| Pak. J. Bot., 41(6): 3023-3034, 2009. | Back to Contents | ||||
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Updated: 14-01-10 | ||||
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CHRONOSEQUENCE AND CROWN STRATA EFFECTS ON FOLIAR NUTRIENT CONCENTRATIONS IN TEAK (TECTONA GRANDIS L.f) PLANTATIONS
M. TAHIR SIDDIQUI, A.H. SHAH AND S. YAQOOB
Abstract: Foliar nutrient concentrations, fertilizer and variation with crown location and tree age were quantified in 1, 2, 10 and 18-year-old teak plantations in Peninsular Malaysia. Concentrations of N, P and K decreased with tree age, while the concentration of Ca increased. Nitrogen concentration was same in 1 and 2-year old plants (1.9%) and decreased as tree progressed in age i.e., 1.6% in 10-year old and 1.4% in 18-year old trees. Phosphorus, K and Zn followed the similar trend, however, Ca, Mg, Mn and Cu increased with increase in tree age. Concentrations of P and K were greatest in the upper tier of the crown. Differences in N concentration among crown strata were small while Ca and Mg concentrations decreased with crown height. Our results suggest that sampling of teak leaves should be carried from the upper or middle crown positions for N, P, K and from the lower crown position for Ca, Mg, Mn and Cu.
Department of Forestry, University of Agriculture, Faisalabad, Pakistan |
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