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Fertilization of Pinus pinaster on a lateritic gravelly soil with urea and superphosphate increased the size of current needles and their nitrogen and phosphorus concentrations within 6 months of application. Girth increments after 18 months were increased up to threefold. The photosynthetic ability of needles up to 5 years old was increased, although the effect was greatest in 1- and 2-year-old needles. This effect was associated with higher concentrations of nitrogen, phosphorus, chlorophylls 'a' and 'b', and moisture in the needles. Stem growth during the dry summer was maintained at a constant rate, whereas in untreated trees stem growth ceased for the 2 hottest months.
Document Type: Journal Article
Members of the staff of W. A. Laboratories, Commonwealth Sci. and Industrial Res. Organ., Australia
Publication date: December 1, 1968
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Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.