Author： Pearson G. A.
Publisher： Society of American Foresters
ISSN： 0022-1201
Source： Journal of Forestry, Vol.32, Iss.5, 1934-05, pp. : 545-555
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Abstract
Early studies of ponderosa pine reproduction in the Southwest emphasized the value of protection to young seedlings against sun, wind and cold. Shade by trees, grass, logs and other objects was thought to be beneficial, if not indispensable. Later, the idea was advanced that such benefits as are derived from cover operate mainly through soil improvement, and that shelter of the seedlings themselves is rarely needed or may be positively harmful. The information presented in this article supports the latter viewpoint.
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