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Investigating the Utilization of Potassium Fertilizer in a Pinus patula Schiede Ex Schltdl. & Cham. Plantation

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Previous research indicated that the application of phosphorus (P) and potassium (K) fertilizer to Mexican weeping pine (Pinus patula Schiede ex Schltdl. & Cham.) on gabbro-derived soils was necessary to correct a second rotation yield decline. To plan efficient fertilization of subsequent rotations, the fate and utilization of the applied K fertilizer was investigated using the rubidium (Rb)/K reverse tracer technique whereby the naturally occurring Rb in the soil was used as an indicator of native soil K. At the age of 15 years, samples from the soil, forest floor, bark, wood and live foliage were collected from a trial in which various amounts of P and K fertilizer were applied at different stages of stand development. No significant quantity of the applied K remained in the soil at the end of the 15-year rotation, but sufficient plant-available P remained on plots where 80 kg ha−1 P and K was applied. Significantly greater quantities of P per ha were found in the forest floor, wood, and foliage on the plots that received 40 or 80 kg ha−1 P and K compared with the control. The application of 80 kg ha−1 P and K increased the P content of the wood and foliage over that recorded in the 40 kg ha−1 P and K treatment. The application of 80 kg ha−1 P and K increased the K content of the forest floor and foliage compared with that of the control. Across all PK quantities, fertilizer K contributed 28, 17, and 8% to the quantity of K in the wood, bark, and foliage, respectively. The export of up to 52 kg K ha−1 from the site in wood and bark will necessitate the reapplication of at least 104 kg K ha−1 to the subsequent rotation to produce timber sustainably on the gabbro-derived soils at Usutu.

Keywords: Rb/K reverse tracer technique; fertilization; fertilizer recovery; nutrient export; nutrition; softwood plantations; sustainability

Document Type: Research Article

Publication date: 2011-06-01

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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