although such techniques have proven suitable for natural vegetation covers, experimental data suggest that a semideterministic technique is needed to model certain man ...
A. Tavakoli, K. Sarabandi, F. Ulaby
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Vegetative propagation of orchids

1987
Orchids are propagated vegetatively as well as generatively. With vegetative propagation, the progeny is identical to the parent plants. However, with generative propagation (by seed), identical progency are rarely obtained, and then only when it concerns the wild species.
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Vegetative propagation

1991
Monteuuis, Olivier, Barneoud, C.
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