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layering

 
Dictionary: lay·er·ing   (lā'ər-ĭng) pronunciation also lay·er·age
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(-ĭj)
n.
The process of rooting branches, twigs, or stems that are still attached to a parent plant, as by placing a specially treated part in moist soil.


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Britannica Concise Encyclopedia: layering
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Method of propagation in which plants are induced to regenerate missing parts from parts that are still attached to the parent plant. It occurs naturally for drooping black raspberry or forsythia stems, whose trailing tips root where they come in contact with the soil. They then send up new shoots from the newly rooted portion of the plant. For soil layering, lower stems are bent to the ground and covered with moist soil of good quality. For air layering, a branch is deeply slit and the wound is covered with a ball of earth or moss and kept moist until roots develop; the branch is then severed and transplanted. Layering was practiced by the ancient Egyptians and Greeks. See also cutting.

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Insurance Dictionary: Layering
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Combination of several policies with each adding an additional layer or limit of coverage above the limits of the policy that comes before it. For example, Policy A adds $100,000, then Policy B adds $200,000 and then Policy C adds $300,000, for a total of $600,000. In some instances a business firm cannot obtain the total coverage it requires from a single insurance company. Thus, the business may have to buy several policies from different companies in order to acquire the total needed.

 
Columbia Encyclopedia: layering
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layering, horticultural practice of propagating a plant by rooting a branch before severing it from the mother plant. Typically the branch is bent and a section that has been slit or broken on the underside is covered with soil and held in place by means of stakes or pins. Trench layering induces new shoots from a length of buried branch. In mound, or stool, layering, the many shoots of a closely cropped young plant are heaped with soil. Air (or pot, or Chinese) layering is used when the branch cannot be bent to the ground; peat moss or some other suitable rooting medium is attached to a cut place on the branch. Layering is used mostly for multiplying plants not easily propagated from cuttings. Some plants propagate naturally by layering, e.g., raspberries, strawberries, and chrysanthemums.

Bibliography

See bulletins of the U.S. Dept. of Agriculture; H. T. Hartmann, Plant Propagation (1968).

Gardener's Dictionary: layering
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Starting a new plant by fastening a stem down to the ground and partially covering it with soil to induce roots to develop. The rooted stem can later be removed and planted separately. See also air layering.

layering

 
 

 

Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Insurance Dictionary. Dictionary of Insurance Terms. Copyright © 2000 by Barron's Educational Series, Inc. All rights reserved.  Read more
Columbia Encyclopedia. The Columbia Electronic Encyclopedia, Sixth Edition Copyright © 2003, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/.  Read more
Gardener's Dictionary. Taylor's Dictionary for Gardeners, by Frances Tenenbaum. Copyright © 1997 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.  Read more