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Development of the Shoot System of Young Loblolly Pine: 1. Apical Growth and Nitrogen Concentration

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The stem axis extended four flushes and elongated at a constant annual rate while the rate for branch axes accelerated. Much of the elongation occurred as currently formed second-order branches or elongation of existing branches. Third-order branches contributed little to apical growth by flushing only once. Shoot volume development during the fifth year was accelerating, with the largest increment occurring in the middle crown. The N concentration of foliage, wood, and bark was affected by season, flush, age of tissue, and crown position. Nitrogen concentrations (1) were highest for all parts in spring or when initiated, decreased in late summer, and usually increased in autumn and winter; (2) were highest in actively growing tissues (foliage, bark, or wood); and (3) decreased down the tree. These changes should be considered when sampling for tissue analyses. Forest Sci. 16:483-490.

Keywords: Foliar analysis; wood tissue analysis

Document Type: Journal Article

Affiliations: Agronomist, Mississippi Agr. Exp. Sta., State College

Publication date: December 1, 1970

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