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Biomass of Pinus Resinosa in Relation To Potassium Nutrition

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Nineteen plots ranging in tree age from 29 to 32 years and comprising part of an extensive fertilizer trial on a potassium-deficient site were examined. The most recent potassium additions were made at least 12 years earlier, and a period of stable growth response reached. Net annual bolewood accumulation per hectare in potassium-deficient stands varied from 1.47 metric tons at 2000 stems/ha to 0.84 metric tons at 10,000 stems. Near optimum potassium additions increased net annual bolewood accumulation by 2.7 metric tons/ha. Net annual bole bark accumulation per hectare was 0.23 metric tons in potassium-deficient stands and an additional 0.43 metric tons in potassium-treated plots. Increased branch production following additions of potassium was offset by earlier mortality so that branch biomass was approximately constant irrespective of potassium status. Annual needle production varied from year to year but was not affected by potassium supply. Loss of potassium-deficient needles occurred mainly in the third and fourth years. Stands with added potassium kept needles for about an additional year and carried a total needle mass 2.9 metric tons/ha greater than potassium-deficient stands. Increased stocking significantly decreased stand biomass of 1-year-old needles, total needles, and live branches. Forest Sci. 16: 154-159.

Keywords: Height growth; needle longevity; needle mass

Document Type: Journal Article

Affiliations: Professor of Silviculture, State Univ. Coll. of Forestry at Syracuse

Publication date: 1970-06-01

More about this publication?
  • 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.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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