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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 2000/01 103 Figure 2. Cumulative harvest (four plants per replicate) Harvest of all varieties commenced at eight weeks from planting and peaked at 11-12 weeks (Figure 1). This is more distinct with the hybrid lines and is most likely the initial fruit set on primary lateral branches. Further smaller peaks in the harvest would come from the flowering of secondary lateral branching. This trend in flowering and fruiting was also evident in yield figures from another trial promoting improved farming systems on bitter melon and reported in this TAR. Both hybrids had very similar cumulative yields throughout the trial (Figure 2). The local selection had lower yields early but by week 17, total cumulative yield was not significantly different from the hybrids. Fruit that ripened on the plant before reaching a marketable size was not included in yield figures. Poor pollination or early injury to fruit can cause early ripening, but is also noted as a varietal characteristic. These fruit were recorded and the data presented as a percentage of total fruit harvested. Known you green 12.1% Moonlight 10.8% Local selection 18.4% Observations: Bitter melons are harvested at the mature green stage of development before the onset of ripening. This is an essential market requirement, but is difficult to determine at harvest. Even fruit showing no external colour change may have commenced ripening within the seed cavity. If packed, such fruit will continue to ripen in transit with the production of ethylene causing ripening of the whole box. Regular internal checks of harvested fruit showed that this problem was common in all varieties. There were obvious differences in fruit uniformity between the hybrids and the open pollinated line. As expected, both hybrids produced very uniform fruit with size, shape and colour remaining constant over the harvest period. While fruit size (weight) of the local selection was fairly consistent, the shape and colour of the fruit was quite variable. This is a common problem for growers. Because growers collect seed from their own crops, the quality of open pollinated fruit can vary between farms. Limited market studies show 0 20 40 60 80 8 9 10 11 12 13 14 15 16 17 Weeks from planting Y ie ld ( kg ) Known You Green Moon Light Local Selection