The ecological relations of roots

Description:

Identifier: ecologicalrelati00weav (find matches)
Title: The ecological relations of roots
Year: 1919 (1910s)
Authors: Weaver, John E. (John Ernest), 1884-1966
Subjects: Roots (Botany) Plant ecology
Publisher: Washington, Carnegie institution of Washington
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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Text Appearing Before Image:
y of the branches is to pursue an almost horizontal course froma distance of a few inches to 2 feet and then turn almost vertically downward,penetrating the sand to a depth of 18 inches to 3 feet. A few of these branches,however, instead of taking this course, pursued an almost horizontal course totheir very tips, which were sometimes 3 feet from the tap. These laterals forthe first few inches of their course as they left the tap-root were very sparselybranched, the distance depending upon the size of the root. Beyond thatpoint the branches gradually became more numerous and as one approachedthe extremities the number was so great as almost to form a conspicuousnetwork in the fight sand. As the main laterals and their larger branchesapproached their lower extremities, the little rootlets were so numerous as toform fairly brushy tips. Below 3 feet the branches of the tap were muchfewer in number and much larger in size. As a rule they seem to occur in THE ECOLOGICAL RELATIONS OF ROOTS.
Text Appearing After Image:
Fig. 24.—Eriogonum microthecum.

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