Growth, yield and wood properties of teak (Tectona grandis) provenances at longuza forest plantation, Muheza District, Tanzania

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Sokoine University of Agriculture


A comprehensive study was conducted at Longuza Forest Plantation in Tanzania to enhance the production of Teak (Tectona grandis) in response to increasing demand for improved Teak provenances for productive plantations. The study aimed to evaluate the growth performance and wood properties of 12 provenances established in 2011, comprising 41 families. The experiment used a randomized complete block design with 8 replications, each plot containing 6 trees. The growth performance assessment included survival, diameter at breast height (Dbh), height (Ht), basal area (BA), volume (Vol), and mean annual increment (MAI). Additionally, the study examined stem straightness and the physical properties. Statistical analysis was carried out using SAS® software version 9.4, NPAR1WAY and rank procedures. The results showed non- significant differences (p > 0.05) in survival among provenances but highly significant differences (p < .0001) for Dbh, Ht, Vol, BA, and MAI, the average values for these parameters were 68.70 ± 5.64 %, 21.35 ± 4.04 cm, 18.65 ± 2.2 m, 304.83 ± 135.37 m3 ha−1, 9.96 ± 3.60 m2 ha−1, and 27.71 ± 12.30 m3 ha−1 yr−1 respectively. The study identified superior performing provenances, including the East Africa Longuza seed stand, East Africa Longuza Provenance Trial, and East Africa Longuza Progeny Trial. Furthermore, the results revealed significant variation in stem straightness among provenances with the average score of 1.9 ± 0.8. Provenances like East Africa Mtibwa, CSIRO Thailand, and East Africa Longuza seed stand showed superior stem straightness. However, no substantial variations in physical properties were observed among the provenances. The average basic density was 0.571 ± 0.059 g cm−3, with mean ranging from 0.469 ± 0.053 in CSIRO Thailand to 0.545 ± 0.071 g cm−3 in East Africa Longuza Progeny Trial. Based on the findings, the study recommends planting East Africa Longuza seed stand, East Africa Longuza Provenance Trial, and East Africa Longuza Progeny Trial in pilot plantations at Longuza and in areas with similar climatic and soil conditions. Furthermore, the study


Master Degree of Science in Forestry


eak, Family, Provenance, Survival, Growth, Wood quality