Abstract
Abstract: In order to assess the nutrient sustainability of teak plantations, a study was conducted to measure the amount of nutrients accumulated by the trees and exported during wood harvest. Three teak plantations (28 stands of different age) were studied in Costa Rica and Panama to assess those questions. Nutrient and biomass accumulation and allocation in different tree components (bole, bark, branches and foliage) were measured in the best performing trees between 1 and 19 years of age. A stand of 150 teak trees ha-1 at age 19 would accumulate (kg ha-1) 405 N, 661 Ca, 182 K, 111 Mg, 33 P, 53 S, 9 Fe, 0.47 Mn, 0.22 Cu, 0.92 Zn, 1 B; whereas the expected nutrient export by timber harvest (bole and bark) is (kg ha-1) 220 N, 281 Ca, 88 K, 63 Mg, 23 P, 39 S, 6 Fe, 0.13 Mn, 0.10 Cu, 0.21 Zn, 0.40 B. Hence, teak nutrition should pay special attention to N and K, together with Ca the nutrients most accumulated by teak. In addition, P and B could also be limiting planted teak forest productivity due to their general soil deficiencies. Proposed models estimate the amount of nutrients removed from the site during timber harvests, information that can be used by plantation managers to avoid soil nutrient depletion, approaching sustainability in forest plantation management.
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