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Technical annual report 2000-01



Technical annual report 2000-01


Dept. of Regional Development, Primary Industry, Fisheries and Resources technical annual report; Department of Regional Development, Primary Industry, Fisheries and Resources technical and annual report; Reports; PublicationNT; Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295




Made available via the Publications (Legal Deposit) Act 2004 (NT).






Agriculture -- Northern Territory -- Periodicals; Fisheries -- Northern Territory -- Periodicals

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Dept. of Primary Industry and Fisheries

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Technical bulletin (Northern Territory. Dept. of Primary Industry and Fisheries) ; no. 295



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Technical Annual Report 2000/01 31 Table 2 shows survival and subsequent growth rates. It can be seen that some of the species performed poorly, indicating their unsuitability to conditions in Darwin. F. brayleana is a rainforest species more suited to the wet tropics of north Queensland and E. maculata, or spotted gum is better suited to the more temperate conditions of central NSW and southern Queensland. The other species are performing very well, particularly A. mangium, averaging over 7.2 m across all spacing treatments. Figure 2. December 1996 planting at BARC Figure 2 shows the nine best performing species in the trial and the growth rates across the three spacing treatments. A trend is beginning to emerge where the 1.5 m and 2.5 m spaced trees are gaining greater height than the 3.0 m spaced trees, as would be expected. In December 1997 a small tropical hardwood trial was established at Ranku on Bathurst Island in cooperation with Sylvatech which has an agreement with the Tiwi people to plant a 200 hectare pilot project. The Sylvatech project is concerned mainly with the fast growing Acacia mangium species for wood chip production. The DPIF trial is looking at high value hardwoods on the same site and has used species already in trials at DDRF and BARC. These include Cedrela odorata, Swietenia humilis (coma), Flindersia australis, Eucalyptus brassiana, Eucalyptus pellita, Eucalyptus camaldulensis, Swietenia macrophylla and Swietenia humilis (chol). The trees have been planted in three randomly allocated replications and spaced at 3 m x 3 m, giving a planting density of 1,111 stems per hectare. Data on this trial was taken only once, when it was six months old. The best performing species at that time were the three eucalypts. In December 1998, a trial similar to that described above was planted at Rolla Plains on Melville Island. The planting design was similar to that at Ranku the previous year, except that E. brassiana was unavailable and was replaced by Khaya senegalensis, (African mahogany). A teak (Tectona grandis) trial was established at DDRF to determine the success of the species on Blain soil, which was thought to be the most suitable for teak in the Top End. The trees were planted into ripped rows, 3 m apart in blocks of 5 x 5 at 2 m intervals, in three different treatments. The treatments were: Open root/shoots cut and roots trimmed (Stumped). Grown in 1-litre bags. Grown in Plantek trays 35. 0 2 4 6 8 10 12 14 Sa m an ea sa m an En te rlo biu m cy co Sw iet en ia hu m (c om a) A. au lac oc ar pa Gm eli na sc hle ch te ri A. a ur icu lifo rm is Sw iet en ia m ac ro . Sw iet en ia hu m (c ho l) A. m an giu m H ei g h t in m et re s 1.5 metres 2.5metres 3 metres Spacing