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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 2000/01 127 PROJECT: Improvement of Mango Production through the Manipulation of Flowering Project Officers: V. Kulkarni and D. Hamilton Location: CPHRF and Commercial Orchards Objective: To induce early and regular flowering to ensure early and consistent yields. To minimise any adverse effects of untimely and excessive vegetative growth. To develop a cost-effective high density planting system and a management strategy on a scientific basis. Experiment 1. Mango Flowering Project Background: This is a joint project with CSIRO and is being funded by the industry and Horticulture Australia. It is based on two treatments being developed to manipulate flowering in Kensington Pride. Firstly, the mango flowering treatment (MFT) initiated by CSIRO involves applying a cincture around the tree trunk and tying it with string soaked in a plant growth retardant called Morphactin. DPIF is developing the other treatment, the plant growth retardant Paclobutrazol (P) application to suit local conditions. Method: Ten commercial farms were selected throughout the Darwin and Katherine region. Each site consists of three treatments, Morphactin (M), Paclobutrazol (P) and Control (C). The M treatment was applied at the start of the trial, and does not need to be applied every year. The P treatment is applied every year of the trial in December at a rate determined for each tree depending on the size of the canopy surface area. Each treatment was applied to 50 trees, so the trial consisted of 150 trees in total. Measurements consist of leaf nutrient levels measured monthly, soil analysis twice per year- pre and post-harvest; leaf chlorophyll; percentage vegetative growth; percentage flowering; and total yield-average fruit weight and numbers, and fruit quality parameters. In addition, growers are supplying up-to-date information about their management inputs. Results: In 2000, the second year of the project, fortnightly observations of flowering during May-August indicated that the potential for fruit production was generally higher in the P treatment than in the M and C treatments (Figure 1). Harvest data confirmed that the greater flowering observed in P was reflected in greater numbers of fruit compared with the other two treatments, which were similar (Figure 2). There was little difference in average fruit weight between the treatments with fruit from all treatments being in the range of 0.51 0.55 kg. This project concludes in 2001. More detailed results will be provided later.